| Items | Standard |
| Assay | ≥99.0% |
| Loss on drying | ≤5% |
| PH | 6.5-9.0 |
| Arsenic | ≤0.0003% |
| Heavy metals Pb | ≤0.001% |
| F Chem fluride | ≤0.003% |
| Insoluble substance in water | ≤0.20% |