{"id":11528,"date":"2026-07-15T03:32:23","date_gmt":"2026-07-15T03:32:23","guid":{"rendered":"https:\/\/michemicals.com\/?p=11528"},"modified":"2026-07-15T03:37:41","modified_gmt":"2026-07-15T03:37:41","slug":"retencion-de-agua-cmc-frente-a-hpmc","status":"publish","type":"post","link":"https:\/\/michemicals.com\/es\/retencion-de-agua-cmc-frente-a-hpmc\/","title":{"rendered":"Retenci\u00f3n de agua del CMC frente al HPMC: \u00bfqu\u00e9 \u00e9ter de celulosa retiene m\u00e1s agua en el mortero?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"11528\" class=\"elementor elementor-11528\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-77dce34b elementor-reverse-mobile elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"77dce34b\" 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-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2f783f76\" data-id=\"2f783f76\" 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-4c1d0970 elementor-align-left elementor-widget elementor-widget-post-info\" data-id=\"4c1d0970\" 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-2770981 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/es\/2026\/07\/15\/\">\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-week\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0 464c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V192H0v272zm64-192c0-8.8 7.2-16 16-16h288c8.8 0 16 7.2 16 16v64c0 8.8-7.2 16-16 16H80c-8.8 0-16-7.2-16-16v-64zM400 64h-48V16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v48H160V16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v48H48C21.5 64 0 85.5 0 112v48h448v-48c0-26.5-21.5-48-48-48z\"><\/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>julio 15, 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-6cd1462 elementor-inline-item\" itemprop=\"author\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/es\/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-2e0fbb74 e-flex e-con-boxed e-con e-parent\" data-id=\"2e0fbb74\" 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-50aa0865 e-con-full e-flex e-con e-child\" data-id=\"50aa0865\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-14e1f8ab e-con-full e-flex e-con e-child\" data-id=\"14e1f8ab\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4b901fde elementor-widget elementor-widget-heading\" data-id=\"4b901fde\" 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-41842e9e elementor-widget elementor-widget-text-editor\" data-id=\"41842e9e\" 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>HPMC retains more water than CMC in most cement-based mortar systems \u2014 typically achieving 85\u201395% water retention versus CMC&#8217;s 70\u201385% at equivalent dosage \u2014 because HPMC&#8217;s mixed methoxyl\/hydroxypropoxyl substitution creates a more effective hydration shell and superior film-forming ability that resists the highly alkaline cement pore environment. HPMC is non-ionic; it maintains its hydrodynamic volume and thickening efficiency at cement hydration pH (12.5\u201313.5) where CMC, an anionic ether, progressively precipitates as calcium carboxymethyl cellulose, collapsing viscosity and releasing retained water.<br \/>However, CMC achieves adequate water retention (70\u201385%) at significantly lower cost and is fully sufficient for gypsum-based and low-demand mortar applications where the system pH stays neutral (6\u20138). In gypsum plasters, CMC at 0.15\u20130.25% dosage performs comparably to HPMC at 0.05\u20130.10%, and its per-kilogram cost is typically 30\u201350% below construction-grade HPMC. For formulators managing cost-sensitive interior products, CMC delivers a practical water-retention solution. The selection decision is not universal \u2014 it is application-specific: HPMC for cement-based mortars where high retention is structurally critical, CMC for gypsum and interior systems where adequate retention at lower cost meets performance requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e72bc5 elementor-widget elementor-widget-post-info\" data-id=\"3e72bc5\" 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-5aada5c 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\/es\/etiqueta\/cmc-frente-a-hpmc\/\" class=\"elementor-post-info__terms-list-item\">cmc vs hpmc<\/a>, <a href=\"https:\/\/michemicals.com\/es\/etiqueta\/retencion-de-agua-del-cmc\/\" class=\"elementor-post-info__terms-list-item\">CMC Water Retention<\/a>, <a href=\"https:\/\/michemicals.com\/es\/etiqueta\/hpmc-water-retention\/\" class=\"elementor-post-info__terms-list-item\">HPMC Water Retention<\/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>\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-2ef25d1f e-flex e-con-boxed e-con e-parent\" data-id=\"2ef25d1f\" 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-30187fd2 e-con-full e-flex e-con e-child\" data-id=\"30187fd2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-cc7c729 e-con-full e-flex e-con e-child\" data-id=\"cc7c729\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-243d4007 e-con-full e-flex e-con e-child\" data-id=\"243d4007\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7c504872 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"7c504872\" 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__7c504872\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><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__7c504872\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><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__7c504872\" 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-44fccdb elementor-widget elementor-widget-text-editor\" data-id=\"44fccdb\" 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><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-11534\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HPMC-retains-more-water-than-CMC-in-most-cement-based-mortar-systems.webp\" alt=\"HPMC retains more water than CMC in most cement-based mortar systems\" width=\"1000\" height=\"562\" title=\"\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HPMC-retains-more-water-than-CMC-in-most-cement-based-mortar-systems.webp 1000w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HPMC-retains-more-water-than-CMC-in-most-cement-based-mortar-systems-300x169.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HPMC-retains-more-water-than-CMC-in-most-cement-based-mortar-systems-768x432.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/HPMC-retains-more-water-than-CMC-in-most-cement-based-mortar-systems-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><h2>Key Takeaways<\/h2><ul><li><strong>HPMC achieves higher water retention (85\u201395%) in cement-based mortars<\/strong> due to its non-ionic chemistry that resists calcium-induced viscosity collapse, versus CMC&#8217;s 70\u201385% under identical conditions.<\/li><\/ul><ul><li><strong>CMC costs 30\u201350% less per kilogram than HPMC<\/strong> and delivers adequate water retention in gypsum-based and neutral-pH mortar systems where its anionic limitation does not apply.<\/li><\/ul><ul><li><strong>Selection is application-specific<\/strong>: HPMC for tile adhesives, EIFS, waterproofing, and exterior renders; CMC for gypsum plaster, interior wall putty, and masonry mortar.<\/li><\/ul><ul><li><strong>Dosage equivalence matters<\/strong>: CMC requires 1.5\u00d7 to 3\u00d7 higher dosage to approach HPMC water retention levels in cement systems, partially offsetting its per-kilogram cost advantage.<\/li><\/ul><ul><li><strong>DS impacts CMC retention<\/strong>: Higher degree of substitution (0.8\u20130.9) improves CMC solubility and offers modestly better resistance to calcium precipitation compared to lower DS (0.65\u20130.75), though it does not eliminate the fundamental cation sensitivity.<\/li><\/ul><hr \/><h2>Why This Answer Matters<\/h2><p>Water retention is the single most important function of cellulose ethers in dry-mix mortar. Without adequate water retention, mixing water dewaters into absorbent substrates or evaporates before cement hydrates, producing incomplete hydration, reduced bond strength, premature skinning, and shrinkage cracking. Tile delamination, hollow renders, and cracked skim coats are the visible failure modes \u2014 and they all trace back to insufficient water retention at the mortar-substrate interface.<\/p><p>Cellulose ethers typically exceed 30% of total additive spending in a dry-mix formulation. The choice between CMC and HPMC directly determines both performance reliability and additive cost. Over-specifying HPMC where CMC suffices wastes money; under-specifying with CMC where HPMC is needed risks job-site failure. Formulators who understand the quantitative retention gap and its root causes can make informed decisions that optimize cost without compromising critical performance \u2014 and this is precisely the decision that determines whether a mortar product succeeds or fails in the field.<\/p><hr \/><h2>Technical Deep Dive<\/h2><h3>Water Retention Mechanism: Physical Pore Plugging vs. Hydration Shell<\/h3><p>Cellulose ethers retain water in mortar through two concurrent mechanisms: <strong>physical pore plugging<\/strong> (swollen polymer chains occluding capillary pores to slow water migration) and <strong>solution viscosity increase<\/strong> (thickening the aqueous phase to reduce hydraulic conductivity toward absorbent substrates). Both mechanisms depend on the polymer maintaining its dissolved, swollen state throughout the mortar&#8217;s working life \u2014 typically 20\u201330 minutes for tile adhesive application.<\/p><p>HPMC&#8217;s mixed methoxyl\/hydroxypropoxyl substituents create a more effective hydration shell around each polymer chain. The methoxyl groups (19\u201324%) reduce hydrogen bonding between chains, promoting individual chain extension and maximizing the hydrodynamic volume per unit mass. The hydroxypropoxyl groups (4\u201312%) introduce hydrophilic side chains that strengthen water binding. Together, these substituents give HPMC superior water-holding capacity per molecule compared to CMC&#8217;s carboxymethyl groups alone.<\/p><p>CMC&#8217;s carboxymethyl groups (-CH\u2082COONa) provide strong initial thickening \u2014 the anionic charge creates electrostatic repulsion between chains, expanding hydrodynamic volume at low concentrations. However, this advantage collapses in cement systems. Dissolved Ca\u00b2\u207a ions from cement hydration bind to carboxylate groups, neutralizing electrostatic repulsion and forming calcium carboxymethyl cellulose complexes that reduce chain extension, collapse viscosity, and release previously retained water.<\/p><h3>Substitution Chemistry: Why the Gap Exists<\/h3><p>The fundamental retention gap originates from ionic character. HPMC carries only neutral methoxyl and hydroxypropoxyl substituents \u2014 no ionizable groups. Its thickening and water-holding performance are entirely physical, unaffected by pH, electrolyte concentration, or calcium ions. CMC carries ionizable carboxylate groups that drive both its cost advantage (sodium monochloroacetate is cheaper than the methyl chloride\/propylene oxide combination used for HPMC) and its performance limitation (ion sensitivity in alkaline cement environments).<\/p><p>In gypsum-based systems (pH 6\u20138), Ca\u00b2\u207a concentration remains low, and CMC&#8217;s carboxylate groups stay fully ionized, maintaining chain extension and thickening efficiency. This is why CMC performs comparably to HPMC in gypsum plaster and joint compound \u2014 the chemistry that limits CMC in cement simply does not activate.<\/p><h3>Experimental Data: Quantifying the Retention Gap<\/h3><p>Using the filter paper method (EN 413-2 modified) at 20 minutes, typical results for a cement tile adhesive formulation (35% OPC, 65% sand) are:<\/p><table><tbody><tr><td><p>Cellulose Ether<\/p><\/td><td><p>Dosage<\/p><\/td><td><p>Water Retention (%)<\/p><\/td><\/tr><tr><td><p>Michem HPMC MH100K<\/p><\/td><td><p>0.05%<\/p><\/td><td><p>92<\/p><\/td><\/tr><tr><td><p>Michem HPMC MH100K<\/p><\/td><td><p>0.03%<\/p><\/td><td><p>88<\/p><\/td><\/tr><tr><td><p><a href=\"https:\/\/michemicals.com\/cellulose-ether\/carboxymethyl-cellulose\/\">Michem CMC<\/a> (DS 0.8)<\/p><\/td><td><p>0.05%<\/p><\/td><td><p>68\u201372<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.8)<\/p><\/td><td><p>0.10%<\/p><\/td><td><p>75\u201378<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.8)<\/p><\/td><td><p>0.15%<\/p><\/td><td><p>80\u201383<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.65)<\/p><\/td><td><p>0.05%<\/p><\/td><td><p>62\u201365<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.65)<\/p><\/td><td><p>0.10%<\/p><\/td><td><p>70\u201373<\/p><\/td><\/tr><\/tbody><\/table><p>In a gypsum plaster formulation (75% hemihydrate, 25% filler), results shift significantly:<\/p><table><tbody><tr><td><p>Cellulose Ether<\/p><\/td><td><p>Dosage<\/p><\/td><td><p>Water Retention (%)<\/p><\/td><\/tr><tr><td><p>Michem HPMC MH75K<\/p><\/td><td><p>0.05%<\/p><\/td><td><p>91<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.8)<\/p><\/td><td><p>0.10%<\/p><\/td><td><p>88\u201390<\/p><\/td><\/tr><tr><td><p>Michem CMC (DS 0.8)<\/p><\/td><td><p>0.15%<\/p><\/td><td><p>92\u201394<\/p><\/td><\/tr><\/tbody><\/table><p>The gypsum data confirms that CMC&#8217;s anionic chemistry is not inherently inferior \u2014 it is environment-dependent. Where Ca\u00b2\u207a concentration is low and pH is neutral, CMC approaches HPMC performance at roughly 2\u00d7 dosage.<\/p><h3>Cost-per-Performance Analysis<\/h3><p>Assume construction-grade HPMC at USD 3.50\/kg and CMC at USD 1.80\/kg (representative market pricing, 30\u201350% spread). For a cement tile adhesive requiring \u226590% water retention:<\/p><ul><li><strong>HPMC MH100K at 0.05%<\/strong> \u2192 USD 1.75\/ton of dry mix \u2192 meets \u226590% target<\/li><\/ul><ul><li><strong>CMC at 0.15%<\/strong> \u2192 USD 2.70\/ton of dry mix \u2192 achieves only 80\u201383%, misses target<\/li><\/ul><p>In this scenario, CMC costs more per ton of dry mix <em>and<\/em> fails the performance requirement. HPMC is both cheaper in use and higher-performing.<\/p><p>For gypsum plaster requiring \u226588% water retention:<\/p><ul><li><strong>HPMC MH75K at 0.05%<\/strong> \u2192 USD 1.75\/ton \u2192 meets target<\/li><\/ul><ul><li><strong>CMC (DS 0.8) at 0.10%<\/strong> \u2192 USD 1.80\/ton \u2192 meets target (88\u201390%)<\/li><\/ul><p>In gypsum, CMC delivers equivalent performance at essentially the same cost-in-use, with the added advantage of rapid cold-water solubility and no thermal gelation interference with gypsum setting.<\/p><h3>DS Impact on CMC Water Retention<\/h3><p>Degree of substitution directly affects CMC retention performance. Higher DS (0.8\u20130.9) means more carboxymethyl groups per anhydroglucose unit, which:<\/p><ul><li>Improves cold-water solubility and reduces fish-eye formation during mixing<\/li><\/ul><ul><li>Increases electrostatic repulsion between chains at neutral pH, enhancing initial thickening<\/li><\/ul><ul><li>Provides modestly better resistance to calcium precipitation by distributing the charge density<\/li><\/ul><p>However, DS improvement is incremental, not transformative. Moving from DS 0.65 to DS 0.9 improves water retention by approximately 5\u20138 percentage points in cement systems at the same dosage \u2014 a meaningful gain but insufficient to close the 15\u201325 percentage point gap with HPMC. For gypsum systems, the DS effect is smaller (2\u20133 percentage points) because calcium interference is minimal.<\/p><hr \/><h2>Product Specifications<\/h2><h3>Michem CMC (<a href=\"https:\/\/michemicals.com\/cellulose-ether\/carboxymethyl-cellulose\/\">Carboxymethyl Cellulose,<\/a> CAS 9004-32-4)<\/h3><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Specification<\/p><\/td><\/tr><tr><td><p>CAS Number<\/p><\/td><td><p>9004-32-4<\/p><\/td><\/tr><tr><td><p>Degree of Substitution (DS)<\/p><\/td><td><p>0.65\u20130.9<\/p><\/td><\/tr><tr><td><p>Purity<\/p><\/td><td><p>\u226599.5%<\/p><\/td><\/tr><tr><td><p>Chloride Content<\/p><\/td><td><p>\u22640.5%<\/p><\/td><\/tr><tr><td><p>Drying Loss<\/p><\/td><td><p>\u22648.0%<\/p><\/td><\/tr><tr><td><p>pH (1% solution)<\/p><\/td><td><p>6.5\u20138.5<\/p><\/td><\/tr><tr><td><p>Water Insoluble<\/p><\/td><td><p>\u22640.3%<\/p><\/td><\/tr><tr><td><p>Ionic Type<\/p><\/td><td><p>Anionic<\/p><\/td><\/tr><tr><td><p>Viscosity (Brookfield, 1% solution)<\/p><\/td><td><p>400\u20138,000 mPa\u00b7s (customizable)<\/p><\/td><\/tr><tr><td><p>Mortar Dosage<\/p><\/td><td><p>0.1%\u20130.3%<\/p><\/td><\/tr><\/tbody><\/table><p><em>Source: michemicals.com<\/em><\/p><h3>Michem HPMC (Hydroxypropyl Methyl Cellulose)<\/h3><table><tbody><tr><td><p>Grade<\/p><\/td><td><p>Viscosity (mPa\u00b7s)<\/p><\/td><td><p>Key Applications<\/p><\/td><\/tr><tr><td><p>MH04K<\/p><\/td><td><p>400\u2013500<\/p><\/td><td><p>Self-leveling compounds, flowable screeds<\/p><\/td><\/tr><tr><td><p>MH75K<\/p><\/td><td><p>35,000\u201340,000<\/p><\/td><td><p>Interior wall putty, gypsum plaster<\/p><\/td><\/tr><tr><td><p>MH100K<\/p><\/td><td><p>45,000\u201360,000<\/p><\/td><td><p>Standard tile adhesive (C1), general-purpose mortar<\/p><\/td><\/tr><tr><td><p>MH150K<\/p><\/td><td><p>55,000\u201365,000<\/p><\/td><td><p>High-performance tile adhesive (C2), repair mortar<\/p><\/td><\/tr><tr><td><p>MH200K<\/p><\/td><td><p>65,000\u201380,000<\/p><\/td><td><p>EIFS base coat, waterproofing mortar<\/p><\/td><\/tr><tr><td><p>MH200D<\/p><\/td><td><p>65,000\u201380,000<\/p><\/td><td><p>Extended open-time tile adhesive (C2E), hot-climate formulations<\/p><\/td><\/tr><\/tbody><\/table><p><strong>Additional HPMC Specifications:<\/strong><\/p><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Specification<\/p><\/td><\/tr><tr><td><p>Methoxyl Content<\/p><\/td><td><p>19\u201324%<\/p><\/td><\/tr><tr><td><p>Hydroxypropoxyl Content<\/p><\/td><td><p>4\u201312%<\/p><\/td><\/tr><tr><td><p>Moisture<\/p><\/td><td><p>\u22645%<\/p><\/td><\/tr><tr><td><p>Ash Content<\/p><\/td><td><p>\u22645%<\/p><\/td><\/tr><tr><td><p>pH (1% solution)<\/p><\/td><td><p>6\u20138<\/p><\/td><\/tr><tr><td><p>Gelation Temperature<\/p><\/td><td><p>60\u201370\u00b0C<\/p><\/td><\/tr><\/tbody><\/table><p><em>Source: michemicals.com<\/em><\/p><hr \/><h2>Practical Application Guide<\/h2><h3>When to Choose CMC for Water Retention<\/h3><p><strong>Gypsum-based plasters and joint compounds (pH 6\u20138).<\/strong> CMC at 0.10\u20130.20% dosage provides 88\u201392% water retention, comparable to HPMC. Gypsum&#8217;s neutral pH avoids CMC&#8217;s calcium sensitivity entirely. CMC&#8217;s rapid cold-water solubility also simplifies mixing protocols compared to HPMC&#8217;s thermal hydration requirement. This is CMC&#8217;s strongest application for water retention.<\/p><p><strong>Interior wall putty (cost-sensitive).<\/strong> Where price competition dominates specification, CMC at 0.15\u20130.25% fully replaces HPMC. Accept slightly reduced open time and marginally higher cracking risk. Not suitable for exterior use where moisture cycling demands HPMC&#8217;s film integrity.<\/p><p><strong>General-purpose masonry mortar (Type N).<\/strong> CMC at 0.10\u20130.20% with a small HPMC supplement (0.02\u20130.03%) provides workable rheology for non-structural, interior applications.<\/p><p><strong>Ceramic tile production (binder).<\/strong> Michem CMC is confirmed for ceramic bodies, glaze slips, and fancy glazes where its anionic character and film-forming ability support green strength and casting performance.<\/p><h3>When HPMC Is the Only Choice<\/h3><ul><li><strong>Tile adhesives (C1, C2, C2E):<\/strong> Water retention \u226590% at 20 minutes is a non-negotiable specification requirement. HPMC delivers; CMC cannot.<\/li><\/ul><ul><li><strong>EIFS base coats and adhesives:<\/strong> Exterior thermal insulation demands sustained water retention for full cement hydration under variable weather.<\/li><\/ul><ul><li><strong>Waterproofing mortars:<\/strong> Film integrity and crack resistance require HPMC&#8217;s non-ionic stability.<\/li><\/ul><ul><li><strong>Self-leveling underlayments:<\/strong> Controlled viscosity build-up through HPMC&#8217;s delayed hydration mechanism is essential for flow and leveling.<\/li><\/ul><ul><li><strong>Exterior renders and repair mortars:<\/strong> Absorbent substrates and variable climate conditions make HPMC&#8217;s consistent retention critical.<\/li><\/ul><h3>Dosage Comparison Table<\/h3><table><tbody><tr><td><p>Application<\/p><\/td><td><p>HPMC Dosage<\/p><\/td><td><p>CMC Dosage (if used)<\/p><\/td><td><p>CMC Feasibility<\/p><\/td><\/tr><tr><td><p>Tile adhesive (C1\/C2)<\/p><\/td><td><p>0.03\u20130.08%<\/p><\/td><td><p>Not recommended<\/p><\/td><td><p>Not feasible<\/p><\/td><\/tr><tr><td><p>Exterior wall putty<\/p><\/td><td><p>0.05\u20130.10%<\/p><\/td><td><p>Not recommended<\/p><\/td><td><p>Not feasible<\/p><\/td><\/tr><tr><td><p>Gypsum plaster<\/p><\/td><td><p>0.02\u20130.06%<\/p><\/td><td><p>0.10\u20130.20%<\/p><\/td><td><p>Fully feasible<\/p><\/td><\/tr><tr><td><p>Interior wall putty<\/p><\/td><td><p>0.04\u20130.08%<\/p><\/td><td><p>0.15\u20130.25%<\/p><\/td><td><p>Feasible (cost trade-off)<\/p><\/td><\/tr><tr><td><p>Masonry mortar (interior)<\/p><\/td><td><p>0.02\u20130.04%<\/p><\/td><td><p>0.10\u20130.20%<\/p><\/td><td><p>Feasible with HPMC supplement<\/p><\/td><\/tr><tr><td><p>EIFS base coat<\/p><\/td><td><p>0.06\u20130.12%<\/p><\/td><td><p>Not recommended<\/p><\/td><td><p>Not feasible<\/p><\/td><\/tr><tr><td><p>Self-leveling compound<\/p><\/td><td><p>0.02\u20130.05%<\/p><\/td><td><p>Not recommended<\/p><\/td><td><p>Not feasible<\/p><\/td><\/tr><\/tbody><\/table><h3>Optimization Strategy: Blended Systems<\/h3><p>For gypsum spray plaster, a 50:50 CMC\/HPMC blend at combined 0.30% dosage (0.15% each) achieves 15\u201320% cellulose ether cost reduction while maintaining workability and surface finish. The HPMC fraction provides film integrity and extended open time; the CMC fraction provides rapid thickening and cost reduction. This is the most cost-effective strategy where CMC can partially contribute to water retention without fully replacing HPMC.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d3eca2 elementor-widget elementor-widget-heading\" data-id=\"6d3eca2\" 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-711b593 elementor-widget elementor-widget-accordion\" data-id=\"711b593\" 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-1181\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1181\" 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 HPMC retain more water than CMC in cement mortar?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1181\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1181\"><p>HPMC is non-ionic \u2014 its methoxyl and hydroxypropoxyl substituents create a hydration shell that remains intact at cement pH (12.5\u201313.5) and in the presence of dissolved Ca\u00b2\u207a ions. CMC is anionic; its carboxylate groups bind Ca\u00b2\u207a, forming calcium carboxymethyl cellulose complexes that collapse the polymer chain extension and release retained water. This is a chemical limitation intrinsic to all anionic cellulose ethers in alkaline, calcium-rich environments.<\/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-1182\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1182\" 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 CMC ever match HPMC water retention?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1182\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1182\"><p>Yes, in gypsum-based systems. Gypsum&#8217;s neutral pH (6\u20138) and low Ca\u00b2\u207a concentration prevent CMC&#8217;s calcium-induced viscosity collapse. At 0.10\u20130.20% dosage, CMC achieves 88\u201392% water retention in gypsum plaster \u2014 comparable to HPMC. In cement systems, CMC cannot match HPMC even at 3\u00d7 dosage because calcium precipitation is irreversible under cement conditions.<\/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-1183\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1183\" 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 DS value should I choose for CMC in mortar?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1183\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1183\"><p>For construction applications, select DS 0.8\u20130.9 (upper range of Michem CMC specification). Higher DS improves cold-water solubility, reduces fish-eye formation, and provides 5\u20138 percentage points better water retention in cement systems compared to DS 0.65. In gypsum systems, the DS effect is smaller (2\u20133 points); either range works adequately.<\/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-1184\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1184\" 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 higher CMC viscosity mean better water retention?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1184\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1184\"><p>Marginally. Doubling CMC viscosity from 2,000 to 4,000 mPa\u00b7s gains only 3\u20135 percentage points of water retention in cement mortar. DS, mixing quality, and dosage are more impactful than raw viscosity for CMC&#8217;s water retention performance. For HPMC, viscosity grade selection is more significant because higher viscosity grades (MH150K\u2013MH200K) provide both higher solution viscosity and better film-forming capacity.<\/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-1185\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-1185\" 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 much cost savings can CMC deliver in gypsum plaster?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1185\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-1185\"><p>At representative pricing (CMC USD 1.80\/kg, HPMC USD 3.50\/kg), replacing HPMC MH75K at 0.05% with CMC at 0.10% in gypsum plaster reduces cellulose ether cost from USD 1.75\/ton to USD 1.80\/ton of dry mix \u2014 essentially equivalent cost-in-use while achieving comparable water retention. The real savings come in interior wall putty where CMC at 0.15\u20130.25% replaces HPMC at 0.04\u20130.08%, yielding 10\u201320% additive cost reduction per ton of dry mix.<\/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-832ddaa elementor-widget elementor-widget-text-editor\" data-id=\"832ddaa\" 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>HPMC retains more water than CMC in cement-based mortars \u2014 85\u201395% versus 70\u201385% \u2014 and this gap is chemically determined by HPMC&#8217;s non-ionic stability versus CMC&#8217;s anionic calcium sensitivity. In gypsum and neutral-pH systems, CMC achieves comparable retention at roughly 2\u00d7 dosage and delivers meaningful cost savings.<\/p><p>The correct decision framework is application-specific: use HPMC where cement-based high retention is structurally critical (tile adhesives, EIFS, waterproofing), use CMC where gypsum-based or interior applications allow its chemistry to perform without limitation, and consider blended systems where partial CMC substitution reduces cost while HPMC maintains critical performance.<\/p><p>Michem supplies both CMC and HPMC across the full viscosity and substitution range, with customizable grades and formulation support to help you select the right ether for each application.<\/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-1d975697 elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"1d975697\" data-element_type=\"widget\" data-e-type=\"widget\" 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8.5l114.3-114.9c4.7-4.7 4.7-12.2 0-16.9l-114.3-115c-7.6-7.6-20.5-2.2-20.5 8.5V212H140c-6.6 0-12 5.4-12 12v64c0 6.6 5.4 12 12 12z\"><\/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\">Product Applications<\/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-21c02eab elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"21c02eab\" 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-1ca80944 elementor-align-left elementor-widget elementor-widget-button\" data-id=\"1ca80944\" data-element_type=\"widget\" data-e-type=\"widget\" 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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 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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<\/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-6917b4c1 e-flex e-con-boxed e-con e-parent\" data-id=\"6917b4c1\" 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 HPMC retains more water than CMC in most cement-based mortar systems \u2014 typically achieving 85\u201395% water retention versus CMC&#8217;s 70\u201385% at equivalent dosage \u2014 because HPMC&#8217;s mixed methoxyl\/hydroxypropoxyl substitution creates a more effective hydration shell and superior film-forming ability that resists the highly alkaline cement pore environment. HPMC is non-ionic; it maintains its hydrodynamic [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11530,"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":[230,246,245],"class_list":["post-11528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cmc-vs-hpmc","tag-cmc-water-retention","tag-hpmc-water-retention"],"_links":{"self":[{"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/posts\/11528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/comments?post=11528"}],"version-history":[{"count":3,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/posts\/11528\/revisions"}],"predecessor-version":[{"id":11544,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/posts\/11528\/revisions\/11544"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/media\/11530"}],"wp:attachment":[{"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/media?parent=11528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/categories?post=11528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michemicals.com\/es\/wp-json\/wp\/v2\/tags?post=11528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}