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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 |




