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Copper oxide quality indicators
| Chemical composition of copper oxide powder | % | % |
| Name | CuO 98% | CuO 99% |
| Copper oxide（CuO） | ≥98 | ≥99 |
| chloride（Cl） | ≤0.015 | ≤0.005 |
| Insoluble substances in hydrochloric acid（Insoluble in Hcl） | ≤0.15 | ≤0.05 |
| sulfate（SO42-） | ≤0.1 | ≤0.01 |
| iron（Fe） | ≤0.1 | ≤0.01 |
| Total nitrogen content（N) | _ | ≤0.005 |
| Water-soluble substance（soluble in water） | ≤0.1 | ≤0.01 |
| 74um sieve residue | ≤1 | ≤1 |