Methylcellulose, viscosity number

Methylcellulose, carboxymethyl cellulose, polyvinyl alcohol, sodium polyacrylic, and polyacrylamide copolymer are also used for thickening agents. The qualities of methylcellulose and carboxymethyl cellulose are checked measuring the viscosity of water solution of 2-5%. For polyvinyl alcohol, viscosity (4% at 20°C), saponification number, and polymerization degree are indexes of the quahty. 

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