- Chemical formula: Na5P3O10 - Molecular weight: 367.88 - Grade: Industrial grade; Food grade - Content (Na5P3O10)............................................ 90%; 90% - P2O5.......................... 57%; 57% - Fe............................. 0.015%; 0.01% - Insoluble..................... 0.1%; 0.1% - Cl............................ 0.5%; 0.5% - PB........................... 0.001%; 0.001% - As........................... 0.0003%; 0.0003% - PH 1%solution................ 9.2-10.0; 9.5-9.9 Packing: - 25/50KGS Plastic woven bag.