| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | White quadrature crystals | Conforms |
| Water insoluble matter | ≤0.02% | 0.001% |
| Iron (Fe) | ≤0.0025% | 0.0021% |
| Sulfate (SO4) | ≤0.20% | 0.16% |
| Heavy metals(Pb) | ≤0.0005% | 0.0003% |
| Moisture | ≤0.10% | 0.07% |
| Assay( NH2SO3H) | ≥99.5% | 99.65% |
| Conclusion: The Product Conforms to Enterprise Standard. |
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