... (STPP) 2,Free sample 3,High quality and competitive price 4,Quickly delivery Product DescriptionProduct: Sodium Tripolyphosphate ( ... powder with luster, melting point at 622 o C, easily soluble in water, with remarkable chelating ... -10.0 2. Food grade Main content, %: 94.0 P2O5%; 57.0 Water insoluble %; 0.05 ... 0.001 Arsenic, as As, %; 0.0003 Fluoride, as F, %; 0.003 Chloride, as Cl %; 0.025 4 ...