... of Sodium Tripolyphosphate (STPP) 2,Free sample 3,High quality and competitive price 4,Quickly delivery Product DescriptionProduct: Sodium Tripolyphosphate (STPP) ... Industrial grade Main content, %; 94.0 P2O5%≥ 57.0 Water insoluble %; 0.1 Iron, as Fe %; 0.015 pH of 1% water solution ... , as Pb %; 0.001 Arsenic, as As, %; 0.0003 Fluoride, as F, %; 0.003 Chloride, as Cl %; 0.025 4, Packing: Plastic-woven ...