| Assay: | ≥99.0% HOOC(CHOH)2COOH |
| MAXIMUM ALLOWABLE | |
| Insoluble matter: | 0.005% |
| Residue after ignition: | 0.02% |
| Chloride (Cl): | 0.001% |
| Oxalate (C2O4): | Passes test |
| Phosphate (PO4)): | 0.001% |
| Sulfur compounds (as SO4): | 0.002% |
| Heavy metals (as Pb): | 5 ppm |
| Iron (Fe): | 5 ppm |