| Assay: | ≥99.0% CuO |
| MAXIMUM ALLOWABLE | |
| Insoluble in dilute hydrochloric acid: | 0.02% |
| Carbon compounds (as C): | 0.01% |
| Chloride (Cl): | 0.005% |
| Nitrogen compounds (as N): | 0.002% |
| Sulfate (SO4): | 0.02% |
| Free alkali: | Passes test |
| Calcium (Ca): | 0.01% |
| Iron (Fe): | 0.05% |
| Potassium (K): | 0.02% |
| Sodium (Na): | 0.05% |