| ITEM | STANDARD |
| Property | White crystal or crystalline powder |
| Identification | Positive |
| PH value | 5.5-5.6 |
| Chloride, %=< | 0.01 |
| Sulfate, %=< | 0.02 |
| P-aminophenol, %=< | 0.005 |
| Loss on drying, %=< | 0.5 |
| Residue on ignition, %=< | 0.1 |
| Heavy Metal, ppm=< | 10 |
| Substances concerned | Up to regulation |
| Content (dry goods),% | 98-102.0 |