... 2.also widely used in gum synthesis STPP Chemical name:Sodium tripolyphosphate Chemical formula: Na5P3O10 Molecular weight: 367.861. ... water softener, leather pre-tanning agent, dye auxiliary agent, and dispersant of suspension such as paint, kaolin, magnesium oxide, ... , preservative agent for paper making, organic synthesis catalyzer, and used in epuration of petroleum product, gum latex storage, ...