No | Specifications | Technical Grade | Food Grade |
1 | Main content | 98.0% min. | 98.0% min. |
2 | P2O5 | 18.3% min. | 18.3% min. |
3 | Sodium oxide, as Na2O | 15.5-19.0% | 15.5-19.0% |
4 | Sulfate, as SO4 | 0.5% max. | 0.5% max. |
5 | Heavy metal, as Pb | - | 0.001% max. |
6 | Arsenic, as As | - | 0.0003% max. |
7 | Fluoride, as F | - | 0.002% max. |
8 | Water insoluble | 0.10% max. | 0.05% max. |