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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.0005 |
| Dysprosium (Dy3+) | <0.005 |
| Erbium (Er3+) | <0.005 |
| Yttrium (Y3+) | <0.005 |
| Chlorides (Cl-) | <0.005 |
| Iron (Fe2+) | <0.0005 |
| Calcium (Ca2+) | <0.001 |
| Copper (Cu2+) | <0.0002 |
| Heavy metals (Pb2+) | <0.00005 |




