| White crystalline powder | Complying |
| Assay (T) | 99.7-100.3%w/w |
| Ammonium (NH4) | <= 0.0005% |
| Chloride (Cl) | <= 0.003% |
| Calcium (Ca) | <= 0.02% |
| Heavy metals (as Pb) | <= 0.0005% |
| Iron (Fe) | <= 0.001% |
| Phosphate (PO4) | <= 0.001% |
| Potassium (K) | <= 0.005% |
| Magnesium (Mg) | <= 0.005% |
| Sulfate (SO4) | <= 0.003% |
| Insoluble matter | <= 0.015% |