| Item | Specification |
| Appearance | White or light brown powder |
| Assay/% | 98.5%min |
| Specific Rotation [α]D 20ºC | -26.0 0 - -29.0 0 |
| Loss on drying | 1.0% max |
| Residue on ignition | 0.5% max |
| Heavy metals (Pb) | 20 ppm max |
| As | 2 ppm max |
| Shelf life | 3 years |