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| Impurities content (weight %) | |
|---|---|
| Insoluble in HCl substances | <0.1 |
| Residue after calcination | <0.05 |
| Nitrates (NO3-) | <0.03 |
| Sulfates (SO42-) | <0.006 |
| Chlorides (Cl-) | <0.003 |
| Iron (Fe2+) | <0.002 |
| Average particle size | 10-20 µ |




