STPP 94%Min; P2O5:57%Min; Phase I: 15-40% Heavy and Light STPP Approved by Unilever, Ceramics 10 years producing experie STPP Sodium TripolyphosphateNa5P3O10,% ... -10.0Iron (Fe), %, Max.0.015Fluoride (F), %, Max.0.003Chloride (Cl), %, Max.0.025Sulphate (as SO4), %, Max.0.4Bulk density, g/l650-990White ... widely used in gum synthesis, foodstuff industry, and poultry process. sodium tripolyphosphate STPP