| White to almost white solid | Complying |
| Assay | 98.5-101.5% |
| Identity (IR) | Complying |
| Melting point | 132-135°C |
| Alkalinity | Complying |
| Biuret | <= 0.1% |
| Ammonium (NH4) | <= 0.05% |
| Heavy metals (as Pb) | <= 0.001% |
| Sulphated ash | <= 0.1% |
| Loss on drying (105°C) | <= 1.0% |
| Appearance of solution | Complying |