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| Impurities content (weight %) | |
|---|---|
| Boron (BO33+) | <0.003 |
| Barium (Ba2+) | <0.0005 |
| Calcium (Ca2+) | <0.0005 |
| Cadmium (Cd2+) | <0.00001 |
| Magnesium (Mg2+) | <0.0001 |
| Iron (Fe2+) | <0.0001 |
| Strontium (Sr2+) | <0.0001 |



