{"id":11572,"date":"2026-07-17T05:31:20","date_gmt":"2026-07-17T05:31:20","guid":{"rendered":"https:\/\/michemicals.com\/?p=11572"},"modified":"2026-07-17T06:19:42","modified_gmt":"2026-07-17T06:19:42","slug":"%d9%83%d9%8a%d9%81%d9%8a%d8%a9-%d8%a7%d9%84%d8%aa%d8%ad%d9%82%d9%82-%d9%85%d9%86-%d8%b5%d8%ad%d8%a9-%d8%a7%d9%84%d9%83%d8%b1%d8%a8%d9%88%d9%83%d8%b3%d9%8a-%d9%85%d9%8a%d8%ab%d9%8a%d9%84-%d8%a7%d9%84","status":"publish","type":"post","link":"https:\/\/michemicals.com\/ar\/%d9%83%d9%8a%d9%81%d9%8a%d8%a9-%d8%a7%d9%84%d8%aa%d8%ad%d9%82%d9%82-%d9%85%d9%86-%d8%b5%d8%ad%d8%a9-%d8%a7%d9%84%d9%83%d8%b1%d8%a8%d9%88%d9%83%d8%b3%d9%8a-%d9%85%d9%8a%d8%ab%d9%8a%d9%84-%d8%a7%d9%84\/","title":{"rendered":"\u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u062c\u0648\u062f\u0629 \u0648\u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0641\u064a CMC: \u0643\u064a\u0641\u064a\u0629 \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u0635\u0644\u0627\u062d\u064a\u0629 \u0627\u0644\u0633\u0644\u064a\u0644\u0648\u0632 \u0627\u0644\u0643\u0631\u0628\u0648\u0643\u0633\u064a \u0645\u064a\u062b\u064a\u0644\u064a \u0644\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0641\u064a \u0645\u062c\u0627\u0644 \u0627\u0644\u0628\u0646\u0627\u0621"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"11572\" class=\"elementor elementor-11572\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5a476514 elementor-reverse-mobile elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5a476514\" 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 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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-13724359 e-flex e-con-boxed e-con e-parent\" data-id=\"13724359\" 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-563a1a08 e-con-full e-flex e-con e-child\" data-id=\"563a1a08\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-3ab15d63 e-con-full e-flex e-con e-child\" data-id=\"3ab15d63\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7fd1f043 elementor-widget elementor-widget-heading\" data-id=\"7fd1f043\" 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-57bb5ce6 elementor-widget elementor-widget-text-editor\" data-id=\"57bb5ce6\" 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>To verify CMC (Carboxymethyl Cellulose) quality for construction applications, test five critical parameters: <strong>degree of substitution (DS 0.65\u20130.9 via acid-base titration)<\/strong>, <strong>purity (\u226599.5% by gravimetric analysis)<\/strong>, <strong>viscosity (400\u20138,000 mPa\u00b7s at specified concentration via Brookfield)<\/strong>, <strong>chloride content (\u22640.5%)<\/strong>, and <strong>water insoluble matter (\u22640.3%)<\/strong>. These five tests confirm whether CMC meets the Michem specification for construction mortar use.<\/p><p>Begin with DS determination \u2014 the most fundamental indicator. Weigh approximately 1 g of dried CMC sample, ash at 575\u00b125\u00b0C, dissolve the residue in water, and titrate with 0.1 N sulfuric acid using methyl red indicator. Calculate DS from the volume of acid consumed. Next, measure purity: dissolve 1.5 g CMC in 100 mL of 80% ethanol, stir 10 min, filter through a pre-weighed fritted glass crucible, wash with 80% ethanol, dry at 105\u00b0C, and weigh the residue \u2014 purity = (mass loss \/ initial mass) \u00d7 100%.<\/p><p>For viscosity, prepare a 2% (or per-spec) aqueous solution, condition to 25\u00b10.1\u00b0C, and measure with a Brookfield viscometer at 30 rpm using spindle #3 or #4. Chloride content follows Volhard titration after sample dissolution; water insoluble matter is determined gravimetrically after aqueous dispersion and filtration. A CMC batch that passes all five parameters simultaneously is qualified for mortar and construction use. Any single failure renders the batch unsuitable \u2014 there is no averaging or compensation between tests.<\/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-2c537a58 e-flex e-con-boxed e-con e-parent\" data-id=\"2c537a58\" 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-4798de8b e-con-full e-flex e-con e-child\" data-id=\"4798de8b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-b190f53 e-con-full e-flex e-con e-child\" data-id=\"b190f53\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-394b4b8a e-con-full e-flex e-con e-child\" data-id=\"394b4b8a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4a5d553c elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"4a5d553c\" 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__4a5d553c\" aria-expanded=\"true\" aria-label=\"Abrir Tabela de Conte\u00fados\"><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__4a5d553c\" aria-expanded=\"true\" aria-label=\"Fechar Tabela de Conte\u00fados\"><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__4a5d553c\" 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-7b8d8a9 elementor-widget elementor-widget-text-editor\" data-id=\"7b8d8a9\" 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-11577\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Quality-Testing-and-Specification-Verification.webp\" alt=\"CMC-Quality-Testing-and-Specification-Verification\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Quality-Testing-and-Specification-Verification.webp 800w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Quality-Testing-and-Specification-Verification-300x188.webp 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Quality-Testing-and-Specification-Verification-768x480.webp 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2026\/07\/CMC-Quality-Testing-and-Specification-Verification-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p><h2>Key Takeaways<\/h2><ul><li><strong>Five non-negotiable tests<\/strong> define CMC quality for construction: DS (0.65\u20130.9), purity (\u226599.5%), viscosity (400\u20138,000 mPa\u00b7s), chloride (\u22640.5%), and water insoluble matter (\u22640.3%). Each test guards a distinct performance dimension, and all five must pass independently.<\/li><\/ul><ul><li><strong>Degree of Substitution (DS) is measured by acid-base titration<\/strong> after ashing at 575\u00b125\u00b0C. DS directly controls water solubility, hydration rate, and thickening power \u2014 the three properties that make CMC indispensable in dry-mix mortars, tile adhesives, and wall putty.<\/li><\/ul><ul><li><strong>Brookfield viscometry delivers reproducible viscosity data<\/strong> when sample concentration, temperature (25\u00b10.1\u00b0C), spindle selection, and rotation speed are strictly controlled. Viscosity determines workability, sag resistance, and open time in construction formulations.<\/li><\/ul><ul><li><strong>Purity verification via gravimetric ethanol-insoluble assay<\/strong> ensures the product contains \u226599.5% active CMC. Lower purity means fillers, by-products, or unreacted cellulose are present \u2014 each of which degrades water retention and bonding performance in mortar.<\/li><\/ul><ul><li><strong>Common quality issues include excessive chloride<\/strong> (causes rebar corrosion in reinforced systems), <strong>high water insolubles<\/strong> (indicates poor reaction control during etherification), and <strong>off-spec viscosity<\/strong> (results from cellulose chain degradation or inconsistent DS). All three trace back to manufacturing process failures that incoming QC must catch before production use.<\/li><\/ul><h2>Why This Answer Matters<\/h2><p>Construction chemical failures are expensive, dangerous, and largely preventable. A mortar that sags, a tile adhesive that loses bond after one freeze-thaw cycle, or a wall putty that cracks upon drying \u2014 each of these failure modes can be traced to a single root cause: the CMC thickener did not meet specification.<\/p><p>The CMC market is fragmented and opaque. Counterfeit or adulterated CMC \u2014 diluted with cheap fillers, industrial salt, or recycled cellulose \u2014 circulates widely, especially in price-sensitive construction procurement. Without a disciplined incoming quality verification protocol, even well-formulated construction products will perform unpredictably in the field. The five parameters described here are not academic exercises; they are the minimum viable gate that separates functional CMC from construction-grade waste.<\/p><p>Verifying DS alone catches substitution-level fraud. Purity testing catches filler adulteration. Viscosity measurement catches molecular-weight degradation. Chloride analysis protects reinforced concrete applications from pitting corrosion. Water insoluble matter testing catches unreacted cellulose that produces grit, uneven hydration, and surface defects. Together, these five tests form a complete quality firewall. A lab that implements them will eliminate over 95% of CMC-related field failures before a single bag reaches the jobsite.<\/p><h2>Technical Deep Dive<\/h2><h3>1. Degree of Substitution (DS) \u2014 Acid-Base Titration Method<\/h3><p><strong>Principle:<\/strong> CMC is the sodium salt of carboxymethyl cellulose. When ashed at 575\u00b125\u00b0C, all organic matter is burned off, leaving sodium carbonate (from the sodium carboxymethyl groups) and any inorganic sodium salts. The ash is dissolved in water and titrated with standard sulfuric acid. DS is calculated from the equivalents of NaOH originally present per anhydroglucose unit.<\/p><p><strong>Procedure:<\/strong><\/p><ol><li>Weigh 1.0\u20131.5 g (record to 0.1 mg) of dried CMC sample into a tared porcelain crucible.<\/li><\/ol><ol><li>Ash in a muffle furnace: ramp to 575\u00b125\u00b0C, hold for 2 h, cool in a desiccator.<\/li><\/ol><ol><li>Transfer ash quantitatively to a 250 mL Erlenmeyer flask with 100 mL distilled water.<\/li><\/ol><ol><li>Add exactly 25.0 mL of 0.1 N H\u2082SO\u2084 (standardized) via pipette.<\/li><\/ol><ol><li>Boil gently for 10 min to expel CO\u2082.<\/li><\/ol><ol><li>Cool, add 3 drops methyl red indicator (0.1% in ethanol).<\/li><\/ol><ol><li>Titrate excess acid with 0.1 N NaOH to a yellow endpoint (pH 4.4\u20136.2).<\/li><\/ol><p><strong>Calculation:<\/strong><\/p><pre><code><\/code><\/pre><p>Where 162 = molar mass of anhydroglucose unit, 2300 = 23 (Na) \u00d7 100.<\/p><p><strong>Acceptance:<\/strong> DS = 0.65\u20130.9 for Michem construction-grade CMC. DS below 0.65 gives poor water solubility; DS above 0.9 causes excessive hygroscopicity and reduced thickening efficiency in high-pH cement systems.<\/p><p><strong>Common errors:<\/strong> Incomplete ashing (underestimates DS), CO\u2082 absorption during cooling (overestimates acid consumption), and methyl red endpoint misreading. Always run a blank and a known DS standard in parallel.<\/p><h3>2. Purity \u2014 Gravimetric Ethanol-Insoluble Assay<\/h3><p><strong>Principle:<\/strong> Pure CMC is soluble in 80% (v\/v) ethanol-water, while fillers, salts, and unreacted cellulose are not. Dissolving the sample and filtering yields the insoluble fraction.<\/p><p><strong>Procedure:<\/strong><\/p><ol><li>Weigh 1.5 g dried CMC (W\u2081) into a 250 mL beaker.<\/li><\/ol><ol><li>Add 100 mL of 80% ethanol (pre-warmed to 60\u201365\u00b0C).<\/li><\/ol><ol><li>Stir magnetically for 10 min at 60\u00b0C.<\/li><\/ol><ol><li>Filter through a pre-dried, pre-weighed fritted glass crucible (G3 porosity, W\u2082).<\/li><\/ol><ol><li>Wash residue with three 25 mL portions of warm 80% ethanol.<\/li><\/ol><ol><li>Dry crucible + residue at 105\u00b12\u00b0C to constant weight (W\u2083).<\/li><\/ol><ol><li><strong>Purity (%) = [1 &#8211; (W\u2083 &#8211; W\u2082) \/ W\u2081] \u00d7 100<\/strong><\/li><\/ol><p><strong>Acceptance:<\/strong> \u226599.5% for Michem construction grade.<\/p><h3>3. Viscosity \u2014 Brookfield Rotational Viscometry<\/h3><p><strong>Principle:<\/strong> Rotational viscometry measures the torque required to rotate a spindle at constant speed in a CMC solution. Apparent viscosity is reported in mPa\u00b7s (centipoise equivalent).<\/p><p><strong>Procedure:<\/strong><\/p><ol><li>Prepare a 2% (w\/w dry basis) CMC solution in distilled water. Add CMC powder slowly to the vortex of stirring water at 25\u00b0C. Stir 2 h minimum for full hydration.<\/li><\/ol><ol><li>Condition solution in a 25\u00b10.1\u00b0C water bath for 30 min.<\/li><\/ol><ol><li>Select spindle: #3 for 400\u20132,000 mPa\u00b7s, #4 for 2,000\u20138,000 mPa\u00b7s.<\/li><\/ol><ol><li>Set rotation speed to 30 rpm.<\/li><\/ol><ol><li>Immerse spindle to the mark, start rotation, read after 3 min (or 5 full revolutions after stabilization).<\/li><\/ol><ol><li>Report: Brookfield viscosity, spindle #, rpm, temperature, concentration.<\/li><\/ol><p><strong>Acceptance:<\/strong> 400\u20138,000 mPa\u00b7s at 2%, 25\u00b0C, 30 rpm (per Michem product grade). Lower viscosity grades (400\u20131,200) suit self-leveling compounds; medium grades (1,200\u20134,000) suit tile adhesives and wall putty; high grades (4,000\u20138,000) suit vertical-application mortars requiring maximum sag resistance.<\/p><p><strong>Critical variables:<\/strong> Temperature \u00b10.1\u00b0C changes viscosity by ~2\u20135% per degree; incomplete hydration understates true viscosity; entrapped air bubbles cause erratic readings. Degas solutions under vacuum or let stand overnight before measurement.<\/p><h3>4. Chloride Content \u2014 Volhard Titration<\/h3><p><strong>Principle:<\/strong> Chloride in CMC (from residual NaCl by-product of the Williamson etherification reaction) is extracted into water, precipitated with excess AgNO\u2083, and back-titrated with KSCN using ferric ammonium sulfate indicator.<\/p><p><strong>Procedure:<\/strong><\/p><ol><li>Dissolve 1.0 g CMC in 100 mL distilled water.<\/li><\/ol><ol><li>Add 5 mL dilute HNO\u2083 (1+1) to acidify.<\/li><\/ol><ol><li>Add exactly 20.0 mL 0.1 N AgNO\u2083.<\/li><\/ol><ol><li>Add 2 mL nitrobenzene and shake to coagulate AgCl precipitate.<\/li><\/ol><ol><li>Add 2 mL ferric ammonium sulfate indicator.<\/li><\/ol><ol><li>Titrate with 0.1 N KSCN to a persistent reddish-brown endpoint.<\/li><\/ol><ol><li><strong>Cl% = [(V_AgNO\u2083 \u00d7 N_AgNO\u2083) &#8211; (V_KSCN \u00d7 N_KSCN)] \u00d7 3.545 \/ sample_mass<\/strong><\/li><\/ol><p><strong>Acceptance:<\/strong> \u22640.5% for Michem construction grade. Exceeding this limit risks rebar corrosion in steel-reinforced concrete applications and accelerates setting time drift in Portland cement systems.<\/p><h3>5. Water Insoluble Matter \u2014 Gravimetric Method<\/h3><p><strong>Principle:<\/strong> CMC should dissolve completely in water. Any residue after aqueous dispersion and filtration represents unreacted cellulose, cross-linked gel particles, or insoluble contaminants.<\/p><p><strong>Procedure:<\/strong><\/p><ol><li>Weigh 2.0 g CMC (W\u2081) into a 400 mL beaker.<\/li><\/ol><ol><li>Add 200 mL distilled water at 25\u00b0C with magnetic stirring.<\/li><\/ol><ol><li>Stir for 1 h until fully dispersed.<\/li><\/ol><ol><li>Filter through pre-dried, pre-weighed quantitative filter paper (W\u2082).<\/li><\/ol><ol><li>Wash residue with three 50 mL portions of distilled water.<\/li><\/ol><ol><li>Dry filter + residue at 105\u00b12\u00b0C to constant weight (W\u2083).<\/li><\/ol><ol><li><strong>Water insoluble (%) = (W\u2083 &#8211; W\u2082) \/ W\u2081 \u00d7 100<\/strong><\/li><\/ol><p><strong>Acceptance:<\/strong> \u22640.3% for Michem construction grade.<\/p><p><img decoding=\"async\" class=\"size-large wp-image-2662\" src=\"https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--1024x758.jpg\" alt=\"Time to send this off to the lab. Shot of a young man filling a test tube in a lab.\" width=\"800\" height=\"592\" title=\"\" srcset=\"https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--1024x758.jpg 1024w, https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--300x222.jpg 300w, https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--768x569.jpg 768w, https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--1536x1137.jpg 1536w, https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab--16x12.jpg 16w, https:\/\/michemicals.com\/wp-content\/uploads\/2025\/03\/time-to-send-this-off-to-the-lab-shot-of-a-young-man-filling-a-test-tube-in-a-lab-.jpg 2000w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p><hr \/><h2>Product Specifications \u2014 <a href=\"https:\/\/michemicals.com\/cellulose-ether\/carboxymethyl-cellulose\/\">Michem CMC<\/a><\/h2><table><tbody><tr><td><p>Parameter<\/p><\/td><td><p>Specification<\/p><\/td><td><p>Test Method<\/p><\/td><\/tr><tr><td><p><strong>CAS Number<\/strong><\/p><\/td><td><p>9004-32-4<\/p><\/td><td><p>\u2014<\/p><\/td><\/tr><tr><td><p><strong>Appearance<\/strong><\/p><\/td><td><p>White to off-white free-flowing powder<\/p><\/td><td><p>Visual<\/p><\/td><\/tr><tr><td><p><strong>Degree of Substitution (DS)<\/strong><\/p><\/td><td><p>0.65\u20130.9<\/p><\/td><td><p>Acid-base titration (ashing)<\/p><\/td><\/tr><tr><td><p><strong>Purity (active CMC)<\/strong><\/p><\/td><td><p>\u226599.5%<\/p><\/td><td><p>Gravimetric, 80% ethanol insoluble<\/p><\/td><\/tr><tr><td><p><strong>Viscosity (2% sol., 25\u00b0C)<\/strong><\/p><\/td><td><p>400\u20138,000 mPa\u00b7s<\/p><\/td><td><p>Brookfield, 30 rpm<\/p><\/td><\/tr><tr><td><p><strong>pH (1% aqueous solution)<\/strong><\/p><\/td><td><p>6.5\u20138.5<\/p><\/td><td><p>pH meter<\/p><\/td><\/tr><tr><td><p><strong>Chloride (as Cl)<\/strong><\/p><\/td><td><p>\u22640.5%<\/p><\/td><td><p>Volhard titration<\/p><\/td><\/tr><tr><td><p><strong>Water insoluble matter<\/strong><\/p><\/td><td><p>\u22640.3%<\/p><\/td><td><p>Gravimetric, aqueous dispersion<\/p><\/td><\/tr><tr><td><p><strong>Drying loss<\/strong><\/p><\/td><td><p>\u22648.0%<\/p><\/td><td><p>105\u00b0C oven, constant weight<\/p><\/td><\/tr><tr><td><p><strong>Ionic character<\/strong><\/p><\/td><td><p>Anionic<\/p><\/td><td><p>\u2014<\/p><\/td><\/tr><tr><td><p><strong>Recommended mortar dosage<\/strong><\/p><\/td><td><p>0.1%\u20130.3% (by dry mix weight)<\/p><\/td><td><p>Application-dependent<\/p><\/td><\/tr><\/tbody><\/table><hr \/><h2>Practical Application Guide \u2014 Incoming QC Testing Checklist<\/h2><h3>Pre-Test Preparation<\/h3><ol><li><strong>Sample receipt and logging:<\/strong> Assign batch\/lot number, record supplier, date received, quantity, and packaging condition. Photograph any damaged or opened bags.<\/li><\/ol><ol><li><strong>Sampling:<\/strong> Use a grain thief or sample spear to extract material from at least 3 random bags per lot. Composite sample should be \u2265500 g. Quarter down to ~100 g for testing.<\/li><\/ol><ol><li><strong>Sample drying:<\/strong> Dry composite sample at 105\u00b12\u00b0C for 2 h (or to constant weight) if moisture content will be measured separately. For other tests, use as-received material and correct results for moisture.<\/li><\/ol><h3>Testing Sequence (Efficiency-Optimized)<\/h3><p>Run tests in parallel where equipment allows:<\/p><table><tbody><tr><td><p>Priority<\/p><\/td><td><p>Test<\/p><\/td><td><p>Time Required<\/p><\/td><td><p>Equipment Required<\/p><\/td><\/tr><tr><td><p>1<\/p><\/td><td><p>Drying loss<\/p><\/td><td><p>2\u20133 h<\/p><\/td><td><p>Oven, balance<\/p><\/td><\/tr><tr><td><p>2<\/p><\/td><td><p>DS (ashing)<\/p><\/td><td><p>4\u20135 h (incl. cooling)<\/p><\/td><td><p>Muffle furnace, burette<\/p><\/td><\/tr><tr><td><p>2 (parallel)<\/p><\/td><td><p>Viscosity<\/p><\/td><td><p>3 h (incl. hydration)<\/p><\/td><td><p>Brookfield viscometer, water bath<\/p><\/td><\/tr><tr><td><p>2 (parallel)<\/p><\/td><td><p>Purity<\/p><\/td><td><p>2 h<\/p><\/td><td><p>Hotplate, filtration assembly<\/p><\/td><\/tr><tr><td><p>3<\/p><\/td><td><p>Chloride<\/p><\/td><td><p>1 h<\/p><\/td><td><p>Burette, reagents<\/p><\/td><\/tr><tr><td><p>3 (parallel)<\/p><\/td><td><p>Water insoluble<\/p><\/td><td><p>2 h (excl. drying)<\/p><\/td><td><p>Filtration assembly<\/p><\/td><\/tr><\/tbody><\/table><h3>Acceptance Protocol<\/h3><pre><code><\/code><\/pre><h3>Documentation<\/h3><p>Maintain a CMC QC log with: batch number, supplier, date tested, all six test results (numeric values, not just pass\/fail), analyst initials, and disposition (Accept\/Reject). This log is essential for supplier performance tracking, root cause analysis of formulation failures, and ISO 9001 audit compliance.<\/p><h3>Troubleshooting Common Failures<\/h3><table><tbody><tr><td><p>Failure Mode<\/p><\/td><td><p>Likely Cause<\/p><\/td><td><p>Corrective Action<\/p><\/td><\/tr><tr><td><p>Low DS<\/p><\/td><td><p>Insufficient etherification in manufacturing<\/p><\/td><td><p>Reject batch; audit supplier process<\/p><\/td><\/tr><tr><td><p>Low purity<\/p><\/td><td><p>Filler\/carrier adulteration<\/p><\/td><td><p>Reject batch; switch supplier if recurrent<\/p><\/td><\/tr><tr><td><p>Low viscosity<\/p><\/td><td><p>Chain degradation (overheating, oxidation)<\/p><\/td><td><p>Reject batch; verify supplier storage conditions<\/p><\/td><\/tr><tr><td><p>High viscosity (off-spec high)<\/p><\/td><td><p>Wrong grade shipped<\/p><\/td><td><p>Verify grade with supplier; quarantine<\/p><\/td><\/tr><tr><td><p>High chloride<\/p><\/td><td><p>Incomplete washing during CMC production<\/p><\/td><td><p>Reject batch for reinforced-concrete applications<\/p><\/td><\/tr><tr><td><p>High water insoluble<\/p><\/td><td><p>Unreacted cellulose; poor alkalization<\/p><\/td><td><p>Reject batch; surface-finish applications are most sensitive<\/p><\/td><\/tr><\/tbody><\/table><hr \/><h2>Frequently Asked Questions<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2565c7a elementor-widget elementor-widget-accordion\" data-id=\"2565c7a\" 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-3921\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-3921\" 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 is DS between 0.65 and 0.9 optimal for construction? Can I use CMC with DS outside this range?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3921\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-3921\"><p>CMC with DS &lt; 0.65 exhibits poor water solubility \u2014 it forms lumpy, incompletely hydrated gels that create weak spots in mortar and reduce water retention by 30\u201350%. DS &gt; 0.9 makes CMC excessively hygroscopic, absorbing atmospheric moisture during storage and causing premature hydration in dry-mix formulations. The 0.65\u20130.9 window balances solubility, water retention, and storage stability for cementitious systems. Use outside this range only for non-construction applications (e.g., food-grade CMC at DS 0.4\u20130.7, or paint-grade CMC at DS 0.8\u20131.2).<\/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-3922\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-3922\" 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\">My Brookfield viscosity readings vary by 10\u201315% between measurements on the same solution. What am I doing wrong?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3922\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-3922\"><p>Three common sources of viscosity variability: (1) Temperature drift \u2014 CMC solution viscosity changes ~3% per \u00b0C. Maintain 25\u00b10.1\u00b0C with a circulating water bath, not a static beaker. (2) Incomplete hydration \u2014 CMC particles can take 2+ hours to fully hydrate. Insufficient stirring time or adding powder to static water (rather than into the vortex of stirred water) produces micro-gels and erratic readings. (3) Air entrapment \u2014 visible bubbles reduce effective spindle contact area. Let solutions stand overnight to degas, or vacuum-degas at ~50 torr for 10 min. Always condition the spindle in the solution for 2 min before measurement to eliminate thermal shock and surface tension artifacts.<\/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-3923\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-3923\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How do I distinguish genuine Michem CMC from counterfeit product using these tests?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3923\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-3923\"><p>Counterfeit CMC typically fails purity (fillers drop purity to 85\u201395%) or chloride (industrial-grade NaCl residues push chloride above 2%). A quick two-test screen \u2014 purity by ethanol-insoluble assay plus chloride by Volhard titration \u2014 catches over 90% of fraudulent material. Genuine Michem CMC will consistently deliver purity \u226599.5% and chloride \u22640.5%. Request a certificate of analysis (COA) from Michem for every lot and verify at least purity and DS against the COA values. Discrepancies greater than 2% (absolute) between COA and your lab results warrant quarantine and supplier escalation.<\/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-3924\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-3924\" 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 minimum QC equipment investment to run all five CMC verification tests?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3924\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-3924\"><p>A functional CMC QC lab requires: analytical balance (0.1 mg readability, <del><code data-type=\"inlineMath\">800\u20131,500), muffle furnace (1,100\u00b0C max, ~<\/code>500\u20131,200), Brookfield viscometer with spindles #3 and #4 (<\/del><code data-type=\"inlineMath\">2,000\u20134,000), circulating water bath (\u00b10.1\u00b0C, ~<\/code>500\u20131,000), drying oven (105\u00b0C, <del><code data-type=\"inlineMath\">300\u2013600), fritted glass crucibles and filtration apparatus (~<\/code>200\u2013400), burettes and standard glassware (<\/del><code data-type=\"inlineMath\">300\u2013500), and certified reagents (H\u2082SO\u2084, NaOH, AgNO\u2083, KSCN, ethanol, ~<\/code>200 initial). Total investment: approximately $5,000\u20139,000. This is less than the cost of one failed construction project caused by off-spec CMC.<\/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-3925\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-3925\" 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 skip the DS test if purity and viscosity both pass?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3925\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-3925\"><p>No. Purity and viscosity can both be within specification while DS is out of range \u2014 this is not a redundancy. A CMC with DS 0.55 but high purity (99.7%) and target viscosity may still pass both tests, yet it will fail to hydrate properly in the high-pH, high-ionic-strength environment of wet cement, producing weak mortar. DS is an independent performance predictor that purity and viscosity do not surrogate. Run all five tests on every incoming lot, no exceptions.<\/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-a9f2d3b elementor-widget elementor-widget-text-editor\" data-id=\"a9f2d3b\" 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>CMC quality verification is not a bureaucratic exercise \u2014 it is the single most cost-effective investment a construction chemical manufacturer can make in product reliability. The five-parameter test protocol described here \u2014 DS, purity, viscosity, chloride, and water insoluble matter \u2014 provides a complete quality picture in a single testing cycle. Implement it as an incoming QC gate, document every result, trend your supplier performance, and you will catch quality problems before they become field failures.<\/p><p><a href=\"https:\/\/michemicals.com\/cellulose-ether\/carboxymethyl-cellulose\/\">Michem CMC<\/a> is manufactured under strict process controls to consistently meet or exceed the specifications listed above. Every batch ships with a certificate of analysis, and our technical team is available to assist with method setup, operator training, and troubleshooting in your lab.<\/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-1df69475 elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"1df69475\" 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\/ar\/%d9%8a%d8%ad%d8%a7%d9%81%d8%b8-hec-%d8%b9%d9%84%d9%89-%d8%a7%d8%b3%d8%aa%d9%82%d8%b1%d8%a7%d8%b1-%d8%a7%d9%84%d9%84%d8%b2%d9%88%d8%ac%d8%a9-%d9%81%d9%8a-%d8%af%d8%b1%d8%ac%d8%a7%d8%aa-%d8%a7%d9%84\/\" rel=\"prev\"><span class=\"post-navigation__arrow-wrapper 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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-777980c5 e-flex e-con-boxed e-con e-parent\" data-id=\"777980c5\" 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 To verify CMC (Carboxymethyl Cellulose) quality for construction applications, test five critical parameters: degree of substitution (DS 0.65\u20130.9 via acid-base titration), purity (\u226599.5% by gravimetric analysis), viscosity (400\u20138,000 mPa\u00b7s at specified concentration via Brookfield), chloride content (\u22640.5%), and water insoluble matter (\u22640.3%). 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