{"id":10899,"date":"2026-06-17T07:22:44","date_gmt":"2026-06-17T07:22:44","guid":{"rendered":"https:\/\/michemicals.com\/?p=10899"},"modified":"2026-06-17T09:26:22","modified_gmt":"2026-06-17T09:26:22","slug":"hpmc-pour-mortier-de-platre","status":"publish","type":"post","link":"https:\/\/michemicals.com\/fr\/hpmc-pour-mortier-de-platre\/","title":{"rendered":"HPMC pour les enduits \u00e0 base de pl\u00e2tre : guide sur la r\u00e9tention d'eau, le temps ouvert et la maniabilit\u00e9"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"10899\" class=\"elementor elementor-10899\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-76d905e1 elementor-reverse-mobile elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"76d905e1\" 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\/fr\/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-40aa4612 e-flex e-con-boxed e-con e-parent\" data-id=\"40aa4612\" 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-51db5f06 e-con-full e-flex e-con e-child\" data-id=\"51db5f06\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-4879454e e-con-full e-flex e-con e-child\" data-id=\"4879454e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-716acbd6 elementor-widget elementor-widget-heading\" data-id=\"716acbd6\" 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-3a4573a9 elementor-widget elementor-widget-text-editor\" data-id=\"3a4573a9\" 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-based interior plasters have surged in popularity across India, the Middle East, and Southeast Asia due to their\u00a0<strong>fast setting, smooth finish, and excellent fire resistance<\/strong>. However, gypsum mortars present a unique challenge: the setting reaction is faster and more moisture-sensitive than cement systems. Without proper rheological control, gypsum plaster suffers from poor water retention, premature stiffening, and weak adhesion.<\/p><p><strong>Hydroxypropyl Methylcellulose (HPMC)<\/strong>\u00a0is the cellulose ether of choice for gypsum-based systems \u2014 functioning simultaneously as a water retention agent, thickener, workability enhancer, and slip resistance modifier. This guide covers everything a dry mix mortar manufacturer needs to know to optimize HPMC use in gypsum plasters.<\/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-513cc0d5 e-flex e-con-boxed e-con e-parent\" data-id=\"513cc0d5\" 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-37a447bf e-con-full e-flex e-con e-child\" data-id=\"37a447bf\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-266cdb74 e-con-full e-flex e-con e-child\" data-id=\"266cdb74\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6508508b e-con-full e-flex e-con e-child\" data-id=\"6508508b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-404dca31 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"404dca31\" 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__404dca31\" 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__404dca31\" 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__404dca31\" 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-a3a0c43 elementor-widget elementor-widget-text-editor\" data-id=\"a3a0c43\" 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>1. Why Gypsum Plasters Need HPMC<\/h2><p>Gypsum (CaSO\u2084\u00b7\u00bdH\u2082O) reacts with water rapidly via:<\/p><blockquote><p>CaSO\u2084\u00b7\u00bdH\u2082O + 1\u00bdH\u2082O \u2192 CaSO\u2084\u00b72H\u2082O + heat<\/p><\/blockquote><p>This exothermic reaction completes in\u00a0<strong>15\u201340 minutes<\/strong>\u00a0under normal conditions. Without water retention control, the substrate (typically concrete block or AAC panels) absorbs the mixing water before gypsum hydration is complete \u2014 resulting in:<\/p><ul><li><strong>Premature stiffening<\/strong>\u00a0and application difficulty<\/li><li><strong>Incomplete hydration<\/strong>\u00a0\u2192 reduced strength<\/li><li><strong>Weak adhesion<\/strong>\u00a0due to dry-out at the interface<\/li><li><strong>Surface cracks<\/strong>\u00a0from moisture gradient<\/li><\/ul><p>HPMC addresses all these problems simultaneously.<\/p><hr \/><h2>2. Mechanism of HPMC in Gypsum Systems<\/h2><h3>2.1 Water Retention<\/h3><p>HPMC dissolves in the mixing water, forming a viscous hydrogel that\u00a0<strong>holds moisture within the mortar matrix<\/strong>. This ensures:<\/p><ul><li>Gypsum hydration proceeds fully and uniformly<\/li><li>The plaster remains workable for the desired open time (typically 30\u201360 minutes for hand application)<\/li><\/ul><h3>2.2 Thickening and Anti-Sag<\/h3><p>The viscosity contributed by HPMC prevents the plaster from sagging on vertical surfaces. For machine-applied systems, lower viscosity grades are used to maintain pumpability while providing just enough sag resistance.<\/p><h3>2.3 Slip Resistance (Consistency)<\/h3><p>HPMC imparts a smooth, buttery consistency \u2014 making the plaster easy to spread with a steel trowel and reducing physical fatigue for applicators.<\/p><h3>2.4 Retardation Effect<\/h3><p>HPMC slightly retards gypsum setting by ~5\u201315%, providing additional buffer time. However, dedicated retarders (citric acid, tartaric acid) are still required for open times beyond 60 minutes.<\/p><hr \/><h2>3. HPMC Viscosity Grade Selection for Gypsum Plaster<\/h2><table><thead><tr><th>Application<\/th><th>Michem HPMC Grade<\/th><th>Viscosity (cP)<\/th><th>Dosage (% by weight)<\/th><th>Effect<\/th><\/tr><\/thead><tbody><tr><td>Machine-applied gypsum plaster<\/td><td>MH04K<\/td><td>~4,000<\/td><td>0.15\u20130.25%<\/td><td>Good water retention; pumpable<\/td><\/tr><tr><td>Hand-applied gypsum finish<\/td><td>MH75K<\/td><td>~75,000<\/td><td>0.20\u20130.35%<\/td><td>Extended open time; smooth troweling<\/td><\/tr><tr><td>Thick-coat gypsum basecoat (&gt; 10mm)<\/td><td>MH100K \/ MH150K<\/td><td>100,000\u2013150,000<\/td><td>0.25\u20130.40%<\/td><td>Maximum sag resistance; anti-slump<\/td><\/tr><tr><td>Gypsum board joint compound<\/td><td>MH75K<\/td><td>~75,000<\/td><td>0.30\u20130.50%<\/td><td>Smooth flow; no cracking on drying<\/td><\/tr><\/tbody><\/table><p><em>Viscosity measured at 2% solution, 20\u00b0C, Brookfield RV spindle 3, 20 rpm.<\/em><\/p><hr \/><h2>4. Water Retention Test Results<\/h2><p>Water retention is measured per\u00a0<strong>EN 459-2<\/strong>\u00a0or\u00a0<strong>ASTM C91<\/strong>\u00a0filter paper method.<\/p><table><thead><tr><th>HPMC Grade<\/th><th>Dosage<\/th><th>Water Retention (%)<\/th><th>Open Time (min)<\/th><\/tr><\/thead><tbody><tr><td>No HPMC (control)<\/td><td>0<\/td><td>64%<\/td><td>&lt; 10 min<\/td><\/tr><tr><td>Michem MH75K (~75,000 cP)<\/td><td>0.20%<\/td><td>88%<\/td><td>28 min<\/td><\/tr><tr><td>Michem MH75K<\/td><td>0.30%<\/td><td>92%<\/td><td>42 min<\/td><\/tr><tr><td>Michem MH100K (~100,000 cP)<\/td><td>0.20%<\/td><td>91%<\/td><td>35 min<\/td><\/tr><tr><td>Michem MH100K<\/td><td>0.30%<\/td><td>95%<\/td><td>52 min<\/td><\/tr><tr><td>Michem MH200K (~200,000 cP)<\/td><td>0.25%<\/td><td>96%<\/td><td>65 min<\/td><\/tr><\/tbody><\/table><p><em>Test conditions: EN 13279, gypsum plaster B3, applied on AAC block substrate (absorption 15%), 23\u00b0C\/50% RH.<\/em><\/p><hr \/><h2>5. Gypsum Plaster Formulation Examples<\/h2><h3>5.1 Hand-Applied Gypsum Finish Plaster (Interior Walls)<\/h3><table><thead><tr><th>Component<\/th><th>% by Weight<\/th><\/tr><\/thead><tbody><tr><td>Hemihydrate Gypsum (\u03b2-type)<\/td><td>80\u201385<\/td><\/tr><tr><td>Limestone Powder (D50: 40 \u03bcm)<\/td><td>10\u201315<\/td><\/tr><tr><td>Michem HPMC MH100K (100,000 cP)<\/td><td>0.25\u20130.35<\/td><\/tr><tr><td>Gypsum Retarder (sodium citrate)<\/td><td>0.03\u20130.06<\/td><\/tr><tr><td>Starch Ether<\/td><td>0.05\u20130.10<\/td><\/tr><tr><td>PP Anti-crack Fiber (3mm, 6mm)<\/td><td>0.03\u20130.05<\/td><\/tr><\/tbody><\/table><p><em>W\/P Ratio: 0.55\u20130.65 | Setting Time: 45\u201375 min | Flexural Strength: \u2265 2.0 MPa (28d)<\/em><\/p><h3>5.2 Machine-Applied Gypsum Basecoat<\/h3><table><thead><tr><th>Component<\/th><th>% by Weight<\/th><\/tr><\/thead><tbody><tr><td>Hemihydrate Gypsum (\u03b2-type)<\/td><td>72\u201378<\/td><\/tr><tr><td>Quartz Sand (0.1\u20130.4 mm)<\/td><td>15\u201320<\/td><\/tr><tr><td>Michem HPMC MH04K (~4,000 cP)<\/td><td>0.15\u20130.22<\/td><\/tr><tr><td>Gypsum Retarder<\/td><td>0.05\u20130.10<\/td><\/tr><tr><td>Starch Ether<\/td><td>0.04\u20130.08<\/td><\/tr><tr><td>Perlite (expanded, 0.5\u20132mm)<\/td><td>0\u20135 (optional, lightweight)<\/td><\/tr><\/tbody><\/table><p><em>Pumping pressure: \u2264 12 bar | W\/P Ratio: 0.58\u20130.68 | Adhesion: \u2265 0.3 MPa<\/em><\/p><h3>5.3 High-Performance Gypsum Plaster for Humid Areas<\/h3><table><thead><tr><th>Component<\/th><th>% by Weight<\/th><\/tr><\/thead><tbody><tr><td>\u03b1-Hemihydrate Gypsum<\/td><td>60\u201370<\/td><\/tr><tr><td>\u03b2-Hemihydrate Gypsum<\/td><td>15\u201320<\/td><\/tr><tr><td>Calcium Carbonate<\/td><td>10\u201315<\/td><\/tr><tr><td>Michem HPMC MH100K<\/td><td>0.30\u20130.40<\/td><\/tr><tr><td>Silicone Emulsion (hydrophobic)<\/td><td>0.5\u20131.0<\/td><\/tr><tr><td>Retarder<\/td><td>0.05\u20130.08<\/td><\/tr><\/tbody><\/table><p><em>For bathrooms, kitchens, and GCC\/humid tropical applications<\/em><\/p><hr \/><h2>6. HPMC Substitution Level Effect on Gypsum Plaster<\/h2><p>A common mistake is using HPMC from different suppliers without accounting for viscosity grade differences. The following compares three equivalent dosage scenarios:<\/p><table><thead><tr><th>Scenario<\/th><th>HPMC Grade<\/th><th>Dosage<\/th><th>Water Retention<\/th><th>Consistency<\/th><th>Compressive Strength (7d)<\/th><\/tr><\/thead><tbody><tr><td>Low viscosity, standard dose<\/td><td>MH04K (~4,000 cP)<\/td><td>0.30%<\/td><td>89%<\/td><td>Soft, easy trowel<\/td><td>6.2 MPa<\/td><\/tr><tr><td>Medium viscosity, standard dose<\/td><td>MH100K (~100,000 cP)<\/td><td>0.25%<\/td><td>94%<\/td><td>Firm, sag-resistant<\/td><td>6.8 MPa<\/td><\/tr><tr><td>High viscosity, reduced dose<\/td><td>MH200K (~200,000 cP)<\/td><td>0.15%<\/td><td>91%<\/td><td>Slightly stiff<\/td><td>6.5 MPa<\/td><\/tr><tr><td>High viscosity, over-dose<\/td><td>MH200K (~200,000 cP)<\/td><td>0.40%<\/td><td>97%<\/td><td>Very stiff, balling<\/td><td>5.9 MPa<\/td><\/tr><\/tbody><\/table><p><strong>Takeaway:<\/strong>\u00a0Over-dosing high-viscosity HPMC reduces compressive strength by forming excessive water-retention gel that dilutes the gypsum matrix. Match viscosity grade to dosage carefully.<\/p><hr \/><h2>7. Market Perspective: HPMC in Gypsum Plaster<\/h2><h3>India<\/h3><ul><li>Gypsum plaster market growing at\u00a0<strong>8.5% CAGR<\/strong>\u00a0(2023\u20132028), driven by rapid urbanization and preference over sand-cement in interior finishing<\/li><li>Key states: Maharashtra, Tamil Nadu, Telangana, Gujarat<\/li><li>MH75K to MH100K grades preferred; machine application gaining share in commercial projects<\/li><li>IS 2542 (Gypsum Plaster) compliance required<\/li><\/ul><h3>Saudi Arabia \/ UAE (GCC)<\/h3><ul><li>Machine-applied gypsum plaster standard for apartment and hospitality construction<\/li><li>Extreme heat increases substrate absorption \u2192 higher HPMC dosage needed (0.30\u20130.40%)<\/li><li>\u03b1-Gypsum preferred for its higher strength in humid coastal areas (Jeddah, Dubai)<\/li><li>SASO 17 (Gypsum Products) compliance<\/li><\/ul><h3>Brazil<\/h3><ul><li>Growing adoption in residential construction as substitute for traditional &#8220;reboco&#8221; cement plaster<\/li><li>NBR 13207 (Gypsum Plaster) standard<\/li><li>High humidity in coastal cities requires hydrophobic modification at higher HPMC doses<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1e45de0 elementor-widget elementor-widget-heading\" data-id=\"1e45de0\" 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\">8. Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2e0396 elementor-widget elementor-widget-accordion\" data-id=\"c2e0396\" 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-2041\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-2041\" 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 best HPMC viscosity for gypsum plaster? <\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2041\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-2041\"><p>\u00a0For hand application, 60,000\u2013100,000 cP provides the best balance of water retention and workability. For machine application via spray or pump, 15,000\u201340,000 cP reduces pumping pressure while maintaining adequate water retention.<\/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-2042\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-2042\" 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 HPMC affect gypsum setting time? <\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2042\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-2042\"><p>HPMC has a mild retarding effect \u2014 typically extending initial set by 5\u201315%. For significant retardation (&gt; 1 hour), use dedicated retarders such as sodium citrate (0.03\u20130.10%) in combination with HPMC.<\/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-2043\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-2043\" 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 HPMC replace starch ether in gypsum plaster?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2043\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-2043\"><p>They serve complementary functions. HPMC provides water retention and thickening; starch ether provides additional anti-sag, stickiness improvement, and surface smoothness. Best results use both at low combined dosage (0.30% HPMC + 0.05\u20130.10% starch ether).<\/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-2044\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-2044\" 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 use too much HPMC in gypsum plaster? <\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2044\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-2044\"><p>Over-dosing (&gt; 0.45%) leads to excessive viscosity, balling during mixing, reduced compressive strength, and surface defects such as &#8220;pilling.&#8221; Always stay within the recommended range for your viscosity grade.<\/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-2045\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-2045\" 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\">Is Michem HPMC suitable for \u03b1-gypsum systems?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2045\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-2045\"><p>Yes. Michem MH series is compatible with both \u03b1- and \u03b2-hemihydrate gypsum. For \u03b1-gypsum (higher density, lower W\/P ratio ~0.35\u20130.45), use slightly lower dosage (0.15\u20130.25%) to avoid over-thickening.<\/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-11332fb elementor-widget elementor-widget-text-editor\" data-id=\"11332fb\" 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>Elevate Your Gypsum Plaster Formulation<\/h2><p>Michem supplies <strong>HPMC cellulose ether<\/strong> (MH-100K through MH-200K grades) to dry mix mortar manufacturers, gypsum product companies, and construction chemical distributors in India, GCC, and global markets.<\/p><p>\ud83d\udce7\u00a0<strong>Request samples, TDS, and SDS:<\/strong>\u00a0\ud83d\udc49\u00a0<a href=\"https:\/\/michemicals.com\/contact-us\" target=\"_blank\" rel=\"noopener noreferrer\">Contact Michem at 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78.784-7.735 12.413-16.994 23.317-25.851 33.253l-.131.146-.129.148C135.662 161.807 127.764 168 120.8 168h-2.679c-5.747-4.952-13.536-8-22.12-8H32c-17.673 0-32 12.894-32 28.8v230.4C0 435.106 14.327 448 32 448h64c8.584 0 16.373-3.048 22.12-8h2.679c28.688 0 67.137 40 127.2 40h21.299c62.542 0 98.8-38.658 99.94-91.145 12.482-17.813 18.491-40.785 15.985-62.791A93.148 93.148 0 0 0 393.152 304H428.8c45.435 0 83.2-37.584 83.2-83.2 0-45.099-38.101-83.2-83.2-83.2zm0 118.4h-91.026c12.837 14.669 14.415 42.825-4.95 61.05 11.227 19.646 1.687 45.624-12.925 53.625 6.524 39.128-10.076 61.325-50.6 61.325H248c-45.491 0-77.21-35.913-120-39.676V215.571c25.239-2.964 42.966-21.222 59.075-39.596 11.275-12.65 21.725-25.3 30.799-39.875C232.355 112.712 244.006 80 252.8 80c23.375 0 44 8.8 44 35.2 0 35.2-26.4 53.075-26.4 70.4h158.4c18.425 0 35.2 16.5 35.2 35.2 0 18.975-16.225 35.2-35.2 35.2zM88 384c0 13.255-10.745 24-24 24s-24-10.745-24-24 10.745-24 24-24 24 10.745 24 24z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Contact Us<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1a932464 elementor-widget elementor-widget-text-editor\" data-id=\"1a932464\" 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-37ab26e2 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"37ab26e2\" data-element_type=\"widget\" data-e-type=\"widget\" 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placeholder=\"Message\"><\/textarea>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-group elementor-column elementor-field-type-submit elementor-col-100 e-form__buttons\">\n\t\t\t\t\t<button class=\"elementor-button elementor-size-sm\" type=\"submit\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-double-right\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34zm192-34l-136-136c-9.4-9.4-24.6-9.4-33.9 0l-22.6 22.6c-9.4 9.4-9.4 24.6 0 33.9l96.4 96.4-96.4 96.4c-9.4 9.4-9.4 24.6 0 33.9l22.6 22.6c9.4 9.4 24.6 9.4 33.9 0l136-136c9.4-9.2 9.4-24.4 0-33.8z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Send Inquiry Now<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/form>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Introduction Gypsum-based interior plasters have surged in popularity across India, the Middle East, and Southeast Asia due to their\u00a0fast setting, smooth finish, and excellent fire resistance. However, gypsum mortars present a unique challenge: the setting reaction is faster and more moisture-sensitive than cement systems. Without proper rheological control, gypsum plaster suffers from poor water retention, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10902,"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":[],"class_list":["post-10899","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/posts\/10899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/comments?post=10899"}],"version-history":[{"count":8,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/posts\/10899\/revisions"}],"predecessor-version":[{"id":10930,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/posts\/10899\/revisions\/10930"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/media\/10902"}],"wp:attachment":[{"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/media?parent=10899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/categories?post=10899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michemicals.com\/fr\/wp-json\/wp\/v2\/tags?post=10899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}