| Appearance (Colour) | White or almost white , colourless |
| Appearance (Form) | Crystalline powder or crystals |
| Solubility | Freely soluble in water,slightly soluble in alcohol |
| Identification (IR Spectrum) | A) Passes |
| Assay (HPLC) | 98.5 -101.5% (On anhydrous bassis) |
| Residue on ignition | NMT 0.1% |
| Water (KF) | NMT 0.5% |
| Reference | USP 44 |
