Supply Sodium Pyrophosphate food & tech grade at good prices Sodium pyrophosphate Na4P2O7 % 96.5-100.5 Water-insoluble constituents % Max. 0.20 pH (1% aqueous solution) 9.9 -10.7 Arsenic (As) mg/kg Approx. 2 Heavy Metal (as Pb) mg/kg Approx. 6 Fluoride (as F) mg/kg Approx. 15 Loss on Ignition % Max. 0.50 Orthophosphate Passed test Chromium (Cr) mg/kgMax 1 Nickel (Ni)mg/kg Max 1 Cadmium (Cd) mg/kgMax 1 Lead (Pb) mg/kg Max 1