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| ITEM | STANDARD |
| Appearance | White crystal |
| Solubility in ethanol | colourless and clear |
| Purity | >= 99.2 % |
| Melting point ℃ | 89-93 ℃ |
| Moisture | =< 0.5 % |
| Residue on ignition % | =< 0.2 % |
| Heavy metals (as Pb) | =< 10 PPM |
| Arsenic | =< 1 PPM |
| Fe | =< 1 PPM |