| White to off-white solid | Complying |
| pH (5% in water) | 7.0-9.2 |
| Assay (T dry) | 99.0-101.0%w/w |
| Water insolubles | <= 0.01% |
| Loss on drying (120°C) | <= 1.0% |
| Chloride (Cl) | <= 0.002% |
| Phosphate (PO4) | <= 0.001% |
| Sulfate (SO4) | <= 0.003% |
| Calcium (Ca) | <= 0.005% |
| Magnesium (Mg) | <= 0.002% |
| Heavy metals (as Pb) | <= 0.001% |
| Iron (Fe) | <= 0.001% |