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| Impurities content (weight %) | |
|---|---|
| Antimony(III) oxide (Sb2O3) | <2.0 |
| Iron (Fe2+) | <0.003 |
| Potassium + Sodium + Calcium (K+ + Na+ + Ca2+) | <0.015 |
| Arsenic (As3+) | <0.003 |
| Lead (Pb2+) | <0.001 |




