| Appearance | White or almost white powder |
| Assay by chemical | 100.0 (ODB) |
| Melting point | 150°C to 153°C |
| Sulfated ash | Max. 0.1 % |
| Loss on drying | Max. 0.5 % |
| Solubility | Practically insoluble in water, slightly soluble in ethanol (96 per cent) in methanol and in methylene chloride. |




