| ≥1 piece | 1 |
| Check item | specifications | Check conclusion |
| Content | 99% min | 99.53% |
| moisture | 3.0% max | 1.37% |
| Water insoluble matter | 0.3% max | 0.1% |
| Readily oxidisable substances | Meets the requirement | Meets the requirement |
| Readily carbonisable substances | Meets the requirement | Meets the requirement |
| Chlorid | 0.02% max | 0.01% |
| Acidity and alkalinity | 0.25ml of 0.1N HCL | 0.1ml of 0.1N HCL |
| Fluoride | 10ppm max | 7ppm |
| Arsenic | 3ppm max | 2ppm |
| Lead | 2ppm max | 1ppm |
| Mercury | 1ppm max | -- |
| Sulfate | 0.1% max | 0.005% |
| Oxide | Meets the requirement | Meets the requirement |