| Color | White |
| Form | Powder |
| Assay (dry basis) | 99.0%-100.5% |
| pH Value | 7.0-9.0 (10% solution ) |
| Acidity | ≤ 0.1% |
| Alkalinity | ≤ 0.1% |
| Loss on Drying | ≤ 4.0% |
| Water-Insoluble Substance | ≤ 0.15% |
| Heavy Metals | ≤ 10 ppm (as Pb) |
| Arsenic (As) | ≤ 3 ppm |
| Lead (Pb) | ≤ 2 ppm |
| Mercury (Hg) | ≤ 1 ppm |
| Iron (Fe) | ≤ 5 ppm |
| Magnesium (Mg) | ≤ 0.4% |
| Orgaic Volatile Impurities | Meet the requirements |
| Fluorine/ Fluoride | ≤ 3.0 ppm |
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