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| Impurities content (weight %) | |
|---|---|
| Free acidity (HF) | <0.03 |
| Sulfates (SO42-) | <0.005 |
| Chlorides (Cl-) | <0.002 |
| Iron (Fe2+) | <0.005 |
| Calcium (Ca2+) | <0.025 |
| Heavy metals (Pb2+) | <0.001 |
| Losses during drying | <0.05 |




