| Color | White |
| Form | Crystalline powder |
| Identification | Positive |
| Assay (dry basis) | 98.5%-101.5% |
| pH Value | 5.5-6.5 |
| Transmissivity | ≥ 98.0% |
| Loss on Drying | ≤ 0.2% |
| Sulfate (as SO4) | ≤ 0.0065% |
| Ignition Residue | ≤ 0.1% |
| Heavy Metals | ≤ 20 ppm (as Pb) |
| Arsenic (As) | ≤ 1 ppm |
| Lead (Pb) | ≤ 1 ppm |
| Iron (Fe) | ≤ 10% |
| Chloride | ≤ 0.007% |
| Ammonium (NH4) | ≤ 0.01% |
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