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| Impurities content (weight %) | |
|---|---|
| Aluminum (Al) | <0.00002 |
| Calcium (Ca) | <0.0003 |
| Chromium (Cr) | <0.00001 |
| Copper (Cu) | <0.00005 |
| Iron (Fe) | <0.00002 |
| Potassium (K) | <0.00001 |
| Nickel (Ni) | <0.00001 |
| Sulfur (S) | <0.00001 |
| Antimony (Sb) | <0.003 |
| Tin (Sn) | <0.00003 |
| Silicon (Si) | <0.0001 |
| Zinc (Zn) | <0.00001 |



