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| Item | Excellence | First Grade | Qualification |
| Purity | 99.30% Min | 99.0% Min | 98.5% Min |
| Moisture | 0.05%Max | 0.1% Max | 0.1% Max |
| Chlorides(As Bacl2) | 0.05%Max | 0.06% Max | 0.06% Max |
| Iron(Fe) | 0.001%Max | 0.003 % Max | 0.005 % Max |
| Water insoluble content | 0.05%Max | 0.1% Max | 0.15% Max |
| PH value | 5.5-8 | 5.5-8 | 5.5-8 |