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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 |