| Item | Specifications |
| Characteristics | A white crystalline powder |
| Solubility | Sparingly soluble in water,freely soluble in alcohol, very slightly soluble in ether and in methylene chloride |
| Identification | Conforms |
| Melting range | 168-172℃ |
| Chloride | Not more than 0.014% |
| Sulphate | Not more than 0.02% |
| Sulfide | No coloration or spotting occurs |
| Readily carbonizalbe substances | Conforms |
| Free P-aminophenol | Not more than 0.005% |
| Related substance | Conforms |
| p-Chlorine Acetanilide | Not more than 0.001% |
| Loss on drying | Not more than 0.5% |
| Residue on ignition | Not more than 0.1% |
| OVI | Meets the requirements |
| Assay | 99.0-101.0% |
| Heavy metals | Not more than 0.001% |
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