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Contact Supplier| Appearance | Colorless Crystals. |
| Assay (on anhydrous basis) | Min 99% |
| Chloride (Cl) | Max 0.001% |
| Sulphate (SO4) | Max 0.01% |
| Iron (Fe) | Max 0.001% |
| Lead (Pb) | Max 0.002% |
| Substance not precipitated by HCl (as SO4) | Max 0.3% |