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| Test | Specifications |
| Description | A white, crystalline powder; odourless or almost odourless |
| Solubility | Sparingly soluble in water; practically insoluble in ethanol (96%) |
| Identification | As per test A, B and C of the B.P. |
| pH value of 1% w/v solution | Between 6.0 and 6.5 |
| Heavy Metals | Not more than 20 PPM |
| Water | Between 8.0 and 9.5 % w/w |
| Assay (on anhydrous basis) | Between 98.5 and 100.5 % w/w |