Product Name: Tetrasodium Pyrophosphate (TSPP) "Type: Food Additives Origin: China CAS No.: 7722-88-5 AUCO No.: 301 Packing: 25kg bag" Items Standard Content (Na4P2O7) % 96.5 PH value (1% water solution) 9.9~10.7 Water-insoluble % 0.2 Fluoride (F) mg/kg 50.0 Arsenic (As) mg/kg 3.0 Loss on burning % 0.5 Pb mg/kg 4.0 Heavy Metal mg/kg 10.0