... Appearance: White powder or granular; STPP sodium tripolyphosphateSpecifications1,Manufacturer of Sodium Tripolyphosphate (STPP) 2,Free sample 3 ... synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, dye auxiliary agent, and dispersant of suspension ... magnesium oxide, calcium carbonate drilling mud, preservative agent for paper making, organic synthesis catalyzer, and used ...