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| Impurities content (weight %) | |
|---|---|
| Residue after calcination | <0.2 |
| Sulfates (SO42-) | <0.015 |
| Chlorides (Cl-) | <0.005 |
| Silicon (SiF62-) | <0.01 |
| Iron (Fe2+) | <0.002 |
| Heavy metals (Pb2+ + Cu2+ + Mn2+) | <0.001 |



