| Color | White |
| Form | Crystalline powder |
| Identification | Meet the requirement |
| Assay (dry basis) | 99.0%-100.5% |
| pH Value | 7.5-9.0 (5% solution) |
| Acidity | Pass Test |
| Alkalinity | Pass test |
| Appearance of Solution | Pass test |
| Loss on Drying | 11.0%-13.0% |
| Sulphate | ≤ 150 ppm |
| Heavy Metals | ≤ 5 ppm |
| Arsenic (As) | ≤ 1 ppm |
| Lead (Pb) | ≤ 1 ppm |
| Mercury (Hg) | ≤ 1 ppm |
| Chloride | ≤ 50 ppm |
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