... quality and competitive price 4,Quickly delivery Product DescriptionProduct: Sodium Tripolyphosphate (STPP)CAS No.: 7758-29-4 Molecular Formula: ... , Usage: Used as main auxiliary of synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, dye ... , calcium carbonate drilling mud, preservative agent for paper making, organic synthesis catalyzer, and used in epuration of petroleum ...