| Assay: | ≥ 99.0% NH4B |
| pH of a 5% solution: | 4.5Ð6.0 at 25°C |
| MAXIMUM ALLOWABLE | |
| Insoluble matter: | 0.005% |
| Residue after ignition: | 0.01% |
| Bromate (BrO3): | 0.002% |
| Chloride (Cl): | 0.2% |
| Iodide (I): | Passes test |
| Sulfate (SO4): | 0.005% |
| Barium (Ba): | 0.002% |
| Heavy metals (as Pb): | 5 ppm |
| Iron (Fe): | 5 ppm |