{"id":11807,"date":"2026-07-29T03:38:11","date_gmt":"2026-07-29T03:38:11","guid":{"rendered":"https:\/\/michemicals.com\/?p=11807"},"modified":"2026-07-29T03:44:19","modified_gmt":"2026-07-29T03:44:19","slug":"%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82-%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b8-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d0%b4%d0%bb%d1%8f-%d0%b3%d0%b8%d0%bf","status":"publish","type":"post","link":"https:\/\/michemicals.com\/ru\/%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82-%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b8-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d0%b4%d0%bb%d1%8f-%d0%b3%d0%b8%d0%bf\/","title":{"rendered":"\u0420\u0430\u0441\u0447\u0435\u0442 \u0434\u043e\u0437\u0438\u0440\u043e\u0432\u043a\u0438 \u0437\u0430\u043c\u0435\u0434\u043b\u0438\u0442\u0435\u043b\u044f \u0441\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u043d\u0438\u044f \u0433\u0438\u043f\u0441\u0430: \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u043f\u0440\u043e\u0433\u043d\u043e\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0441\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u043d\u0438\u044f"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"11807\" class=\"elementor elementor-11807\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6e1dbaa5 elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"6e1dbaa5\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4f54c720\" data-id=\"4f54c720\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-138fe9ff elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"138fe9ff\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-6c8a59f6\" data-id=\"6c8a59f6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5d9729eb elementor-widget elementor-widget-theme-post-title elementor-page-title elementor-widget-heading\" data-id=\"5d9729eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-title.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Gypsum Retarder Dosage Calculation: Setting Time Prediction &amp; Optimization Guide<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55d5363d elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"55d5363d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21c813ff elementor-align-center elementor-widget elementor-widget-post-info\" data-id=\"21c813ff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-8bf6eee elementor-inline-item\" itemprop=\"author\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/author\/protizerr-com\/\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-user-circle\" viewBox=\"0 0 496 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M248 104c-53 0-96 43-96 96s43 96 96 96 96-43 96-96-43-96-96-96zm0 144c-26.5 0-48-21.5-48-48s21.5-48 48-48 48 21.5 48 48-21.5 48-48 48zm0-240C111 8 0 119 0 256s111 248 248 248 248-111 248-248S385 8 248 8zm0 448c-49.7 0-95.1-18.3-130.1-48.4 14.9-23 40.4-38.6 69.6-39.5 20.8 6.4 40.6 9.6 60.5 9.6s39.7-3.1 60.5-9.6c29.2 1 54.7 16.5 69.6 39.5-35 30.1-80.4 48.4-130.1 48.4zm162.7-84.1c-24.4-31.4-62.1-51.9-105.1-51.9-10.2 0-26 9.6-57.6 9.6-31.5 0-47.4-9.6-57.6-9.6-42.9 0-80.6 20.5-105.1 51.9C61.9 339.2 48 299.2 48 256c0-110.3 89.7-200 200-200s200 89.7 200 200c0 43.2-13.9 83.2-37.3 115.9z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-author\">\n\t\t\t\t\t\t\t\t\t\tmichem\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-25d9750 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/2026\/07\/29\/\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>29 \u0438\u044e\u043b\u044f, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-028c855 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm61.8-104.4l-84.9-61.7c-3.1-2.3-4.9-5.9-4.9-9.7V116c0-6.6 5.4-12 12-12h32c6.6 0 12 5.4 12 12v141.7l66.8 48.6c5.4 3.9 6.5 11.4 2.6 16.8L334.6 349c-3.9 5.3-11.4 6.5-16.8 2.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-time\">\n\t\t\t\t\t\t\t\t\t\t<time>3:38 \u0434\u043f<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-2942f49e e-flex e-con-boxed e-con e-parent\" data-id=\"2942f49e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-46f99c02 e-con-full e-flex e-con e-child\" data-id=\"46f99c02\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-645e1235 elementor-widget elementor-widget-theme-post-featured-image elementor-widget-image\" data-id=\"645e1235\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-featured-image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation.webp\" class=\"attachment-large size-large wp-image-11809\" alt=\"Gypsum-Retarder-Dosage-Calculation\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation.webp 800w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67a93af4 elementor-widget elementor-widget-heading\" data-id=\"67a93af4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-76132421 elementor-widget elementor-widget-text-editor\" data-id=\"76132421\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>This guide provides a structured methodology for calculating the correct Michem <a href=\"https:\/\/michemicals.com\/various-performance-additives\/gypsum-retarder\/\">Gypsum Retarder<\/a> dosage to achieve a target setting time, based on three primary variables: dosage (0.1%\u20130.8% of gypsum weight), gypsum type (building gypsum, plaster of Paris, high-strength gypsum, or anhydrite), and ambient temperature. Michem Gypsum Retarder works by adsorbing onto the surface of gypsum crystal nuclei, inhibiting crystal growth and hydration reactions to delay the setting and hardening of gypsum \u2014 and the relationship between dosage and setting time extension is non-linear, following a diminishing-returns curve that is further modified by gypsum type and temperature.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10068e19 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"10068e19\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__10068e19\" aria-expanded=\"true\" aria-label=\"\u0641\u062a\u062d \u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__10068e19\" aria-expanded=\"true\" aria-label=\"\u0625\u063a\u0644\u0627\u0642 \u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__10068e19\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-39858559 elementor-widget elementor-widget-text-editor\" data-id=\"39858559\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The practical calculation approach presented here uses a baseline-reference method: establish the unretarded setting time of the specific gypsum source at the application temperature, then apply a retardation factor based on dosage to predict the retarded setting time. For building gypsum (\u03b2-hemihydrate) at 20\u00b0C with a baseline initial set of 10\u201315 minutes, a dosage of 0.2% extends set to 35\u201350 minutes (approximately 3.3\u00d7 baseline), 0.3% extends to 50\u201375 minutes (approximately 5\u00d7 baseline), and 0.5% extends to 90\u2013130 minutes (approximately 8.7\u00d7 baseline). These figures are modified by gypsum type (\u03b1-hemihydrate requires 20\u201350% higher dosage for equivalent extension; anhydrite requires different consideration due to its naturally slow hydration) and temperature (30\u00b0C reduces retarder efficiency by 20\u201340%, requiring dosage increase).<\/p><p>All calculations must be validated per ASTM C466 (setting time of gypsum) and ASTM C472 (sampling and testing gypsum) under actual project conditions. The methodology provides a starting dosage that minimizes trial-and-error iterations, not a substitute for project-specific verification.<\/p><h2>Key Takeaways<\/h2><ul><li>Setting time increases non-linearly with dosage: 0.1% gives ~2\u00d7 baseline, 0.3% gives ~5\u00d7 baseline, 0.5% gives ~8.7\u00d7 baseline, 0.8% gives ~14.7\u00d7 baseline (building gypsum, 20\u00b0C).<\/li><\/ul><ul><li>Gypsum type modifies the dosage-response curve: \u03b1-hemihydrate needs 20\u201350% more retarder than \u03b2-hemihydrate; anhydrite needs different treatment due to inherently slow hydration.<\/li><\/ul><ul><li>Temperature significantly affects retarder efficiency: 30\u00b0C reduces efficiency by 20\u201340% (increase dosage); 10\u00b0C increases efficiency by 30\u201350% (decrease dosage).<\/li><\/ul><ul><li>Practical calculation: target set time \u00f7 baseline set time = required retardation factor \u2192 look up dosage from factor table \u2192 adjust for gypsum type and temperature \u2192 validate per ASTM C466.<\/li><\/ul><ul><li>Always validate calculated dosage through site trials: the methodology provides a reliable starting point, but actual performance depends on gypsum source purity, fineness, water-gypsum ratio, and complete formulation.<\/li><\/ul><h2>Why This Answer Matters<\/h2><p>In gypsum product formulation, the retarder dosage is typically determined through iterative trial-and-error: start at an estimated dosage, measure the setting time per ASTM C466, adjust dosage up or down, retest, and repeat until the target setting time is achieved. While this approach works, it is time-consuming \u2014 each trial cycle may take 30\u201360 minutes for mixing, testing, and result interpretation \u2014 and it may require 3\u20135 cycles to converge on the correct dosage, particularly when working with an unfamiliar gypsum source or at a non-standard temperature.<\/p><p>A structured calculation methodology reduces this to 1\u20132 trial cycles. By starting from a dosage that is calculated to be close to the target, the formulator saves significant R&amp;D time, accelerates product development, and reduces the material waste associated with repeated trial batches. For manufacturers developing new product formulations or adapting existing formulations to new gypsum sources, this efficiency gain is substantial \u2014 a formulation that previously took 2 days of trial-and-error can often be completed in half a day.<\/p><p>Beyond efficiency, the calculation methodology also serves an educational purpose. Understanding the non-linear dosage-response relationship, the effect of gypsum type, and the temperature sensitivity of retarder efficiency gives formulators the knowledge to anticipate and diagnose problems. If a formulation that worked at 20\u00b0C suddenly shows flash set at 30\u00b0C, the formulator who understands the temperature- retarder interaction can immediately identify the cause and calculate the dosage adjustment needed, rather than beginning a new round of trial-and-error.<\/p><p>For quality control in production, the methodology provides a framework for interpreting setting time deviations. If a production batch shows a set time 20% shorter than target, the formulator can calculate whether this is within the expected variation range (gypsum source variation, ambient temperature fluctuation) or indicates a formulation error (retarder under-dosing, incorrect gypsum type). This diagnostic capability reduces production downtime and accelerates root-cause analysis of quality deviations.<\/p><h2>Technical Deep Dive<\/h2><h3>1. Dosage-Response Relationship: The Baseline Curve<\/h3><p>The fundamental relationship between Michem Gypsum Retarder dosage and setting time extension is non-linear. The following data establishes the baseline curve for building gypsum (\u03b2-hemihydrate) at 20\u00b0C, water-gypsum ratio 0.55, setting time measured per ASTM C466:<\/p><table><tbody><tr><td><p>Dosage (% of gypsum)<\/p><\/td><td><p>Retardation Factor (\u00d7 baseline)<\/p><\/td><td><p>Initial Set Time (min)<\/p><\/td><td><p>Marginal Extension per 0.1% Increment (min)<\/p><\/td><\/tr><tr><td><p>0%<\/p><\/td><td><p>1.0\u00d7<\/p><\/td><td><p>10\u201315<\/p><\/td><td><p>\u2014<\/p><\/td><\/tr><tr><td><p>0.1%<\/p><\/td><td><p>2.0\u00d7<\/p><\/td><td><p>20\u201330<\/p><\/td><td><p>10\u201315<\/p><\/td><\/tr><tr><td><p>0.2%<\/p><\/td><td><p>3.3\u00d7<\/p><\/td><td><p>35\u201350<\/p><\/td><td><p>15\u201320<\/p><\/td><\/tr><tr><td><p>0.3%<\/p><\/td><td><p>5.0\u00d7<\/p><\/td><td><p>50\u201375<\/p><\/td><td><p>15\u201325<\/p><\/td><\/tr><tr><td><p>0.4%<\/p><\/td><td><p>6.7\u00d7<\/p><\/td><td><p>70\u2013100<\/p><\/td><td><p>20\u201325<\/p><\/td><\/tr><tr><td><p>0.5%<\/p><\/td><td><p>8.7\u00d7<\/p><\/td><td><p>90\u2013130<\/p><\/td><td><p>20\u201330<\/p><\/td><\/tr><tr><td><p>0.6%<\/p><\/td><td><p>10.7\u00d7<\/p><\/td><td><p>110\u2013160<\/p><\/td><td><p>20\u201330<\/p><\/td><\/tr><tr><td><p>0.7%<\/p><\/td><td><p>12.7\u00d7<\/p><\/td><td><p>130\u2013190<\/p><\/td><td><p>20\u201330<\/p><\/td><\/tr><tr><td><p>0.8%<\/p><\/td><td><p>14.7\u00d7<\/p><\/td><td><p>150\u2013220<\/p><\/td><td><p>20\u201330<\/p><\/td><\/tr><\/tbody><\/table><p>Note: Indicative values based on \u03b2-hemihydrate building gypsum at 20\u00b0C, w\/g = 0.55. Retardation factor = retarded set time \u00f7 baseline set time. Must be validated per ASTM C466 and ASTM C472 under project conditions.<\/p><p>The curve is steepest between 0.1% and 0.3% (where each 0.1% increment adds 15\u201325 minutes of set time) and begins to plateau above 0.5% (where each increment adds a similar absolute amount but the proportional increase diminishes). Below 0.1%, the retardation effect is minimal and inconsistent.<\/p><h3>2. Gypsum Type Correction Factors<\/h3><p>The baseline curve above applies to building gypsum (\u03b2-hemihydrate). Other gypsum types require correction:<\/p><table><tbody><tr><td><p>Gypsum Type<\/p><\/td><td><p>Baseline Set (min, no retarder)<\/p><\/td><td><p>Correction Factor<\/p><\/td><td><p>Rationale<\/p><\/td><\/tr><tr><td><p>Building gypsum (\u03b2-hemihydrate)<\/p><\/td><td><p>8\u201315<\/p><\/td><td><p>1.0 (reference)<\/p><\/td><td><p>Standard baseline<\/p><\/td><\/tr><tr><td><p>Plaster of Paris (\u03b2-hemihydrate, fine)<\/p><\/td><td><p>5\u201310<\/p><\/td><td><p>0.8\u00d7 (less retarder needed)<\/p><\/td><td><p>Higher surface area \u2192 more nucleation sites \u2192 retarder more effective per unit<\/p><\/td><\/tr><tr><td><p>High-strength gypsum (\u03b1-hemihydrate)<\/p><\/td><td><p>15\u201325<\/p><\/td><td><p>1.3\u20131.5\u00d7 (more retarder needed)<\/p><\/td><td><p>Denser crystals \u2192 fewer nucleation sites per unit mass \u2192 retarder less effective<\/p><\/td><\/tr><tr><td><p>Anhydrite (CaSO\u2084)<\/p><\/td><td><p>60\u2013180+<\/p><\/td><td><p>0.5\u20130.8\u00d7 (less retarder needed)<\/p><\/td><td><p>Naturally slow hydration; retarder often unnecessary at normal temperatures<\/p><\/td><\/tr><\/tbody><\/table><p>To apply the correction: multiply the baseline dosage (from the dosage-response table) by the correction factor to obtain the adjusted dosage for that gypsum type.<\/p><p>Example: For a target of 50 minutes initial set with high-strength gypsum (\u03b1-hemihydrate):<\/p><ul><li>From the baseline table, 50 minutes requires approximately 0.3% dosage (building gypsum)<\/li><\/ul><ul><li>Correction factor for \u03b1-hemihydrate: 1.3\u20131.5\u00d7<\/li><\/ul><ul><li>Adjusted dosage: 0.3% \u00d7 1.4 (average) = 0.42% \u2192 round to 0.40%\u20130.45%<\/li><\/ul><ul><li>Verify per ASTM C466<\/li><\/ul><h3>3. Temperature Correction Factors<\/h3><p>Gypsum hydration and retarder efficiency are both temperature-dependent. Higher temperatures accelerate hydration (reducing baseline set time and reducing retarder effectiveness) and lower temperatures slow hydration (increasing baseline set time and increasing retarder effectiveness):<\/p><table><tbody><tr><td><p>Temperature<\/p><\/td><td><p>Baseline Set Correction<\/p><\/td><td><p>Retarder Efficiency Correction<\/p><\/td><td><p>Combined Dosage Adjustment<\/p><\/td><\/tr><tr><td><p>5\u00b0C<\/p><\/td><td><p>\u00d71.8\u20132.0 (set much slower)<\/p><\/td><td><p>\u00d71.5\u20131.8 (retarder more effective)<\/p><\/td><td><p>Reduce dosage by 40\u201355%<\/p><\/td><\/tr><tr><td><p>10\u00b0C<\/p><\/td><td><p>\u00d71.3\u20131.5<\/p><\/td><td><p>\u00d71.3\u20131.5<\/p><\/td><td><p>Reduce dosage by 25\u201335%<\/p><\/td><\/tr><tr><td><p>15\u00b0C<\/p><\/td><td><p>\u00d71.1\u20131.2<\/p><\/td><td><p>\u00d71.1\u20131.2<\/p><\/td><td><p>Reduce dosage by 10\u201315%<\/p><\/td><\/tr><tr><td><p>20\u00b0C (reference)<\/p><\/td><td><p>\u00d71.0<\/p><\/td><td><p>\u00d71.0<\/p><\/td><td><p>No adjustment<\/p><\/td><\/tr><tr><td><p>25\u00b0C<\/p><\/td><td><p>\u00d70.85\u20130.90<\/p><\/td><td><p>\u00d70.85\u20130.90<\/p><\/td><td><p>Increase dosage by 10\u201315%<\/p><\/td><\/tr><tr><td><p>30\u00b0C<\/p><\/td><td><p>\u00d70.6\u20130.8<\/p><\/td><td><p>\u00d70.6\u20130.8<\/p><\/td><td><p>Increase dosage by 20\u201340%<\/p><\/td><\/tr><tr><td><p>35\u00b0C<\/p><\/td><td><p>\u00d70.4\u20130.6<\/p><\/td><td><p>\u00d70.4\u20130.6<\/p><\/td><td><p>Increase dosage by 50\u201380%<\/p><\/td><\/tr><tr><td><p>40\u00b0C<\/p><\/td><td><p>\u00d70.3\u20130.5<\/p><\/td><td><p>\u00d70.3\u20130.5<\/p><\/td><td><p>Increase dosage by 80\u2013120% (or shift to cooler hours)<\/p><\/td><\/tr><\/tbody><\/table><p>Note: Corrections are indicative. The combined effect of temperature on both baseline set and retarder efficiency means the dosage adjustment is approximately the square of the individual corrections. Must be validated per ASTM C466 at the actual application temperature.<\/p><p>In field validation across temperature ranges, the Michem Technical Applications Team has confirmed that the temperature effect is often underestimated by formulators who work primarily at 20\u00b0C. A formulation calibrated at 20\u00b0C and applied at 35\u00b0C may set 40\u201360% faster than expected \u2014 not because the retarder failed, but because both the gypsum hydration kinetics and the retarder&#8217;s adsorption efficiency are temperature-dependent.<\/p><h3>4. Step-by-Step Dosage Calculation Methodology<\/h3><p>The following procedure combines the dosage-response curve, gypsum type correction, and temperature correction into a practical calculation method:<\/p><p><strong>Step 1: Determine baseline set time<\/strong> Measure the unretarded initial set time of the specific gypsum source at the application temperature, per ASTM C466.<\/p><p>Example: Building gypsum at 25\u00b0C, unretarded initial set = 8 minutes (faster than the 10\u201315 min reference at 20\u00b0C due to temperature).<\/p><p><strong>Step 2: Define target set time<\/strong> Determine the required initial set time based on application requirements.<\/p><p>Example: Machine-applied plaster requires 60 minutes initial set for continuous application.<\/p><p><strong>Step 3: Calculate required retardation factor<\/strong> Retardation factor = Target set time \u00f7 Baseline set time<\/p><p>Example: 60 min \u00f7 8 min = 7.5\u00d7 retardation factor required.<\/p><p><strong>Step 4: Look up base dosage from dosage-response table<\/strong> From the baseline table (building gypsum, 20\u00b0C), find the dosage that gives approximately 7.5\u00d7 retardation factor.<\/p><p>Example: 7.5\u00d7 falls between 0.4% (6.7\u00d7) and 0.5% (8.7\u00d7). Interpolate: approximately 0.45% base dosage.<\/p><p><strong>Step 5: Apply gypsum type correction (if not building gypsum)<\/strong> Multiply base dosage by the gypsum type correction factor.<\/p><p>Example: Using building gypsum \u2192 correction factor = 1.0 \u2192 no adjustment. Adjusted dosage = 0.45%.<\/p><p><strong>Step 6: Apply temperature correction<\/strong> Adjust for application temperature.<\/p><p>Example: At 25\u00b0C \u2192 increase dosage by 10\u201315%. Adjusted dosage = 0.45% \u00d7 1.15 = 0.52% \u2192 round to 0.50%.<\/p><p><strong>Step 7: Round to practical dosing precision<\/strong> Round to the nearest 0.05% (typical dry-dosing precision).<\/p><p>Example: 0.50% final calculated dosage.<\/p><p><strong>Step 8: Validate through trial<\/strong> Mix a trial batch at the calculated dosage and measure initial set per ASTM C466. If set time is within \u00b115% of target, the dosage is acceptable. If not, adjust by 0.05%\u20130.10% and retest.<\/p><p>Example: Trial at 0.50% gives 55 minutes initial set (target: 60 min). Within \u00b115% (51\u201369 min range). Acceptable.<\/p><h3>5. Worked Calculation Examples<\/h3><p><strong>Example A: Self-leveling screed at normal temperature<\/strong><\/p><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Value<\/p><\/td><\/tr><tr><td><p>Gypsum type<\/p><\/td><td><p>\u03b1-hemihydrate (high-strength)<\/p><\/td><\/tr><tr><td><p>Baseline set (measured at 20\u00b0C)<\/p><\/td><td><p>18 minutes<\/p><\/td><\/tr><tr><td><p>Target initial set<\/p><\/td><td><p>60 minutes<\/p><\/td><\/tr><tr><td><p>Required retardation factor<\/p><\/td><td><p>60 \u00f7 18 = 3.3\u00d7<\/p><\/td><\/tr><tr><td><p>Base dosage (from table, 3.3\u00d7)<\/p><\/td><td><p>0.20%<\/p><\/td><\/tr><tr><td><p>Gypsum type correction (\u03b1-hemihydrate)<\/p><\/td><td><p>\u00d71.4<\/p><\/td><\/tr><tr><td><p>Temperature correction (20\u00b0C)<\/p><\/td><td><p>\u00d71.0<\/p><\/td><\/tr><tr><td><p>Calculated dosage<\/p><\/td><td><p>0.20% \u00d7 1.4 \u00d7 1.0 = 0.28%<\/p><\/td><\/tr><tr><td><p>Rounded<\/p><\/td><td><p>0.30%<\/p><\/td><\/tr><tr><td><p>Grade<\/p><\/td><td><p>GR200 or GR300 (both \u25cf\u25cf\u25cf for self-leveling)<\/p><\/td><\/tr><\/tbody><\/table><p><strong>Example B: Decorative casting in hot weather<\/strong><\/p><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Value<\/p><\/td><\/tr><tr><td><p>Gypsum type<\/p><\/td><td><p>Plaster of Paris (fine \u03b2-hemihydrate)<\/p><\/td><\/tr><tr><td><p>Baseline set (measured at 30\u00b0C)<\/p><\/td><td><p>6 minutes<\/p><\/td><\/tr><tr><td><p>Target initial set<\/p><\/td><td><p>60 minutes<\/p><\/td><\/tr><tr><td><p>Required retardation factor<\/p><\/td><td><p>60 \u00f7 6 = 10.0\u00d7<\/p><\/td><\/tr><tr><td><p>Base dosage (from table, 10.0\u00d7)<\/p><\/td><td><p>0.58%<\/p><\/td><\/tr><tr><td><p>Gypsum type correction (plaster of Paris)<\/p><\/td><td><p>\u00d70.8<\/p><\/td><\/tr><tr><td><p>Temperature correction (30\u00b0C)<\/p><\/td><td><p>\u00d71.30<\/p><\/td><\/tr><tr><td><p>Calculated dosage<\/p><\/td><td><p>0.58% \u00d7 0.8 \u00d7 1.30 = 0.60%<\/p><\/td><\/tr><tr><td><p>Rounded<\/p><\/td><td><p>0.60%<\/p><\/td><\/tr><tr><td><p>Grade<\/p><\/td><td><p>GR150 (\u25cf\u25cf\u25cf for prefabricated components)<\/p><\/td><\/tr><\/tbody><\/table><p><strong>Example C: Winter putty application<\/strong><\/p><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Value<\/p><\/td><\/tr><tr><td><p>Gypsum type<\/p><\/td><td><p>Building gypsum<\/p><\/td><\/tr><tr><td><p>Baseline set (measured at 10\u00b0C)<\/p><\/td><td><p>22 minutes<\/p><\/td><\/tr><tr><td><p>Target initial set<\/p><\/td><td><p>40 minutes<\/p><\/td><\/tr><tr><td><p>Required retardation factor<\/p><\/td><td><p>40 \u00f7 22 = 1.8\u00d7<\/p><\/td><\/tr><tr><td><p>Base dosage (from table, 1.8\u00d7)<\/p><\/td><td><p>0.09%<\/p><\/td><\/tr><tr><td><p>Gypsum type correction (building gypsum)<\/p><\/td><td><p>\u00d71.0<\/p><\/td><\/tr><tr><td><p>Temperature correction (10\u00b0C)<\/p><\/td><td><p>\u00d70.70<\/p><\/td><\/tr><tr><td><p>Calculated dosage<\/p><\/td><td><p>0.09% \u00d7 1.0 \u00d7 0.70 = 0.063%<\/p><\/td><\/tr><tr><td><p>Rounded<\/p><\/td><td><p>0.10% (minimum practical dosage)<\/p><\/td><\/tr><tr><td><p>Grade<\/p><\/td><td><p>GR200 (\u25cf\u25cf\u25cf for gypsum putty)<\/p><\/td><\/tr><\/tbody><\/table><p>Note: At very low retardation factors (&lt;2\u00d7), the dosage falls near the minimum effective range (0.1%). Below 0.1%, retardation is inconsistent \u2014 if the calculated dosage is below 0.1%, either accept a longer set time (more than target) or use no retarder (rely on the naturally slow set at low temperature).<\/p><p>Site trials under EN\/ASTM protocols confirm that this calculation methodology produces dosages within \u00b120% of the experimentally determined optimal dosage in approximately 80% of cases. The remaining 20% \u2014 typically involving unusual gypsum sources (very high or low purity) or extreme temperatures (&lt;5\u00b0C or &gt;40\u00b0C) \u2014 require additional trial iterations.<\/p><p><a href=\"https:\/\/michemicals.com\/various-performance-additives\/gypsum-retarder\/\"><img decoding=\"async\" class=\"alignnone size-full wp-image-8402\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/04\/michem-Gypsum-Retarder-supplier.webp\" alt=\"michem-Gypsum-Retarder-supplier\" width=\"900\" height=\"600\" title=\"\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/04\/michem-Gypsum-Retarder-supplier.webp 900w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/04\/michem-Gypsum-Retarder-supplier-300x200.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/04\/michem-Gypsum-Retarder-supplier-768x512.webp 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><\/p><h2>Product Specifications<\/h2><table><tbody><tr><td><p>Property<\/p><\/td><td><p>Michem Gypsum Retarder (All Grades)<\/p><\/td><\/tr><tr><td><p>Brand<\/p><\/td><td><p>Michem<\/p><\/td><\/tr><tr><td><p>Product<\/p><\/td><td><p>Gypsum Retarder<\/p><\/td><\/tr><tr><td><p>Main Component<\/p><\/td><td><p>Organic acid complex \/ Polycarboxylate-based polymer<\/p><\/td><\/tr><tr><td><p>Appearance<\/p><\/td><td><p>White to off-white powder (general); Light yellow powder (grades)<\/p><\/td><\/tr><tr><td><p>Grades<\/p><\/td><td><p>GR150, GR200, GR300 (all: bulk density 700\u00b1100 g\/L, moisture \u22643%)<\/p><\/td><\/tr><tr><td><p>Recommended Dosage<\/p><\/td><td><p>0.1%\u20130.8% of gypsum weight<\/p><\/td><\/tr><tr><td><p>pH Value (1% solution)<\/p><\/td><td><p>5.0\u20137.0<\/p><\/td><\/tr><tr><td><p>Water Insoluble Matter<\/p><\/td><td><p>\u22640.5%<\/p><\/td><\/tr><tr><td><p>Compatible Gypsum Types<\/p><\/td><td><p>Building gypsum, plaster of Paris, high-strength gypsum, anhydrite<\/p><\/td><\/tr><tr><td><p>Shelf Life<\/p><\/td><td><p>12 months (sealed, dry conditions)<\/p><\/td><\/tr><tr><td><p>Packing<\/p><\/td><td><p>25 kg woven bag with PE inner liner; OEM packaging available<\/p><\/td><\/tr><tr><td><p>Quality System<\/p><\/td><td><p>ISO 9001:2015<\/p><\/td><\/tr><\/tbody><\/table><p>Source: Michem official technical specifications (michemicals.com).<\/p><h2>Practical Application Guide<\/h2><h3>Quick Reference Dosage Calculator<\/h3><table><tbody><tr><td><p>Target Set Time<\/p><\/td><td><p>Building Gypsum (20\u00b0C)<\/p><\/td><td><p>Plaster of Paris (20\u00b0C)<\/p><\/td><td><p>High-Strength Gypsum (20\u00b0C)<\/p><\/td><td><p>Anhydrite (20\u00b0C)<\/p><\/td><\/tr><tr><td><p>20 min<\/p><\/td><td><p>0.10%<\/p><\/td><td><p>0.08%<\/p><\/td><td><p>0.15%<\/p><\/td><td><p>0.05%*<\/p><\/td><\/tr><tr><td><p>30 min<\/p><\/td><td><p>0.15%<\/p><\/td><td><p>0.12%<\/p><\/td><td><p>0.20%<\/p><\/td><td><p>0.08%*<\/p><\/td><\/tr><tr><td><p>45 min<\/p><\/td><td><p>0.22%<\/p><\/td><td><p>0.18%<\/p><\/td><td><p>0.30%<\/p><\/td><td><p>0.15%*<\/p><\/td><\/tr><tr><td><p>60 min<\/p><\/td><td><p>0.28%<\/p><\/td><td><p>0.22%<\/p><\/td><td><p>0.40%<\/p><\/td><td><p>0.20%*<\/p><\/td><\/tr><tr><td><p>75 min<\/p><\/td><td><p>0.35%<\/p><\/td><td><p>0.28%<\/p><\/td><td><p>0.48%<\/p><\/td><td><p>0.25%*<\/p><\/td><\/tr><tr><td><p>90 min<\/p><\/td><td><p>0.42%<\/p><\/td><td><p>0.34%<\/p><\/td><td><p>0.58%<\/p><\/td><td><p>0.30%*<\/p><\/td><\/tr><tr><td><p>120 min<\/p><\/td><td><p>0.55%<\/p><\/td><td><p>0.44%<\/p><\/td><td><p>0.75%<\/p><\/td><td><p>0.40%*<\/p><\/td><\/tr><\/tbody><\/table><p>*Anhydrite may not require retarder at normal temperatures; values shown for hot-weather or large-pour conditions.<\/p><p>Note: Starting dosages for 20\u00b0C application. For other temperatures, apply the temperature correction factor. Always validate per ASTM C466.<\/p><h3>Temperature Adjustment Quick Reference<\/h3><table><tbody><tr><td><p>Application Temperature<\/p><\/td><td><p>Multiply Calculated Dosage By<\/p><\/td><\/tr><tr><td><p>5\u00b0C<\/p><\/td><td><p>\u00d70.50<\/p><\/td><\/tr><tr><td><p>10\u00b0C<\/p><\/td><td><p>\u00d70.70<\/p><\/td><\/tr><tr><td><p>15\u00b0C<\/p><\/td><td><p>\u00d70.88<\/p><\/td><\/tr><tr><td><p>20\u00b0C<\/p><\/td><td><p>\u00d71.00<\/p><\/td><\/tr><tr><td><p>25\u00b0C<\/p><\/td><td><p>\u00d71.15<\/p><\/td><\/tr><tr><td><p>30\u00b0C<\/p><\/td><td><p>\u00d71.30<\/p><\/td><\/tr><tr><td><p>35\u00b0C<\/p><\/td><td><p>\u00d71.65<\/p><\/td><\/tr><tr><td><p>40\u00b0C<\/p><\/td><td><p>\u00d72.00<\/p><\/td><\/tr><\/tbody><\/table><h3>Dosage Validation Protocol<\/h3><table><tbody><tr><td><p>Step<\/p><\/td><td><p>Action<\/p><\/td><td><p>Detail<\/p><\/td><\/tr><tr><td><p>1<\/p><\/td><td><p>Calculate dosage<\/p><\/td><td><p>Use the methodology above (Steps 1\u20137)<\/p><\/td><\/tr><tr><td><p>2<\/p><\/td><td><p>Mix trial batch<\/p><\/td><td><p>Use exact formulation including all additives; weigh materials precisely<\/p><\/td><\/tr><tr><td><p>3<\/p><\/td><td><p>Measure initial set<\/p><\/td><td><p>Per ASTM C466 (Vicat apparatus) at application temperature<\/p><\/td><\/tr><tr><td><p>4<\/p><\/td><td><p>Compare to target<\/p><\/td><td><p>If within \u00b115% of target \u2192 accept; if outside \u2192 adjust and retest<\/p><\/td><\/tr><tr><td><p>5<\/p><\/td><td><p>If set time too short<\/p><\/td><td><p>Increase dosage by 0.05%\u20130.10%; retest<\/p><\/td><\/tr><tr><td><p>6<\/p><\/td><td><p>If set time too long<\/p><\/td><td><p>Decrease dosage by 0.05%\u20130.10%; retest<\/p><\/td><\/tr><tr><td><p>7<\/p><\/td><td><p>Document final dosage<\/p><\/td><td><p>Record gypsum source, batch, temperature, and validated dosage for QC reference<\/p><\/td><\/tr><tr><td><p>8<\/p><\/td><td><p>Establish QC range<\/p><\/td><td><p>Set upper\/lower dosage limits (\u00b10.05% of validated dosage) per ISO 9001:2015<\/p><\/td><\/tr><\/tbody><\/table><h3>Quality Verification Checklist<\/h3><table><tbody><tr><td><p>Check<\/p><\/td><td><p>Method<\/p><\/td><td><p>Acceptance Criterion<\/p><\/td><\/tr><tr><td><p>Baseline set time (no retarder)<\/p><\/td><td><p>ASTM C466<\/p><\/td><td><p>Measured and recorded for each gypsum source<\/p><\/td><\/tr><tr><td><p>Retarded set time<\/p><\/td><td><p>ASTM C466<\/p><\/td><td><p>Within \u00b115% of target<\/p><\/td><\/tr><tr><td><p>Set time ratio (final\/initial)<\/p><\/td><td><p>ASTM C472<\/p><\/td><td><p>1.5\u20132.5\u00d7 (consistent hydration)<\/p><\/td><\/tr><tr><td><p>Strength verification<\/p><\/td><td><p>ASTM C472 \/ EN 13279-1<\/p><\/td><td><p>\u226590% of unretarded control at 28 days<\/p><\/td><\/tr><tr><td><p>Batch reproducibility<\/p><\/td><td><p>ISO 9001:2015 sampling<\/p><\/td><td><p>Set time CV \u226415% across batches<\/p><\/td><\/tr><tr><td><p>Temperature monitoring<\/p><\/td><td><p>Thermometer at mixing station<\/p><\/td><td><p>Recorded at each batch; dosage adjusted per temperature table<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-53440e2b elementor-widget elementor-widget-heading\" data-id=\"53440e2b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-47a092fb elementor-widget elementor-widget-accordion\" data-id=\"47a092fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1201\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1201\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How accurate is the calculation methodology?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1201\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1201\"><p>In approximately 80% of cases, the calculated dosage produces a setting time within \u00b120% of the target on the first trial. The remaining cases typically involve unusual gypsum sources (very high or low purity, unusual fineness) or extreme temperatures. A second trial with 0.05%\u20130.10% dosage adjustment almost always converges on the target. The methodology significantly reduces the number of trial iterations compared to unstructured trial-and-error.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1202\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1202\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Why does the dosage-response curve plateau at higher dosages?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1202\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1202\"><p>At higher dosages (above 0.5%), the retarder molecules saturate the available crystal nuclei surfaces. Additional retarder has fewer new nuclei to adsorb onto, so the marginal setting time extension per unit of additional dosage decreases. This is also why dosages above 0.8% are not recommended \u2014 the additional retardation is minimal and the risk of over-retardation (excessively slow set, strength reduction) increases disproportionately.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1203\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1203\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How do other additives in the formulation affect the dosage calculation?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1203\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1203\"><p>Michem HPMC (water retention) and MikaVAE\u00ae RDP (polymer film) do not significantly interact with the retarder&#8217;s mechanism and do not require dosage adjustment. However, if the formulation includes an accelerator (e.g., ground gypsum dihydrate, potassium sulfate), the retarder dosage may need to increase to compensate \u2014 typically by 0.05%\u20130.15% depending on accelerator dosage. Always test the complete formulation per ASTM C466, not just the gypsum + retarder binary system.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1204\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1204\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Can I use this methodology for gypsum types not listed (e.g., hemihydrate-anhydrite blends)?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1204\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1204\"><p>For blended gypsum systems, use the weighted average of the component correction factors. For a 70:30 blend of building gypsum (correction 1.0) and anhydrite (correction 0.65), the blend correction factor = (0.70 \u00d7 1.0 + 0.30 \u00d7 0.65) = 0.895. Apply this to the base dosage. Always validate blends per ASTM C466, as blend hydration kinetics can be non-linear relative to component proportions.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1205\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-1205\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">What should I do if the calculated dosage exceeds 0.8% (the maximum recommended)?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1205\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-1205\"><p>If the calculation yields a dosage above 0.8%, the target setting time is likely too long for the given gypsum type and temperature combination. Options include: (1) reduce the target setting time (accept a shorter working period); (2) switch to a gypsum type with naturally slower set (e.g., from plaster of Paris to building gypsum, or from \u03b2-hemihydrate to \u03b1-hemihydrate); (3) shift application to cooler hours (if temperature is the issue); (4) combine retarder with a coagulation-stabilizing additive (Michem HPMC) that provides some additional working time extension. Do not exceed 0.8% dosage \u2014 the additional retardation is minimal and strength loss becomes significant.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b0a6c0d elementor-widget elementor-widget-text-editor\" data-id=\"1b0a6c0d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Evidence &amp; Standards<\/h2><p><strong>Product data:<\/strong><\/p><ul><li><a href=\"https:\/\/michemicals.com\/various-performance-additives\/gypsum-retarder\/\">Michem Gypsum Retarder<\/a>: organic acid complex \/ polycarboxylate-based polymer, white to off-white powder (general); light yellow powder (grades), bulk density 700\u00b1100 g\/L, moisture \u22643%, dosage 0.1%\u20130.8%, pH 5.0\u20137.0 (1% solution), water insoluble matter \u22640.5%, 12-month shelf life. Compatible with building gypsum, plaster of Paris, high-strength gypsum, anhydrite.<\/li><\/ul><ul><li>Mechanism: &#8220;adsorbs onto the surface of gypsum crystal nuclei, inhibiting crystal growth and hydration reactions to delay the setting and hardening of gypsum.&#8221;<\/li><\/ul><p><strong>Standards cited:<\/strong><\/p><ul><li>ASTM C466: Standard test method for setting time of gypsum<\/li><\/ul><ul><li>ASTM C472: Standard test methods for sampling and testing gypsum<\/li><\/ul><ul><li>ASTM C28\/C28M: Standard test methods for gypsum<\/li><\/ul><ul><li>EN 13279-1: Gypsum binders and gypsum plasters \u2014 definitions and requirements<\/li><\/ul><ul><li>EN 13454-1: Calcium sulfate based binders for floor screeds<\/li><\/ul><ul><li>ISO 9001:2015: Quality management systems \u2014 requirements<\/li><\/ul><h2>References<\/h2><ol><li><a href=\"https:\/\/michemicals.com\/various-performance-additives\/gypsum-retarder\/\">Michem Gypsum Retarder<\/a> Technical Data Sheet. michemicals.com\/gypsum-retarder\/<\/li><\/ol><ol><li>ASTM C466. Standard Test Method for Setting Time of Gypsum. ASTM International.<\/li><\/ol><ol><li>ASTM C472. Standard Test Methods for Sampling and Testing Gypsum. ASTM International.<\/li><\/ol><ol><li>ASTM C28\/C28M. Standard Test Methods for Gypsum. ASTM International.<\/li><\/ol><ol><li>EN 13279-1. Gypsum binders and gypsum plasters \u2014 Part 1: Definitions and requirements. CEN.<\/li><\/ol><ol><li>EN 13454-1. Binders, composite binders and factory-made mixtures for floor screeds based on calcium sulfate. CEN.<\/li><\/ol><ol><li>ISO 9001:2015. Quality management systems \u2014 requirements. ISO.<\/li><\/ol><h2>About This Guide<\/h2><p><strong>Who it&#8217;s for:<\/strong> Gypsum product formulators, dry-mix mortar R&amp;D engineers, quality control technicians, and technical service engineers who need to calculate or predict gypsum retarder dosage for specific applications, gypsum types, and temperature conditions.<\/p><p><strong>How it was produced:<\/strong> Performance claims draw on Michem official product specifications (michemicals.com) and established EN\/ASTM test protocols. Field-experience observations are drawn from the Michem Technical Applications Team&#8217;s gypsum systems R&amp;D work.<\/p><p><strong>Limitations:<\/strong> The dosage-response curve, gypsum type correction factors, and temperature correction factors are indicative and based on the Michem Technical Applications Team&#8217;s experience with typical gypsum sources. Actual performance varies with gypsum source purity, fineness, crystal morphology, water-gypsum ratio, and complete formulation. The calculation methodology provides a reliable starting point (within \u00b120% in ~80% of cases) but must be validated through ASTM C466 site trials under actual project conditions. This guide does not replace engineering judgment or compliance with local building codes.<\/p><p><strong>Update policy:<\/strong> Reviewed annually, or whenever Michem product specifications or cited EN\/ASTM standards are revised.<\/p><h2>Conclusion &amp; CTA<\/h2><p><a href=\"https:\/\/michemicals.com\/various-performance-additives\/gypsum-retarder\/\">Michem Gypsum Retarder<\/a>&#8216;s non-linear dosage-response relationship, combined with gypsum type and temperature effects, makes structured dosage calculation an essential tool for efficient formulation development. The methodology presented here \u2014 baseline measurement, retardation factor calculation, dosage lookup, gypsum type and temperature correction, and ASTM C466 validation \u2014 reduces trial iterations from 3\u20135 to 1\u20132 in most cases, accelerating product development and reducing material waste. By understanding and applying the correction factors for \u03b1-hemihydrate (1.3\u20131.5\u00d7), plaster of Paris (0.8\u00d7), anhydrite (0.5\u20130.8\u00d7), and temperature (from \u00d70.50 at 5\u00b0C to \u00d72.00 at 40\u00b0C), formulators can reliably predict setting time across the full range of Michem Gypsum Retarder&#8217;s 0.1%\u20130.8% dosage range and all compatible gypsum types. With consistent physical properties (bulk density 700\u00b1100 g\/L, moisture \u22643%, pH 5.0\u20137.0) and ISO 9001:2015 manufacturing quality, Michem Gypsum Retarder delivers the predictable performance that makes accurate dosage calculation possible.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1edce29f elementor-widget elementor-widget-post-info\" data-id=\"1edce29f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-e766a79 elementor-inline-item\" itemprop=\"about\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-tags\" viewBox=\"0 0 640 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M497.941 225.941L286.059 14.059A48 48 0 0 0 252.118 0H48C21.49 0 0 21.49 0 48v204.118a48 48 0 0 0 14.059 33.941l211.882 211.882c18.744 18.745 49.136 18.746 67.882 0l204.118-204.118c18.745-18.745 18.745-49.137 0-67.882zM112 160c-26.51 0-48-21.49-48-48s21.49-48 48-48 48 21.49 48 48-21.49 48-48 48zm513.941 133.823L421.823 497.941c-18.745 18.745-49.137 18.745-67.882 0l-.36-.36L527.64 323.522c16.999-16.999 26.36-39.6 26.36-63.64s-9.362-46.641-26.36-63.64L331.397 0h48.721a48 48 0 0 1 33.941 14.059l211.882 211.882c18.745 18.745 18.745 49.137 0 67.882z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-terms\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-post-info__terms-list\">\n\t\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/%d1%82%d0%b5%d0%b3\/%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b0-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d1%81%d1%85%d0%b2%d0%b0%d1%82%d1%8b%d0%b2%d0%b0%d0%bd%d0%b8%d1%8f-%d0%b3\/\" class=\"elementor-post-info__terms-list-item\">Gypsum Retarder Dosage<\/a>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d77e49f elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"d77e49f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-navigation.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation\" role=\"navigation\" aria-label=\"\u041d\u0430\u0432\u0438\u0433\u0430\u0446\u0438\u044f \u0437\u0430\u043f\u0438\u0441\u0438\">\n\t\t\t<div class=\"elementor-post-navigation__prev elementor-post-navigation__link\">\n\t\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/hps-%d0%b4%d0%bb%d1%8f-%d0%be%d0%b1%d0%b5%d1%81%d0%bf%d0%b5%d1%87%d0%b5%d0%bd%d0%b8%d1%8f-%d1%83%d1%81%d1%82%d0%be%d0%b9%d1%87%d0%b8%d0%b2%d0%be%d1%81%d1%82%d0%b8-%d0%ba-%d0%bf%d1%80%d0%be%d0%b2%d0%b8\/\" rel=\"prev\"><span class=\"post-navigation__arrow-wrapper post-navigation__arrow-prev\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-left\" viewBox=\"0 0 256 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M31.7 239l136-136c9.4-9.4 24.6-9.4 33.9 0l22.6 22.6c9.4 9.4 9.4 24.6 0 33.9L127.9 256l96.4 96.4c9.4 9.4 9.4 24.6 0 33.9L201.7 409c-9.4 9.4-24.6 9.4-33.9 0l-136-136c-9.5-9.4-9.5-24.6-.1-34z\"><\/path><\/svg><span class=\"elementor-screen-only\">\u041f\u0440\u0435\u0434<\/span><\/span><span class=\"elementor-post-navigation__link__prev\"><span class=\"post-navigation__prev--label\">Previous<\/span><span class=\"post-navigation__prev--title\">HPS for Anti-Sag Performance in Tile Adhesive: Mechanism &amp; Dosage for Vertical Applications<\/span><\/span><\/a>\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation__separator-wrapper\">\n\t\t\t\t\t<div class=\"elementor-post-navigation__separator\"><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"elementor-post-navigation__next elementor-post-navigation__link\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7b52eb68 e-con-full e-flex e-con e-child\" data-id=\"7b52eb68\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-33bb4247 elementor-widget elementor-widget-heading\" data-id=\"33bb4247\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Recent Post<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-389e0bcf elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-card-shadow-yes elementor-posts__hover-gradient elementor-widget elementor-widget-posts\" data-id=\"389e0bcf\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cards_columns&quot;:&quot;3&quot;,&quot;cards_columns_tablet&quot;:&quot;2&quot;,&quot;cards_columns_mobile&quot;:&quot;1&quot;,&quot;cards_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;cards_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;cards_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.cards\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-cards elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11807 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-gypsum-retarder-dosage\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82-%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b8-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d0%b4%d0%bb%d1%8f-%d0%b3%d0%b8%d0%bf\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-300x188.webp\" class=\"attachment-medium size-medium wp-image-11809\" alt=\"Gypsum-Retarder-Dosage-Calculation\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation-18x12.webp 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/Gypsum-Retarder-Dosage-Calculation.webp 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82-%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b8-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d0%b4%d0%bb%d1%8f-%d0%b3%d0%b8%d0%bf\/\" >\n\t\t\t\tGypsum Retarder Dosage Calculation: Setting Time Prediction &amp; Optimization Guide\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/%d1%80%d0%b0%d1%81%d1%87%d0%b5%d1%82-%d0%b4%d0%be%d0%b7%d0%b8%d1%80%d0%be%d0%b2%d0%ba%d0%b8-%d0%b7%d0%b0%d0%bc%d0%b5%d0%b4%d0%bb%d0%b8%d1%82%d0%b5%d0%bb%d1%8f-%d0%b4%d0%bb%d1%8f-%d0%b3%d0%b8%d0%bf\/\" aria-label=\"Read more about Gypsum Retarder Dosage Calculation: Setting Time Prediction &amp; Optimization Guide\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t29 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11777 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-hps-for-tile-adhesive tag-hps-in-tile-adhesive\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/hps-%d0%b4%d0%bb%d1%8f-%d0%be%d0%b1%d0%b5%d1%81%d0%bf%d0%b5%d1%87%d0%b5%d0%bd%d0%b8%d1%8f-%d1%83%d1%81%d1%82%d0%be%d0%b9%d1%87%d0%b8%d0%b2%d0%be%d1%81%d1%82%d0%b8-%d0%ba-%d0%bf%d1%80%d0%be%d0%b2%d0%b8\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/michem-hps-in-tile-adhesive-300x188.webp\" class=\"attachment-medium size-medium wp-image-11779\" alt=\"michem-hps-in-tile-adhesive\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/michem-hps-in-tile-adhesive-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/michem-hps-in-tile-adhesive-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/michem-hps-in-tile-adhesive-18x12.webp 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/michem-hps-in-tile-adhesive.webp 880w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/hps-%d0%b4%d0%bb%d1%8f-%d0%be%d0%b1%d0%b5%d1%81%d0%bf%d0%b5%d1%87%d0%b5%d0%bd%d0%b8%d1%8f-%d1%83%d1%81%d1%82%d0%be%d0%b9%d1%87%d0%b8%d0%b2%d0%be%d1%81%d1%82%d0%b8-%d0%ba-%d0%bf%d1%80%d0%be%d0%b2%d0%b8\/\" >\n\t\t\t\tHPS for Anti-Sag Performance in Tile Adhesive: Mechanism &amp; Dosage for Vertical Applications\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/hps-%d0%b4%d0%bb%d1%8f-%d0%be%d0%b1%d0%b5%d1%81%d0%bf%d0%b5%d1%87%d0%b5%d0%bd%d0%b8%d1%8f-%d1%83%d1%81%d1%82%d0%be%d0%b9%d1%87%d0%b8%d0%b2%d0%be%d1%81%d1%82%d0%b8-%d0%ba-%d0%bf%d1%80%d0%be%d0%b2%d0%b8\/\" aria-label=\"Read more about HPS for Anti-Sag Performance in Tile Adhesive: Mechanism &amp; Dosage for Vertical Applications\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t28 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11760 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-michem-pce-sp630 tag-pce-powder-in-dry-mix-mortar\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/%d0%bf%d0%be%d1%80%d0%be%d1%88%d0%be%d0%ba-pce-%d0%b2-%d1%81%d1%83%d1%85%d0%be%d0%bc-%d1%81%d1%82%d1%80%d0%be%d0%b8%d1%82%d0%b5%d0%bb%d1%8c%d0%bd%d0%be%d0%bc-%d1%80%d0%b0%d1%81%d1%82%d0%b2%d0%be%d1%80\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/sp630-PCE-Powder-in-Dry-Mix-Mortar-300x188.jpg\" class=\"attachment-medium size-medium wp-image-11762\" alt=\"SP630 PCE Powder in Dry-Mix Mortar\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/sp630-PCE-Powder-in-Dry-Mix-Mortar-300x188.jpg 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/sp630-PCE-Powder-in-Dry-Mix-Mortar-768x480.jpg 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/sp630-PCE-Powder-in-Dry-Mix-Mortar-18x12.jpg 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/sp630-PCE-Powder-in-Dry-Mix-Mortar.jpg 880w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/%d0%bf%d0%be%d1%80%d0%be%d1%88%d0%be%d0%ba-pce-%d0%b2-%d1%81%d1%83%d1%85%d0%be%d0%bc-%d1%81%d1%82%d1%80%d0%be%d0%b8%d1%82%d0%b5%d0%bb%d1%8c%d0%bd%d0%be%d0%bc-%d1%80%d0%b0%d1%81%d1%82%d0%b2%d0%be%d1%80\/\" >\n\t\t\t\tPCE Powder in Dry-Mix Mortar: High-Range Water Reduction with SP630 for Portland Cement\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/%d0%bf%d0%be%d1%80%d0%be%d1%88%d0%be%d0%ba-pce-%d0%b2-%d1%81%d1%83%d1%85%d0%be%d0%bc-%d1%81%d1%82%d1%80%d0%be%d0%b8%d1%82%d0%b5%d0%bb%d1%8c%d0%bd%d0%be%d0%bc-%d1%80%d0%b0%d1%81%d1%82%d0%b2%d0%be%d1%80\/\" aria-label=\"Read more about PCE Powder in Dry-Mix Mortar: High-Range Water Reduction with SP630 for Portland Cement\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t27 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11740 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-hec-for-detergent tag-hec-for-industrial tag-hec-thickener\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/hec-is-the-preferred-thickener-for-detergent\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HEC-Is-the-Preferred-Thickener-for-Detergent-300x188.webp\" class=\"attachment-medium size-medium wp-image-11742\" alt=\"HEC-Is-the-Preferred-Thickener-for-Detergent\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HEC-Is-the-Preferred-Thickener-for-Detergent-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HEC-Is-the-Preferred-Thickener-for-Detergent-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HEC-Is-the-Preferred-Thickener-for-Detergent-18x12.webp 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HEC-Is-the-Preferred-Thickener-for-Detergent.webp 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/hec-is-the-preferred-thickener-for-detergent\/\" >\n\t\t\t\tWhy HEC Is the Preferred Thickener for Detergent &amp; Industrial Cleaning Formulations\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/hec-is-the-preferred-thickener-for-detergent\/\" aria-label=\"Read more about Why HEC Is the Preferred Thickener for Detergent &amp; Industrial Cleaning Formulations\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t24 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11734 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-cmc-fir-dry-mix-mortar tag-dry-mix-mortar-shelf-life\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/%d0%ba%d0%b0%d0%ba-cmc-%d0%bf%d1%80%d0%be%d0%b4%d0%bb%d0%b5%d0%b2%d0%b0%d0%b5%d1%82-%d1%81%d1%80%d0%be%d0%ba-%d1%85%d1%80%d0%b0%d0%bd%d0%b5%d0%bd%d0%b8%d1%8f-%d1%81%d1%83%d1%85%d0%b8%d1%85-%d1%81\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/06\/pce-flakes-for-dry-mix-mortar-300x188.webp\" class=\"attachment-medium size-medium wp-image-10565\" alt=\"pce flakes,hps,cmc for dry mix mortar\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/06\/pce-flakes-for-dry-mix-mortar-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/06\/pce-flakes-for-dry-mix-mortar-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/06\/pce-flakes-for-dry-mix-mortar-18x12.webp 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/06\/pce-flakes-for-dry-mix-mortar.webp 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/%d0%ba%d0%b0%d0%ba-cmc-%d0%bf%d1%80%d0%be%d0%b4%d0%bb%d0%b5%d0%b2%d0%b0%d0%b5%d1%82-%d1%81%d1%80%d0%be%d0%ba-%d1%85%d1%80%d0%b0%d0%bd%d0%b5%d0%bd%d0%b8%d1%8f-%d1%81%d1%83%d1%85%d0%b8%d1%85-%d1%81\/\" >\n\t\t\t\tHow CMC Extends Dry-Mix Mortar Shelf Life?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/%d0%ba%d0%b0%d0%ba-cmc-%d0%bf%d1%80%d0%be%d0%b4%d0%bb%d0%b5%d0%b2%d0%b0%d0%b5%d1%82-%d1%81%d1%80%d0%be%d0%ba-%d1%85%d1%80%d0%b0%d0%bd%d0%b5%d0%bd%d0%b8%d1%8f-%d1%81%d1%83%d1%85%d0%b8%d1%85-%d1%81\/\" aria-label=\"Read more about How CMC Extends Dry-Mix Mortar Shelf Life?\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t24 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-11719 post type-post status-publish format-standard has-post-thumbnail hentry category-blog tag-cmc-degree tag-cmc-water-retention tag-michem-cmc\" role=\"listitem\">\n\t\t\t<div class=\"elementor-post__card\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/michemicals.com\/ru\/%d1%81%d1%82%d0%b5%d0%bf%d0%b5%d0%bd%d1%8c-%d0%b7%d0%b0%d0%bc%d0%b5%d1%89%d0%b5%d0%bd%d0%b8%d1%8f-cmc\/\" tabindex=\"-1\" ><div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Degree-of-Substitution-300x188.webp\" class=\"attachment-medium size-medium wp-image-11722\" alt=\"CMC Degree of Substitution\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Degree-of-Substitution-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Degree-of-Substitution-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Degree-of-Substitution-18x12.webp 18w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Degree-of-Substitution.webp 960w\" sizes=\"(max-width: 300px) 100vw, 300px\" title=\"\"><\/div><\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/michemicals.com\/ru\/%d1%81%d1%82%d0%b5%d0%bf%d0%b5%d0%bd%d1%8c-%d0%b7%d0%b0%d0%bc%d0%b5%d1%89%d0%b5%d0%bd%d0%b8%d1%8f-cmc\/\" >\n\t\t\t\tCMC Degree of Substitution (DS 0.65\u20130.9): How DS Determines Water Retention, Viscosity &amp; Solubility\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/michemicals.com\/ru\/%d1%81%d1%82%d0%b5%d0%bf%d0%b5%d0%bd%d1%8c-%d0%b7%d0%b0%d0%bc%d0%b5%d1%89%d0%b5%d0%bd%d0%b8%d1%8f-cmc\/\" aria-label=\"Read more about CMC Degree of Substitution (DS 0.65\u20130.9): How DS Determines Water Retention, Viscosity &amp; Solubility\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\t23 \u0438\u044e\u043b\u044f, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cd15d4e elementor-hidden-tablet elementor-hidden-mobile e-con-full e-flex e-con e-child\" data-id=\"cd15d4e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-243bd108 e-con-full e-flex e-con e-child\" data-id=\"243bd108\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_offset&quot;:50,&quot;sticky_parent&quot;:&quot;yes&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;tablet&quot;,&quot;mobile&quot;],&quot;sticky_effects_offset&quot;:0,&quot;sticky_anchor_link_offset&quot;:0}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6c44adcb elementor-widget elementor-widget-shortcode\" data-id=\"6c44adcb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t<div data-elementor-type=\"section\" data-elementor-id=\"11640\" class=\"elementor elementor-11640\" data-elementor-post-type=\"elementor_library\">\n\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5a6170b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5a6170b\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-24e0ef8\" data-id=\"24e0ef8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-eb984a7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"eb984a7\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-6544f38\" data-id=\"6544f38\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3812970 elementor-search-form--skin-classic elementor-search-form--button-type-icon elementor-search-form--icon-search elementor-widget elementor-widget-search-form\" data-id=\"3812970\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;skin&quot;:&quot;classic&quot;}\" data-widget_type=\"search-form.default\">\n\t\t\t\t\t\t\t<search role=\"search\">\n\t\t\t<form class=\"elementor-search-form\" action=\"https:\/\/michemicals.com\/ru\" method=\"get\">\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-search-form__container\">\n\t\t\t\t\t<label class=\"elementor-screen-only\" for=\"elementor-search-form-3812970\">\u041f\u043e\u0438\u0441\u043a<\/label>\n\n\t\t\t\t\t\n\t\t\t\t\t<input id=\"elementor-search-form-3812970\" placeholder=\"Search...\" class=\"elementor-search-form__input\" type=\"search\" name=\"s\" value=\"\">\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t<button class=\"elementor-search-form__submit\" type=\"submit\" aria-label=\"\u041f\u043e\u0438\u0441\u043a\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"e-font-icon-svg-container\"><svg class=\"fa fa-search e-font-icon-svg e-fas-search\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M505 442.7L405.3 343c-4.5-4.5-10.6-7-17-7H372c27.6-35.3 44-79.7 44-128C416 93.1 322.9 0 208 0S0 93.1 0 208s93.1 208 208 208c48.3 0 92.7-16.4 128-44v16.3c0 6.4 2.5 12.5 7 17l99.7 99.7c9.4 9.4 24.6 9.4 33.9 0l28.3-28.3c9.4-9.4 9.4-24.6.1-34zM208 336c-70.7 0-128-57.2-128-128 0-70.7 57.2-128 128-128 70.7 0 128 57.2 128 128 0 70.7-57.2 128-128 128z\"><\/path><\/svg><\/div>\t\t\t\t\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/form>\n\t\t<\/search>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-df9db6c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"df9db6c\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-4b5c14d\" data-id=\"4b5c14d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0e3e96a elementor-author-box--layout-image-above elementor-author-box--align-center elementor-widget elementor-widget-author-box\" data-id=\"0e3e96a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<div  class=\"elementor-author-box__avatar\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2025\/02\/beauty-200x300.jpeg\" alt=\"Picture of Sales Manager\" loading=\"lazy\" title=\"\">\n\t\t\t\t<\/div>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<div >\n\t\t\t\t\t\t<h5 class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tSales Manager\t\t\t\t\t\t<\/h5>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\t<p>I'm Tinna,I have been engaged in the cellulose ether industry for 15 years.I'd be happy to share my post with you. If you have any good ideas, please let me know.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d5f75d e-grid-align-mobile-center elementor-shape-rounded elementor-grid-0 e-grid-align-center elementor-widget elementor-widget-social-icons\" data-id=\"6d5f75d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"social-icons.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-social-icons-wrapper elementor-grid\" role=\"list\">\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-facebook elementor-animation-pulse-shrink elementor-repeater-item-e808987\" href=\"https:\/\/www.facebook.com\/MICHEMICALS\/\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">Facebook<\/span>\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-facebook\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256c0 123.78 90.69 226.38 209.25 245V327.69h-63V256h63v-54.64c0-62.15 37-96.48 93.67-96.48 27.14 0 55.52 4.84 55.52 4.84v61h-31.28c-30.8 0-40.41 19.12-40.41 38.73V256h68.78l-11 71.69h-57.78V501C413.31 482.38 504 379.78 504 256z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-x-twitter elementor-animation-pulse-shrink elementor-repeater-item-c60b593\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">X-twitter<\/span>\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-x-twitter\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-icon-youtube-v elementor-animation-pulse-shrink elementor-repeater-item-e832e63\" href=\"https:\/\/www.youtube.com\/@michemcals\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">Icon-youtube-v<\/span>\n\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"icon icon-youtube-v\"><\/i>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-whatsapp elementor-animation-pulse-shrink elementor-repeater-item-1282787\" href=\"https:\/\/api.whatsapp.com\/send?phone=8617862186910\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">Whatsapp<\/span>\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-whatsapp\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M380.9 97.1C339 55.1 283.2 32 223.9 32c-122.4 0-222 99.6-222 222 0 39.1 10.2 77.3 29.6 111L0 480l117.7-30.9c32.4 17.7 68.9 27 106.1 27h.1c122.3 0 224.1-99.6 224.1-222 0-59.3-25.2-115-67.1-157zm-157 341.6c-33.2 0-65.7-8.9-94-25.7l-6.7-4-69.8 18.3L72 359.2l-4.4-7c-18.5-29.4-28.2-63.3-28.2-98.2 0-101.7 82.8-184.5 184.6-184.5 49.3 0 95.6 19.2 130.4 54.1 34.8 34.9 56.2 81.2 56.1 130.5 0 101.8-84.9 184.6-186.6 184.6zm101.2-138.2c-5.5-2.8-32.8-16.2-37.9-18-5.1-1.9-8.8-2.8-12.5 2.8-3.7 5.6-14.3 18-17.6 21.8-3.2 3.7-6.5 4.2-12 1.4-32.6-16.3-54-29.1-75.5-66-5.7-9.8 5.7-9.1 16.3-30.3 1.8-3.7.9-6.9-.5-9.7-1.4-2.8-12.5-30.1-17.1-41.2-4.5-10.8-9.1-9.3-12.5-9.5-3.2-.2-6.9-.2-10.6-.2-3.7 0-9.7 1.4-14.8 6.9-5.1 5.6-19.4 19-19.4 46.3 0 27.3 19.9 53.7 22.6 57.4 2.8 3.7 39.1 59.7 94.8 83.8 35.2 15.2 49 16.5 66.6 13.9 10.7-1.6 32.8-13.4 37.4-26.4 4.6-13 4.6-24.1 3.2-26.4-1.3-2.5-5-3.9-10.5-6.6z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d17e403 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"d17e403\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-hand-point-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M428.8 137.6h-86.177a115.52 115.52 0 0 0 2.176-22.4c0-47.914-35.072-83.2-92-83.2-45.314 0-57.002 48.537-75.707 78.784-7.735 12.413-16.994 23.317-25.851 33.253l-.131.146-.129.148C135.662 161.807 127.764 168 120.8 168h-2.679c-5.747-4.952-13.536-8-22.12-8H32c-17.673 0-32 12.894-32 28.8v230.4C0 435.106 14.327 448 32 448h64c8.584 0 16.373-3.048 22.12-8h2.679c28.688 0 67.137 40 127.2 40h21.299c62.542 0 98.8-38.658 99.94-91.145 12.482-17.813 18.491-40.785 15.985-62.791A93.148 93.148 0 0 0 393.152 304H428.8c45.435 0 83.2-37.584 83.2-83.2 0-45.099-38.101-83.2-83.2-83.2zm0 118.4h-91.026c12.837 14.669 14.415 42.825-4.95 61.05 11.227 19.646 1.687 45.624-12.925 53.625 6.524 39.128-10.076 61.325-50.6 61.325H248c-45.491 0-77.21-35.913-120-39.676V215.571c25.239-2.964 42.966-21.222 59.075-39.596 11.275-12.65 21.725-25.3 30.799-39.875C232.355 112.712 244.006 80 252.8 80c23.375 0 44 8.8 44 35.2 0 35.2-26.4 53.075-26.4 70.4h158.4c18.425 0 35.2 16.5 35.2 35.2 0 18.975-16.225 35.2-35.2 35.2zM88 384c0 13.255-10.745 24-24 24s-24-10.745-24-24 10.745-24 24-24 24 10.745 24 24z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Contact Us<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5760174 elementor-widget elementor-widget-text-editor\" data-id=\"5760174\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Please contact me for the latest quote or to request a sample test (our samples are free and include shipping).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a4ed85c elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"a4ed85c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"11640\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"a4ed85c\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Gypsum Retarder Dosage Calculation: Setting Time Prediction &amp; Optimization Guide - Michem Chemical\" \/>\n\n\t\t\t\t\t\t\t<input type=\"hidden\" name=\"queried_id\" value=\"11807\"\/>\n\t\t\t\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-above\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-tel elementor-field-group elementor-column elementor-field-group-Phone elementor-col-100 elementor-field-required\">\n\t\t\t\t\t<span class=\"ccfef-editor-intl-input\" data-id=\"form-field-Phone\" data-field-id=\"c8411e0\" data-default-country=\"us\" data-include-countries=\"\" data-exclude-countries=\"\" data-dial-code-visibility=\"show\" data-strict-mode=\"no\" style=\"display: none;\"><\/span>\t\t<input size=\"1\" type=\"tel\" name=\"form_fields[Phone]\" id=\"form-field-Phone\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" required=\"required\" pattern=\"[0-9()#&amp;+*-=.]+\" title=\"\u064a\u062a\u0645 \u0642\u0628\u0648\u0644 \u0627\u0644\u0623\u0631\u0642\u0627\u0645 \u0648\u0623\u062d\u0631\u0641 \u0627\u0644\u0647\u0627\u062a\u0641 \u0641\u0642\u0637 (#\u060c - \u060c *\u060c \u0625\u0644\u062e).\">\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-Company elementor-col-100\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[Company]\" id=\"form-field-Company\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100\">\n\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Message\"><\/textarea>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-group elementor-column elementor-field-type-submit elementor-col-100 e-form__buttons\">\n\t\t\t\t\t<button class=\"elementor-button elementor-size-sm\" type=\"submit\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-double-right\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34zm192-34l-136-136c-9.4-9.4-24.6-9.4-33.9 0l-22.6 22.6c-9.4 9.4-9.4 24.6 0 33.9l96.4 96.4-96.4 96.4c-9.4 9.4-9.4 24.6 0 33.9l22.6 22.6c9.4 9.4 24.6 9.4 33.9 0l136-136c9.4-9.2 9.4-24.4 0-33.8z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Send Inquiry Now<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/form>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Introduction This guide provides a structured methodology for calculating the correct Michem Gypsum Retarder dosage<\/p>","protected":false},"author":1,"featured_media":11809,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_angie_page":false,"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","page_builder":"","footnotes":""},"categories":[1],"tags":[273],"class_list":["post-11807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-gypsum-retarder-dosage"],"_links":{"self":[{"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/posts\/11807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/comments?post=11807"}],"version-history":[{"count":3,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/posts\/11807\/revisions"}],"predecessor-version":[{"id":11812,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/posts\/11807\/revisions\/11812"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/media\/11809"}],"wp:attachment":[{"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/media?parent=11807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/categories?post=11807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michemicals.com\/ru\/wp-json\/wp\/v2\/tags?post=11807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}