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| Name of index | Premium Grade | First Grade | qualified product |
| magnesium oxide content %≥ | 95.00 | 93.00 | 92.00 |
| calcium oxide content %≤ | 1.00 | 1.50 | 2.00 |
| Hydrochloric acid insoluble substance %≤ | 0.10 | 0.15 | 0.20 |
| Ferrum content %≤ | 0.05 | 0.06 | 0.20 |
| Loss on ignition %≤ | 3.50 | 5.50 | 5.50 |
| Screenings(150um)≤ | 0.030 | 0.050 | 0.10 |
Magnesium Oxide
