... 1,Manufacturer of Sodium Tripolyphosphate (STPP) 2,Free sample 3,High quality and competitive price 4,Quickly delivery Product DescriptionProduct: Sodium Tripolyphosphate ( ... 1. Industrial grade Main content, %; 94.0 P2O5%≥ 57.0 Water insoluble %; 0.1 Iron, as Fe %; 0.015 pH of 1% water solution ... 9.2-10.0 2. Food grade Main content, %: 94.0 P2O5%; 57.0 Water insoluble %; 0.05 Iron, as Fe %; 0.01 pH of ...