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Impurities content (weight %) | |
---|---|
Substances insoluble in Na2CO3 solution | <0.2 |
Residue after calcination | <0.1 |
Chlorides (Cl-) | <0.1 |
Iron (Fe2+) | <0.0001 |
Heavy metals (Pb2+) | <0.0005 |
Melting point (in the range of 1°C) | 145-148°C |