CMC (Carboxy Methyl Cellulose)
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Carboxymethyl cellulose (CMC) is a water-soluble anionic linear polymer. In food, pharmaceutical and cosmetic applications, highly purified types (99.5%+) are required and are referred to as cellulose gum.
Technical grades (90-99.5%) are used in adhesives, coatings, pulp and paper, textiles and other industrial applications. Industrial (50-90%) grades of CMC, which contain large amounts of sodium chloride and sodium glycolate, are used in a number of detergent, mining and petroleum outlets.
Commercial products come in some 500 different grades differing on impurity level, molecular weight, Food and Drug Agency regulation, degree of substitution (DS) and several other factors. The DS level can range from 0.4 to 1.4 but most products have a DS of 0.7. Viscosity ranges from 6000 centiPoise (cP) in 1% solution to 10 cP in 2% solution.
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