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https://www.sunflowerpolymer.com/products/crospovidone-pvpp-cas-no-9003-39-8/

CROSPOVIDONE is a cross-linked polyvinylpyrrolidone, which is mostly used as a clarifier and stabilizer for beer, fruit wine, and fruit juice in the brewing and beverage industries. It improves the stability of beer while maintaining the characteristics and flavor of beer, such as the basic qualities of the beer, flavor, and foam stability.

Crospovidone cas number: 9003 39 8