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| Item | Index |
|---|---|
| Purity | 99.8min |
| Sulphate | 0.02max |
| Fe | 0.001max |
| Water insoluble substance | 0.05max |
| Loss on drying | 0.1max |
| Heavy metal (Pb) | 0.001 |
| Mesh | 20-100Mesh |
| Appearance | White crystal |
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