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| Item | Standard |
| Appearance | Colorless or white crystals or powder, odorless and tastes sour. |
| Assay (%) | 99.5-100.5 |
| Light Transmittance (%) | ≥ 95.0 |
| Moisture (%) | 7.5-9.0 |
| Readily Carbonisablle Substance | ≤ 1.0 |
| Sulphated Ash (%) | ≤ 0.05 |
| Chloride (%) | ≤ 0.005 |
| Sulphate (%) | ≤ 0.015 |
| Oxalate (%) | ≤ 0.01 |
| Calcium (%) | ≤ 0.02 |
| Iron (mg/kg) | ≤ 5 |
| Arsenic (mg/kg) | ≤ 1 |
| Lead | ≤0.5 |
| Water Insoluble Substances | Filtration time not more than 1 min; Filter membrane basically doesn't change color; Visual mottled particles not more than 3. |
| Packing | 25kg/bag |