| Assay: | 99.0-103.0% ZnSO4 · 7H2O |
| pH of a 5% solution: | 4.4-6.0 at 25 °C |
| MAXIMUM ALLOWABLE | |
| Insoluble matter: | 0.01% |
| Chloride (Cl): | 5 ppm |
| Nitrate (NO3): | 0.002% |
| Ammonium (NH4): | 0.001% |
| Calcium (Ca): | 0.005% |
| Iron (Fe): | 0.001% |
| Lead (Pb): | 0.003% |
| Magnesium (Mg): | 0.005% |
| Manganese (Mn): | 3 ppm |
| Potassium (K): | 0.01% |
| Sodium (Na): | 0.05% |