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Impurities content (weight %) | |
---|---|
Insoluble in water substances | <0.001 |
Dysprosium + Holmium + Thulium + Ytterbium + Yttrium | <0.03 |
Iron (Fe2+) | <0.005 |
Calcium (Ca2+) | <0.005 |
Copper (Cu2+) | <0.002 |
Heavy metals (Pb2+) | <0.0002 |