| TESTING ITEMS | SPECIFICATIONS | RESULTS |
| Appearance | Primrose yellow crystal fine powder | Conforms |
| Melting point | 117.0~121.0℃ | 119.2~120.1℃ |
| Loss on drying | ≤0.50% | 0.20% |
| Residue on ignition | ≤1.0% | 0.13% |
| Iron (Fe) | ≤40ppm | 22ppm |
| Resorcinol content | ≤1.0% | <1.0% |
| The absorbance | ≥80.0% | 90.8% |
| Purity (on dry base) | ≥98.5% | 99.59% |
| Conclusion: The Product Conforms to Enterprise Standard. |
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