1, Purity(as P2O5) 68% 2, Water Insoluble 0.05% 3, Average dissolution in clean water: 0.15--- 0.4 g/24 hours SPECIFICATION: Food Grade All percentages are by weight unless otherwise specified. (10 ppm = 0.001%) Item Value Unit Index Purity(as P2O5) 68.0 % Min Inactive Phosphate 7.0 % Max Water Insoluble 0.05 % Max Fluoride 50 ppm Max Heavy Metal(as Pb) 10 ppm Max Arsenic(As) 3 ppm Max PH value 2 ...