{"id":11086,"date":"2026-06-29T07:47:25","date_gmt":"2026-06-29T07:47:25","guid":{"rendered":"https:\/\/michemicals.com\/?p=11086"},"modified":"2026-06-29T07:53:00","modified_gmt":"2026-06-29T07:53:00","slug":"calcium-formate-gypsum-accelerator","status":"publish","type":"post","link":"https:\/\/michemicals.com\/vi\/calcium-formate-gypsum-accelerator\/","title":{"rendered":"Calcium Formate as a Gypsum Accelerator: Faster Setting for Plaster, Joint Filler and Plasterboard Production"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"11086\" class=\"elementor elementor-11086\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1aa98cda elementor-reverse-mobile elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1aa98cda\" data-element_type=\"section\" data-e-type=\"section\" 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itemprop=\"author\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/vi\/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<\/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<div class=\"elementor-element elementor-element-3c3f09f8 e-flex e-con-boxed e-con e-parent\" data-id=\"3c3f09f8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3cd49fd5 e-con-full e-flex e-con e-child\" data-id=\"3cd49fd5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-15a3e4fd e-con-full e-flex e-con e-child\" data-id=\"15a3e4fd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2858cf63 elementor-widget elementor-widget-heading\" data-id=\"2858cf63\" 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-2a6bd4d5 elementor-widget elementor-widget-text-editor\" data-id=\"2a6bd4d5\" 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>Gypsum (calcium sulfate hemihydrate, CaSO\u2084\u00b70.5H\u2082O) is one of the most widely used binders in construction \u2014 powering machine-applied plasters, joint fillers, self-leveling underlayments, and the global plasterboard industry. When mixed with water, gypsum plaster rehydrates to form calcium sulfate dihydrate (CaSO\u2084\u00b72H\u2082O), setting into a hard, white, smooth surface.<\/p><p>But the natural setting time of gypsum plaster \u2014 typically\u00a0<strong>25\u201345 minutes<\/strong>\u00a0for \u03b2-hemihydrate \u2014 is often too slow for modern production lines and fast-track construction schedules. Accelerators are needed. And while several options exist,\u00a0<strong>calcium formate<\/strong>\u00a0has emerged as one of the most versatile and reliable gypsum accelerators \u2014 offering fast, controllable setting without the detrimental side effects of traditional accelerators.<\/p><p>This guide explains the chemistry, performance, and formulation of calcium formate as a gypsum accelerator across plaster, joint filler, and plasterboard applications.<\/p>\t\t\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<div class=\"elementor-element elementor-element-78382525 e-flex e-con-boxed e-con e-parent\" data-id=\"78382525\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3ea820 e-con-full e-flex e-con e-child\" data-id=\"3ea820\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-13604ffa e-con-full e-flex e-con e-child\" data-id=\"13604ffa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-16d0f3da e-con-full e-flex e-con e-child\" data-id=\"16d0f3da\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6c3f3ebf elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"6c3f3ebf\" 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__6c3f3ebf\" aria-expanded=\"true\" aria-label=\"Deschide\u021bi tabelul de con\u021binut\"><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__6c3f3ebf\" aria-expanded=\"true\" aria-label=\"\u00cenchide tabelul de con\u021binut\"><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__6c3f3ebf\" 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-c9e514f elementor-widget elementor-widget-text-editor\" data-id=\"c9e514f\" 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>Gypsum Setting Chemistry: The Basics<\/h2><p>When hemihydrate gypsum dissolves in water and reprecipitates as dihydrate, the setting process occurs in three stages:<\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Stage<\/th><th>Process<\/th><th>Duration<\/th><\/tr><\/thead><tbody><tr><td>1. Dissolution<\/td><td>Hemihydrate dissolves, saturating the solution with Ca\u00b2\u207a and SO\u2084\u00b2\u207b<\/td><td>1\u20135 min<\/td><\/tr><tr><td>2. Nucleation<\/td><td>Dihydrate crystals nucleate from the supersaturated solution<\/td><td>5\u201315 min<\/td><\/tr><tr><td>3. Crystal growth<\/td><td>Dihydrate crystals grow and interlock, forming a rigid structure<\/td><td>10\u201330 min<\/td><\/tr><\/tbody><\/table><\/div><p>Accelerators work primarily by\u00a0<strong>speeding up nucleation<\/strong>\u00a0\u2014 providing crystal-growth sites that reduce the energy barrier for dihydrate precipitation. The faster nucleation begins, the sooner the crystal-growth and setting stages follow.<\/p><hr \/><h2>Traditional Gypsum Accelerators and Their Limitations<\/h2><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Accelerator<\/th><th>Mechanism<\/th><th>Advantage<\/th><th>Limitation<\/th><\/tr><\/thead><tbody><tr><td>Potassium sulfate (K\u2082SO\u2084)<\/td><td>Salting-out effect, reduces hemihydrate solubility<\/td><td>Cheap, widely available<\/td><td>Can reduce final strength by 10\u201320%; narrow dosage window<\/td><\/tr><tr><td>Sodium sulfate (Na\u2082SO\u2084)<\/td><td>Similar to K\u2082SO\u2084<\/td><td>Low cost<\/td><td>Efflorescence risk; can cause delayed expansion<\/td><\/tr><tr><td>Calcium sulfate dihydrate (ground)<\/td><td>Provides nucleation sites (seed crystals)<\/td><td>Very effective; standard industry practice<\/td><td>Dosage-sensitive; overdosing causes flash set; quality varies by source<\/td><\/tr><tr><td>Retarder + accelerator combination<\/td><td>Retarder controls set, accelerator tunes final time<\/td><td>Precise control<\/td><td>Complex formulation; two additives to balance<\/td><\/tr><tr><td>Calcium formate<\/td><td>Accelerates nucleation; provides Ca\u00b2\u207a ions<\/td><td>Chloride-free, low strength loss, compatible with additives<\/td><td>Slightly higher cost than sulfates<\/td><\/tr><\/tbody><\/table><\/div><h3>The Problem with Sulfate Accelerators<\/h3><p>Traditional sulfate accelerators (K\u2082SO\u2084, Na\u2082SO\u2084) reduce hemihydrate solubility \u2014 but they also reduce the total amount of dihydrate that can form, because the solution is already saturated with sulfate ions. This\u00a0<strong>reduces the final crystal network density<\/strong>, leading to measurable strength loss.<\/p><p>Additionally, sodium sulfate introduces soluble sodium ions that can cause\u00a0<strong>efflorescence<\/strong>\u00a0\u2014 white salt deposits on the plaster surface that are aesthetically unacceptable, especially in decorative applications.<\/p><hr \/><h2>Why Calcium Formate Is Different<\/h2><h3>Mechanism: Dual-Action Acceleration<\/h3><p>Calcium formate (Ca(HCOO)\u2082) accelerates gypsum setting through two complementary mechanisms:<\/p><ol><li><p><strong>Calcium ion supply:<\/strong>\u00a0The additional Ca\u00b2\u207a ions shift the dissolution-reprecipitation equilibrium, increasing the supersaturation of dihydrate and accelerating nucleation.<\/p><\/li><li><p><strong>Formate ion effect:<\/strong>\u00a0Formate ions modify the crystal habit of precipitating dihydrate, promoting the formation of more, smaller crystals \u2014 which interlock faster than fewer, larger crystals.<\/p><\/li><\/ol><p>Unlike sulfate accelerators, calcium formate does\u00a0<strong>not<\/strong>\u00a0reduce hemihydrate solubility. The hemihydrate still dissolves fully, and the dihydrate crystal network forms completely \u2014 preserving final strength.<\/p><h3>Key Advantages Over Sulfate Accelerators<\/h3><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Property<\/th><th>Calcium Formate<\/th><th>Potassium Sulfate<\/th><th>Sodium Sulfate<\/th><\/tr><\/thead><tbody><tr><td>Setting time reduction<\/td><td>Strong<\/td><td>Strong<\/td><td>Moderate<\/td><\/tr><tr><td>Final strength effect<\/td><td>Minimal loss (0\u20135%)<\/td><td>Moderate loss (10\u201320%)<\/td><td>Moderate loss (10\u201315%)<\/td><\/tr><tr><td>Efflorescence risk<\/td><td>None<\/td><td>Low<\/td><td>High<\/td><\/tr><tr><td>Chloride content<\/td><td>Zero<\/td><td>Zero<\/td><td>Zero<\/td><\/tr><tr><td>Compatibility with HPMC<\/td><td>Excellent<\/td><td>Good<\/td><td>Good<\/td><\/tr><tr><td>Compatibility with RDP<\/td><td>Excellent<\/td><td>Good<\/td><td>Good<\/td><\/tr><tr><td>Compatibility with retarders<\/td><td>Excellent (easy to tune)<\/td><td>Good<\/td><td>Good<\/td><\/tr><tr><td>Cost<\/td><td>Moderate<\/td><td>Low<\/td><td>Low<\/td><\/tr><tr><td>Shelf life of treated plaster<\/td><td>Stable<\/td><td>Stable<\/td><td>May cake (hygroscopic)<\/td><\/tr><\/tbody><\/table><\/div><hr \/><h2>Michem Calcium Formate Specifications<\/h2><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Property<\/th><th>Specification<\/th><\/tr><\/thead><tbody><tr><td>Brand<\/td><td>Michem<\/td><\/tr><tr><td>Purity<\/td><td>\u2265 98%<\/td><\/tr><tr><td>Calcium content<\/td><td>~30%<\/td><\/tr><tr><td>Moisture<\/td><td>\u2264 0.5%<\/td><\/tr><tr><td>pH (10% aqueous solution)<\/td><td>6.5\u20137.5<\/td><\/tr><tr><td>Water-insoluble matter<\/td><td>\u2264 0.5%<\/td><\/tr><tr><td>Form<\/td><td>White crystalline powder<\/td><\/tr><tr><td>Packaging<\/td><td>25 kg paper-plastic composite bag<\/td><\/tr><tr><td>Recommended dosage<\/td><td>0.2\u20132.0% (by gypsum weight)<\/td><\/tr><tr><td>Shelf life<\/td><td>12 months (dry storage, &lt; 30 \u00b0C)<\/td><\/tr><\/tbody><\/table><\/div><blockquote><p><strong>Important:<\/strong>\u00a0Michem calcium formate shelf life is\u00a0<strong>12 months<\/strong>\u00a0from manufacture date. Store in original sealed packaging in a dry environment. Do not use caked or discoloured material \u2014 it indicates moisture absorption and reduced activity.<\/p><\/blockquote><hr \/><h2>Application Guide: Calcium Formate in Gypsum Products<\/h2><h3>Application 1: Machine-Applied Gypsum Plaster<\/h3><p>Machine-applied gypsum plaster (also called gypsum render or machine plaster) is sprayed onto walls using a continuous mixer-pump. The plaster needs enough open time for leveling and smoothing (15\u201325 minutes) but should set fast enough for same-day finishing.<\/p><p><strong>Formulation framework:<\/strong><\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Component<\/th><th>Content (wt%)<\/th><\/tr><\/thead><tbody><tr><td>\u03b2-hemihydrate gypsum<\/td><td>88\u201393<\/td><\/tr><tr><td>Limestone flour (filler)<\/td><td>3\u20138<\/td><\/tr><tr><td>HPMC (Michem MH75K, PS)<\/td><td>0.15\u20130.25<\/td><\/tr><tr><td>Retarder (protein-based or citric acid)<\/td><td>0.03\u20130.08<\/td><\/tr><tr><td><strong>Calcium formate (Michem)<\/strong><\/td><td><strong>0.3\u20130.8<\/strong><\/td><\/tr><tr><td>Defoamer<\/td><td>0.05<\/td><\/tr><tr><td>Fibreglass fiber or PP fiber<\/td><td>0.3\u20130.5<\/td><\/tr><\/tbody><\/table><\/div><p><strong>Dosage strategy:<\/strong>\u00a0The retarder and calcium formate work as a tuning pair. Increase the retarder to extend open time, then add calcium formate to bring the final set back within the target window. Typical calcium formate dosage:\u00a0<strong>0.3\u20130.8%<\/strong>.<\/p><p><strong>Setting time target:<\/strong><\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Target<\/th><th>Initial Set<\/th><th>Final Set<\/th><\/tr><\/thead><tbody><tr><td>Machine plaster (standard)<\/td><td>25\u201335 min<\/td><td>40\u201355 min<\/td><\/tr><tr><td>Machine plaster (fast-track)<\/td><td>15\u201320 min<\/td><td>25\u201335 min<\/td><\/tr><\/tbody><\/table><\/div><h3>Application 2: Gypsum Joint Filler (Joint Compound)<\/h3><p>Joint filler is used to fill gaps between plasterboard panels and to embed joint tape. It requires:<\/p><ul><li><strong>Easy sanding<\/strong>\u00a0after set<\/li><li><strong>Low shrinkage<\/strong>\u00a0to avoid recessed joints<\/li><li><strong>Fast setting<\/strong>\u00a0for multi-coat application within one day<\/li><li><strong>Smooth surface<\/strong>\u00a0for painting<\/li><\/ul><p><strong>Formulation framework:<\/strong><\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Component<\/th><th>Content (wt%)<\/th><\/tr><\/thead><tbody><tr><td>\u03b1-hemihydrate gypsum (or blend with \u03b2)<\/td><td>75\u201385<\/td><\/tr><tr><td>Calcium carbonate (filler)<\/td><td>10\u201318<\/td><\/tr><tr><td>HPMC (Michem MH04K or MH75K)<\/td><td>0.3\u20130.5<\/td><\/tr><tr><td>Retarder (tartaric acid or sodium citrate)<\/td><td>0.05\u20130.10<\/td><\/tr><tr><td><strong>Calcium formate (Michem)<\/strong><\/td><td><strong>0.5\u20131.5<\/strong><\/td><\/tr><tr><td>Defoamer<\/td><td>0.05<\/td><\/tr><tr><td>Thickener (starch ether or MHEC)<\/td><td>0.1\u20130.2<\/td><\/tr><\/tbody><\/table><\/div><p><strong>Dosage strategy:<\/strong>\u00a0Joint fillers need faster setting than wall plaster \u2014 often 30\u201350 minutes initial set for the first coat. Calcium formate dosage is typically\u00a0<strong>0.5\u20131.5%<\/strong>. The low-viscosity HPMC MH04K ensures smooth application and easy sanding.<\/p><h3>Application 3: Gypsum-Based Self-Leveling Underlayment<\/h3><p>Gypsum self-leveling compounds are used to level floors before installing tile, wood, or carpet. They require:<\/p><ul><li><strong>High flow<\/strong>\u00a0(self-leveling behaviour)<\/li><li><strong>Controlled setting<\/strong>\u00a0(30\u201360 minutes working time)<\/li><li><strong>High final strength<\/strong>\u00a0(\u2265 15 MPa compressive)<\/li><\/ul><p><strong>Formulation framework:<\/strong><\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Component<\/th><th>Content (wt%)<\/th><\/tr><\/thead><tbody><tr><td>\u03b1-hemihydrate gypsum<\/td><td>55\u201365<\/td><\/tr><tr><td>Calcium carbonate (filler)<\/td><td>25\u201335<\/td><\/tr><tr><td>HPMC (Michem MH04K)<\/td><td>0.1\u20130.15<\/td><\/tr><tr><td>PCE superplasticizer (Michem SP670)<\/td><td>0.15\u20130.30<\/td><\/tr><tr><td>Retarder<\/td><td>0.05\u20130.10<\/td><\/tr><tr><td><strong>Calcium formate (Michem)<\/strong><\/td><td><strong>0.3\u20130.6<\/strong><\/td><\/tr><tr><td>Defoamer<\/td><td>0.05<\/td><\/tr><\/tbody><\/table><\/div><blockquote><p><strong>Note:<\/strong>\u00a0Michem\u00a0<strong>SP670<\/strong>\u00a0is the PCE grade specifically formulated for gypsum-based products. Using SP670 instead of a standard OPC-grade PCE avoids interference with gypsum hydration.<\/p><\/blockquote><h3>Application 4: Plasterboard Production<\/h3><p>In plasterboard manufacturing, the slurry must set within\u00a0<strong>4\u20138 minutes<\/strong>\u00a0to allow continuous production on the board line. The accelerator system is critical \u2014 too slow, and the board doesn&#8217;t harden before the cutting knife; too fast, and the slurry sets in the mixer.<\/p><p><strong>Typical accelerator system:<\/strong><\/p><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Component<\/th><th>Dosage (by stucco weight)<\/th><\/tr><\/thead><tbody><tr><td>Ground dihydrate (seed crystal)<\/td><td>0.5\u20132.0%<\/td><\/tr><tr><td><strong>Calcium formate (Michem)<\/strong><\/td><td><strong>0.1\u20130.3%<\/strong><\/td><\/tr><tr><td>Optional: K\u2082SO\u2084 booster<\/td><td>0\u20130.2%<\/td><\/tr><\/tbody><\/table><\/div><p><strong>Why calcium formate in plasterboard:<\/strong>\u00a0The board line requires extremely precise set-time control \u2014 within \u00b130 seconds of target. Calcium formate provides a\u00a0<strong>linear, predictable<\/strong>\u00a0acceleration response, making fine-tuning easier than ground-dihydrate alone (which varies by source and grinding fineness). The low dosage (0.1\u20130.3%) keeps cost minimal while improving consistency.<\/p><hr \/><h2>Performance Data: Calcium Formate Dosage vs. Setting Time<\/h2><h3>\u03b2-Hemihydrate Plaster (Baseline: 42 min initial set, no accelerator)<\/h3><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Calcium Formate (%)<\/th><th>Initial Set (min)<\/th><th>Final Set (min)<\/th><th>Compressive Strength (MPa, 2 h)<\/th><th>Strength Retention (%)<\/th><\/tr><\/thead><tbody><tr><td>0.0<\/td><td>42<\/td><td>58<\/td><td>6.2<\/td><td>100<\/td><\/tr><tr><td>0.2<\/td><td>35<\/td><td>50<\/td><td>6.1<\/td><td>98<\/td><\/tr><tr><td>0.5<\/td><td>26<\/td><td>40<\/td><td>6.0<\/td><td>97<\/td><\/tr><tr><td>0.8<\/td><td>20<\/td><td>32<\/td><td>5.9<\/td><td>95<\/td><\/tr><tr><td>1.2<\/td><td>15<\/td><td>25<\/td><td>5.8<\/td><td>94<\/td><\/tr><tr><td>1.5<\/td><td>12<\/td><td>20<\/td><td>5.6<\/td><td>90<\/td><\/tr><tr><td>2.0<\/td><td>9<\/td><td>15<\/td><td>5.3<\/td><td>85<\/td><\/tr><\/tbody><\/table><\/div><blockquote><p><strong>Interpretation:<\/strong>\u00a0Up to 1.2% calcium formate, strength retention remains above 94% \u2014 far better than sulfate accelerators, which typically cause 10\u201320% strength loss at equivalent acceleration levels. Above 1.5%, diminishing returns on setting time and increasing strength loss suggest the practical upper limit for most applications.<\/p><\/blockquote><h3>Comparison: Calcium Formate vs. Potassium Sulfate<\/h3><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Accelerator (0.5% dosage)<\/th><th>Initial Set (min)<\/th><th>Strength (MPa)<\/th><th>Strength Retention<\/th><\/tr><\/thead><tbody><tr><td>None (control)<\/td><td>42<\/td><td>6.2<\/td><td>100%<\/td><\/tr><tr><td>Calcium formate<\/td><td>26<\/td><td>6.0<\/td><td>97%<\/td><\/tr><tr><td>Potassium sulfate<\/td><td>24<\/td><td>5.1<\/td><td>82%<\/td><\/tr><\/tbody><\/table><\/div><p>Calcium formate achieves nearly the same acceleration with\u00a0<strong>15 percentage points better strength retention<\/strong>.<\/p><hr \/><h2>Compatibility with Other Gypsum Additives<\/h2><div class=\"cb-markdown-table-wrapper\"><table><thead><tr><th>Additive<\/th><th>Compatibility<\/th><th>Notes<\/th><\/tr><\/thead><tbody><tr><td>HPMC (Michem MH-series)<\/td><td>Excellent<\/td><td>No interaction; both function independently<\/td><\/tr><tr><td>PCE (Michem SP670)<\/td><td>Excellent<\/td><td>SP670 is formulated specifically for gypsum systems<\/td><\/tr><tr><td>Citric acid (retarder)<\/td><td>Excellent<\/td><td>Calcium formate and citric acid can be co-dosed for precise set-time tuning<\/td><\/tr><tr><td>Tartaric acid (retarder)<\/td><td>Excellent<\/td><td>Same as citric acid<\/td><\/tr><tr><td>Protein-based retarder<\/td><td>Excellent<\/td><td>Common in machine plaster formulations<\/td><\/tr><tr><td>RDP (MikaVAE\u00ae)<\/td><td>Excellent<\/td><td>Calcium formate does not interfere with polymer film formation<\/td><\/tr><tr><td>Starch ether<\/td><td>Good<\/td><td>Minor thickening interaction; adjust HPMC dosage if needed<\/td><\/tr><tr><td>Defoamer<\/td><td>Excellent<\/td><td>No interaction<\/td><\/tr><\/tbody><\/table><\/div><hr \/><h2>Regional Market Considerations<\/h2><h3>India<\/h3><p>Gypsum plaster (commonly called &#8220;POP&#8221; \u2014 Plaster of Paris) is the dominant interior wall-finishing material. The market is shifting from hand-applied to machine-applied systems, driving demand for controlled-set formulations. Calcium formate at 0.3\u20130.8% is ideal for machine plaster with 25\u201335 minute initial set.<\/p><h3>GCC \/ Middle East<\/h3><p>Gypsum plaster is the standard interior finish in residential and commercial construction. The hot climate demands faster setting (to avoid excessive water evaporation before set) and higher early strength. Calcium formate at 0.5\u20131.0% is commonly used.<\/p><h3>Europe<\/h3><p>Plasterboard production is highly industrialised, with extremely tight set-time control requirements. Calcium formate at 0.1\u20130.3% is used as a consistency enhancer alongside ground-dihydrate accelerator systems. Joint filler formulations use 0.5\u20131.0%.<\/p><h3>Southeast Asia<\/h3><p>Gypsum plaster competes with cement-based skim coat. Where gypsum is used, fast-setting formulations are preferred due to labour productivity pressures. Calcium formate at 0.5\u20131.2% is typical.<\/p><hr \/><h2>Formulation Tips<\/h2><h3>Tip 1: Always Pre-Blend Dry<\/h3><p>Calcium formate is a crystalline powder that can segregate from finer gypsum particles during transport. Always pre-blend all dry components (gypsum, filler, HPMC, calcium formate, retarder, defoamer) in a high-shear mixer for at least 3 minutes before packaging.<\/p><h3>Tip 2: Tune Retarder and Accelerator Together<\/h3><p>The retarder controls the open time (how long the applicator can work). The accelerator controls the final set time (how soon the plaster is hard enough for the next step). Adjust both together \u2014 increase retarder by 0.01% for each 0.1% increase in calcium formate \u2014 to maintain open time while accelerating final set.<\/p><h3>Tip 3: Account for Gypsum Source Variation<\/h3><p>Different gypsum sources (natural vs. FGD \u2014 flue gas desulfurization) have different impurity profiles that affect setting behaviour. Always re-optimise the calcium formate dosage when changing gypsum source.<\/p><h3>Tip 4: Protect Against Moisture<\/h3><p>Calcium formate is moderately hygroscopic. In humid climates, ensure packaging is moisture-proof (PE-lined bags) and storage is climate-controlled. Caked calcium formate should be broken up and screened (1 mm sieve) before use, or discarded if severely degraded.<\/p><h3>Tip 5: Test in the Final Formulation \u2014 Not Just Pure Gypsum<\/h3><p>Pure gypsum lab tests give baseline data, but real formulations contain HPMC, PCE, fillers, and fibers that all interact with the setting process. Always validate calcium formate dosage in the full formulation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-694aa66 elementor-widget elementor-widget-heading\" data-id=\"694aa66\" 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-6a3ef2b elementor-widget elementor-widget-accordion\" data-id=\"6a3ef2b\" 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-1111\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1111\" 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 calcium formate be used in cement-based systems as well as gypsum?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1111\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1111\"><p>Yes. Calcium formate is an effective accelerator in both gypsum and Portland cement systems. In cement, it provides early-strength acceleration without chlorides (see our companion articles on calcium formate in concrete). The dosage and mechanism differ between the two binder systems, so always optimise separately.<\/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-1112\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1112\" 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\">Does calcium formate affect the whiteness of gypsum plaster?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1112\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1112\"><p>No. Michem calcium formate is a white crystalline powder with \u2265 98% purity. At the recommended dosages (0.2\u20132.0%), it has no measurable effect on the whiteness or colour of the finished plaster surface.<\/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-1113\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1113\" 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 does calcium formate compare to calcium chloride as an accelerator?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1113\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1113\"><p>Calcium chloride is a powerful accelerator but introduces\u00a0<strong>chloride ions<\/strong>\u00a0that corrode steel reinforcement and are prohibited in reinforced concrete. Calcium formate is\u00a0<strong>completely chloride-free<\/strong>\u00a0and safe for all applications, including those in contact with steel. In gypsum systems, calcium chloride is rarely used due to its hygroscopicity and corrosion risk.<\/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-1114\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1114\" 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 happens if I overdose calcium formate in gypsum plaster?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1114\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1114\"><p>Above 2.0%, you&#8217;ll see diminishing acceleration returns, increasing strength loss (down to 85% or lower), and potentially faster drying shrinkage. Overdosing above 3% can cause a &#8220;flash set&#8221; where the plaster hardens before it can be applied. Stay within the 0.2\u20132.0% range.<\/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-1115\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-1115\" 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 calcium formate with both \u03b1 and \u03b2 hemihydrate?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1115\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-1115\"><p>Yes. Calcium formate accelerates both \u03b1-hemihydrate (used in high-strength applications, dental plaster, self-leveling) and \u03b2-hemihydrate (used in wall plaster, joint filler, standard plasterboard). The dosage may differ \u2014 \u03b1-hemihydrate typically requires slightly less accelerator due to its different crystal morphology and higher intrinsic reactivity.<\/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-1116\" class=\"elementor-tab-title\" data-tab=\"6\" role=\"button\" aria-controls=\"elementor-tab-content-1116\" 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 is the shelf life of gypsum plaster containing calcium formate?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1116\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"6\" role=\"region\" aria-labelledby=\"elementor-tab-title-1116\"><p>The dry-mix plaster has a shelf life of 6\u201312 months when stored dry. Calcium formate itself has a shelf life of 12 months. The limiting factor for the plaster is usually the gypsum (which can partially rehydrate during storage) and the HPMC, not the calcium formate.<\/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-62d0b58 elementor-widget elementor-widget-text-editor\" data-id=\"62d0b58\" 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>Conclusion<\/h2><p>Calcium formate is the modern accelerator of choice for gypsum-based construction products \u2014 offering fast, controllable setting with minimal strength loss, no efflorescence, and excellent compatibility with the full range of gypsum additives. Whether you&#8217;re formulating machine-applied wall plaster, gypsum joint filler, self-leveling underlayment, or industrial plasterboard, calcium formate provides the setting-time precision that production efficiency demands.<\/p><p>Michem calcium formate \u2014 with \u2265 98% purity, ~30% calcium content, and a 12-month shelf life \u2014 is available in 25 kg composite bags for both formulators and large-scale manufacturers. The recommended dosage range of 0.2\u20132.0% covers the full spectrum of gypsum applications, from subtle set-time tuning in plasterboard to aggressive acceleration in fast-set joint fillers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4692828 elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"4692828\" 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=\"Post Navigation\">\n\t\t\t<div class=\"elementor-post-navigation__prev elementor-post-navigation__link\">\n\t\t\t\t<a href=\"https:\/\/michemicals.com\/vi\/superplasticizer-dosage-optimization\/\" rel=\"prev\"><span class=\"post-navigation__arrow-wrapper post-navigation__arrow-prev\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-left\" viewBox=\"0 0 320 512\" 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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-6a05ed34 elementor-widget elementor-widget-text-editor\" data-id=\"6a05ed34\" 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-1aa75790 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"1aa75790\" data-element_type=\"widget\" data-e-type=\"widget\" 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acceptate numai numerele \u0219i caracterele telefonice (#, -, *, etc.).\">\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<div class=\"elementor-element elementor-element-46cc8b69 e-con-full e-flex e-con e-child\" data-id=\"46cc8b69\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2c170eed elementor-widget elementor-widget-wp-widget-tag_cloud\" data-id=\"2c170eed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wp-widget-tag_cloud.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5>Tags<\/h5><div class=\"tagcloud\"><a href=\"https:\/\/michemicals.com\/vi\/the\/fiber-reinforced-concrete\/\" class=\"tag-cloud-link tag-link-182 tag-link-position-1\" style=\"font-size: 8pt;\" aria-label=\"&quot;fiber reinforced concrete&quot; (1 m\u1ee5c)\">&quot;fiber reinforced concrete&quot;<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/pp-fiber-for-shotcrete\/\" class=\"tag-cloud-link tag-link-181 tag-link-position-2\" style=\"font-size: 8pt;\" aria-label=\"&quot;PP fiber for shotcrete&quot; (1 m\u1ee5c)\">&quot;PP fiber for shotcrete&quot;<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/shotcrete\/\" class=\"tag-cloud-link tag-link-179 tag-link-position-3\" style=\"font-size: 8pt;\" aria-label=\"&quot;shotcrete&quot; (1 m\u1ee5c)\">&quot;shotcrete&quot;<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/tunnel-construction\/\" class=\"tag-cloud-link tag-link-183 tag-link-position-4\" style=\"font-size: 8pt;\" aria-label=\"&quot;tunnel construction&quot; (1 m\u1ee5c)\">&quot;tunnel construction&quot;<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/tunnel-lining\/\" class=\"tag-cloud-link tag-link-180 tag-link-position-5\" style=\"font-size: 8pt;\" aria-label=\"&quot;tunnel lining&quot; (1 m\u1ee5c)\">&quot;tunnel lining&quot;<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/canxi-formiat\/\" class=\"tag-cloud-link tag-link-139 tag-link-position-6\" style=\"font-size: 22pt;\" aria-label=\"calcium formate (4 m\u1ee5c)\">calcium formate<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/ether-cellulose\/\" class=\"tag-cloud-link tag-link-194 tag-link-position-7\" style=\"font-size: 8pt;\" aria-label=\"cellulose ether (1 m\u1ee5c)\">cellulose ether<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/vua-xi-mang\/\" class=\"tag-cloud-link tag-link-175 tag-link-position-8\" style=\"font-size: 14.3pt;\" aria-label=\"cementitious grout (2 m\u1ee5c)\">cementitious grout<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/concrete-admixture\/\" class=\"tag-cloud-link tag-link-150 tag-link-position-9\" style=\"font-size: 14.3pt;\" aria-label=\"concrete admixture] (2 m\u1ee5c)\">concrete admixture]<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/concrete-mix-design\/\" class=\"tag-cloud-link tag-link-201 tag-link-position-10\" style=\"font-size: 8pt;\" aria-label=\"concrete mix design (1 m\u1ee5c)\">concrete mix design<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/concrete-pavement\/\" class=\"tag-cloud-link tag-link-195 tag-link-position-11\" style=\"font-size: 8pt;\" aria-label=\"concrete pavement (1 m\u1ee5c)\">concrete pavement<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/concrete-repair\/\" class=\"tag-cloud-link tag-link-187 tag-link-position-12\" style=\"font-size: 8pt;\" aria-label=\"concrete repair (1 m\u1ee5c)\">concrete repair<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/do-ben-be-tong\/\" class=\"tag-cloud-link tag-link-177 tag-link-position-13\" style=\"font-size: 8pt;\" aria-label=\"concrete strength (1 m\u1ee5c)\">concrete strength<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/construction-chemicals\/\" class=\"tag-cloud-link tag-link-188 tag-link-position-14\" style=\"font-size: 18.5pt;\" aria-label=\"construction chemicals (3 m\u1ee5c)\">construction chemicals<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/crack-control\/\" class=\"tag-cloud-link tag-link-196 tag-link-position-15\" style=\"font-size: 8pt;\" aria-label=\"crack control (1 m\u1ee5c)\">crack control<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/dosage-optimization\/\" class=\"tag-cloud-link tag-link-199 tag-link-position-16\" style=\"font-size: 8pt;\" aria-label=\"dosage optimization (1 m\u1ee5c)\">dosage optimization<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/suc-manh-ban-dau\/\" class=\"tag-cloud-link tag-link-141 tag-link-position-17\" style=\"font-size: 14.3pt;\" aria-label=\"early strength (2 m\u1ee5c)\">early strength<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/vua-dong-cung-nhanh\/\" class=\"tag-cloud-link tag-link-173 tag-link-position-18\" style=\"font-size: 14.3pt;\" aria-label=\"fast setting grout (2 m\u1ee5c)\">fast setting grout<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/finishing-plaster\/\" class=\"tag-cloud-link tag-link-193 tag-link-position-19\" style=\"font-size: 8pt;\" aria-label=\"finishing plaster (1 m\u1ee5c)\">finishing plaster<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/phu-gia-vua-2\/\" class=\"tag-cloud-link tag-link-174 tag-link-position-20\" style=\"font-size: 14.3pt;\" aria-label=\"grout admixture (2 m\u1ee5c)\">grout admixture<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/gypsum-accelerator\/\" class=\"tag-cloud-link tag-link-202 tag-link-position-21\" style=\"font-size: 8pt;\" aria-label=\"gypsum accelerator (1 m\u1ee5c)\">gypsum accelerator<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/be-tong-hieu-suat-cao\/\" class=\"tag-cloud-link tag-link-155 tag-link-position-22\" style=\"font-size: 14.3pt;\" aria-label=\"high performance concrete (2 m\u1ee5c)\">high performance concrete<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/hpc-formulation\/\" class=\"tag-cloud-link tag-link-178 tag-link-position-23\" style=\"font-size: 8pt;\" aria-label=\"HPC formulation (1 m\u1ee5c)\">HPC formulation<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/hpmc\/\" class=\"tag-cloud-link tag-link-156 tag-link-position-24\" style=\"font-size: 14.3pt;\" aria-label=\"HPMC (2 m\u1ee5c)\">HPMC<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/soi-sieu-min\/\" class=\"tag-cloud-link tag-link-149 tag-link-position-25\" style=\"font-size: 14.3pt;\" aria-label=\"micro fiber (2 m\u1ee5c)\">micro fiber<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/pce\/\" class=\"tag-cloud-link tag-link-154 tag-link-position-26\" style=\"font-size: 14.3pt;\" aria-label=\"PCE (2 m\u1ee5c)\">PCE<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/pce-admixture\/\" class=\"tag-cloud-link tag-link-135 tag-link-position-27\" style=\"font-size: 14.3pt;\" aria-label=\"PCE admixture (2 m\u1ee5c)\">PCE admixture<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/plasterboard\/\" class=\"tag-cloud-link tag-link-204 tag-link-position-28\" style=\"font-size: 8pt;\" aria-label=\"plasterboard (1 m\u1ee5c)\">plasterboard<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/plaster-setting\/\" class=\"tag-cloud-link tag-link-203 tag-link-position-29\" style=\"font-size: 8pt;\" aria-label=\"plaster setting (1 m\u1ee5c)\">plaster setting<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/chat-sieu-deo-polycarboxylate\/\" class=\"tag-cloud-link tag-link-133 tag-link-position-30\" style=\"font-size: 14.3pt;\" aria-label=\"polycarboxylate superplasticizer (2 m\u1ee5c)\">polycarboxylate superplasticizer<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/polymer-modified-mortar\/\" class=\"tag-cloud-link tag-link-171 tag-link-position-31\" style=\"font-size: 14.3pt;\" aria-label=\"polymer-modified mortar (2 m\u1ee5c)\">polymer-modified mortar<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/soi-polypropylene\/\" class=\"tag-cloud-link tag-link-146 tag-link-position-32\" style=\"font-size: 14.3pt;\" aria-label=\"polypropylene fiber (2 m\u1ee5c)\">polypropylene fiber<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/pp-fiber\/\" class=\"tag-cloud-link tag-link-145 tag-link-position-33\" style=\"font-size: 14.3pt;\" aria-label=\"PP fiber (2 m\u1ee5c)\">PP fiber<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/procurement\/\" class=\"tag-cloud-link tag-link-190 tag-link-position-34\" style=\"font-size: 8pt;\" aria-label=\"procurement (1 m\u1ee5c)\">procurement<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/quality-control\/\" class=\"tag-cloud-link tag-link-189 tag-link-position-35\" style=\"font-size: 8pt;\" aria-label=\"quality control (1 m\u1ee5c)\">quality control<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/rdp\/\" class=\"tag-cloud-link tag-link-185 tag-link-position-36\" style=\"font-size: 14.3pt;\" aria-label=\"RDP (2 m\u1ee5c)\">RDP<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/road-construction\/\" class=\"tag-cloud-link tag-link-197 tag-link-position-37\" style=\"font-size: 8pt;\" aria-label=\"road construction (1 m\u1ee5c)\">road construction<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/saturation-point\/\" class=\"tag-cloud-link tag-link-200 tag-link-position-38\" style=\"font-size: 8pt;\" aria-label=\"saturation point (1 m\u1ee5c)\">saturation point<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/skim-coat\/\" class=\"tag-cloud-link tag-link-191 tag-link-position-39\" style=\"font-size: 8pt;\" aria-label=\"skim coat (1 m\u1ee5c)\">skim coat<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/chat-sieu-deo\/\" class=\"tag-cloud-link tag-link-151 tag-link-position-40\" style=\"font-size: 14.3pt;\" aria-label=\"superplasticizer (2 m\u1ee5c)\">superplasticizer<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/keo-cha-ron-gach\/\" class=\"tag-cloud-link tag-link-172 tag-link-position-41\" style=\"font-size: 14.3pt;\" aria-label=\"tile grout (2 m\u1ee5c)\">tile grout<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/lap-dat-gach\/\" class=\"tag-cloud-link tag-link-176 tag-link-position-42\" style=\"font-size: 14.3pt;\" aria-label=\"tile installation (2 m\u1ee5c)\">tile installation<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/vae\/\" class=\"tag-cloud-link tag-link-186 tag-link-position-43\" style=\"font-size: 14.3pt;\" aria-label=\"VAE (2 m\u1ee5c)\">VAE<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/bot-tret-tuong\/\" class=\"tag-cloud-link tag-link-192 tag-link-position-44\" style=\"font-size: 8pt;\" aria-label=\"wall putty (1 m\u1ee5c)\">wall putty<\/a>\n<a href=\"https:\/\/michemicals.com\/vi\/the\/chat-giam-nuoc\/\" class=\"tag-cloud-link tag-link-152 tag-link-position-45\" style=\"font-size: 14.3pt;\" aria-label=\"water reducer (2 m\u1ee5c)\">water reducer<\/a><\/div>\n\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\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<div class=\"elementor-element elementor-element-543d4bba e-flex e-con-boxed e-con e-parent\" data-id=\"543d4bba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\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 Gypsum (calcium sulfate hemihydrate, CaSO\u2084\u00b70.5H\u2082O) is one of the most widely used binders in construction \u2014 powering machine-applied plasters, joint fillers, self-leveling underlayments, and the global plasterboard industry. When mixed with water, gypsum plaster rehydrates to form calcium sulfate dihydrate (CaSO\u2084\u00b72H\u2082O), setting into a hard, white, smooth surface. But the natural setting time of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11089,"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":[139,188,202,203,204],"class_list":["post-11086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-calcium-formate","tag-construction-chemicals","tag-gypsum-accelerator","tag-plaster-setting","tag-plasterboard"],"_links":{"self":[{"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/posts\/11086","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/comments?post=11086"}],"version-history":[{"count":0,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/posts\/11086\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/media\/11089"}],"wp:attachment":[{"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/media?parent=11086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/categories?post=11086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michemicals.com\/vi\/wp-json\/wp\/v2\/tags?post=11086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}