Commodity: Sodium Hexametaphosphate 68% Tech. Grade Specification: Phosphorus pentoxide (P2O5) 68% min Inactive phosphate (P2O5) 7.5% max Water insoluble 0.05% max Iron (Fe) 0.05% max PH(10g/L solution) 5.8-7.0 Appearance white powder or crystal Commodity: Sodium Hexametaphosphate 68% Food Grade Specification: Phosphorus pentoxide (P2O5) 68% min Inactive phosphate (P2O5) 7.5% max Water insoluble 0.06% max Iron (Fe) 0.05% max PH(10g/L solution) 5.8-6.5 Arsenic(As) 0.0003% max Heavy Metal(Pb) 0.001% max Fluoride(F) 0.003% max