| White to off-white solid | Complying |
| Assay (T) | 98.0-102.0%w/w |
| pH (5% in water) | 8.5-9.6 |
| Loss on drying (105°C) | <= 1% |
| Chloride (Cl) | <= 0.003% |
| Heavy metals (as Pb) | <= 0.0005% |
| Iron (Fe) | <= 0.001% |
| Sodium (Na) | <= 0.05% |
| Sulfate (SO4) | <= 0.005% |
| Water insolubles | <= 0.01% |
| Nitrogen compounds (as N) | <= 0.001% |