Industrial Grade: Purity: 94.0% min Phosphorus Pentoxide(as P2O5): 57.0% min Water Insoluble: 0.1% max PH Value: 9.2-10 Iron (as Fe): 150ppm max Bulk Density: Light (0.5-0.7 g/cc), Medium (0.7-0.9 g/cc) and Dense (0.9-1.1g/cc) Food Grade: Purity: 94.0% min Phosphorus Pentoxide(as P2O5): 57.0% min Water Insoluble: 0.05% max PH Value: 9.2-10 Iron (as Fe): 100ppm max Arsenic (as As) : 3ppm max Heavy Metals (as Pb) : 10ppm max Bulk Density: Light (0.5-0.7 g/cc), Medium (0.7-0.9 g/cc) and Dense (0.9-1.1g/cc)