| Assay: | 99.5-102.5% H2C2O4 · 2H2O |
| Substances darkened by hot sulfuric acid: | Passes test |
| MAXIMUM ALLOWABLE | |
| Insoluble matter: | 0.005% |
| Residue after ignition: | 0.01% |
| Chloride (Cl): | 0.002% |
| Sulfate (SO4): | 0.005% |
| Calcium (Ca): | 0.001% |
| Nitrogen compounds (as N): | 0.001% |
| Heavy metals (as Pb): | 5 ppm |
| Iron (Fe): | 2 ppm |