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Contact Supplier| Hygroscopicity percent | Grade I | Grade II |
|---|---|---|
| Matter insoluble in water % by weight max. | 0.05 | 0.10 |
| Water insoluble organic matter % by weight max. | 0.02 | 0.02 |
| Matter insoluble in aquaregia % by weight max. | 0.02 | 0.02 |
| Chlorides % by mass max. | 0.02 | 0.50 |
| Perehlerates (as KCLO4) % by weight max. | 0.10 | 0.10 |
| Sulphates (as KSO4) % by weight max. | 0.10 | 0.10 |
| Potassium Nitrate (as KNO3) % by weight max. | 99.50 | 98.50 |