| ITEMS | STANDARD | RESULTS |
| Appearance | A white or almost white crystalline powder | Conforms |
| Identification | Comply with | Comply with |
| Melting Point | 164.5~166.5 | 164.5~165.0 |
| Assay | ≥99.0% | 99.50% |
| Loss on drying | ≤0.5% | 0.32% |
| Chloride | ≤0.035% | <350PPM |
| Heavy metals | ≤10PPM | <10PPM |
| Iron | ≤40PPM | <40PPM |
| Residue on ignition | ≤0.1% | 0.05% |
| Alkali-insoluble | Clear | Clear |
