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| Impurities content (weight %) | |
|---|---|
| Aluminum (Al3+) | <0.00005 |
| Vanadium (V5+) | <0.00005 |
| Iron (Fe2+) | <0.0005 |
| Potassium (K+) | <0.0001 |
| Cobalt (Co2+) | <0.00005 |
| Manganese (Mn2+) | <0.0005 |
| Copper (Cu2+) | <0.0005 |
| Nickel (Ni2+) | <0.0005 |
| Sodium (Na+) | <0.0002 |
| Tin (Sn2+) | <0.0005 |
| Lead (Pb2+) | <0.0005 |
| Titanium (Ti4+) | <0.00008 |
| Rubidium (Rb+) | <0.001 |
| Chromium (Cr3+) | <0.00002 |



