Complaint
| Item | Specification | Test Results |
| Appearance | White powder | Passed |
| Purity (on dry base ) % | 98.0-102.0 | 99.2 |
| Melting Point ºC | 125-128 | 127.3 |
| Acid | Not more than 0.1 ml of 0.1 N sodium hydroxide is required to produce a blue color | Passed |
| Identification | A. Infrared absorption Spectrophotometry B. Thin-Layer Chromatographic | Passed |
| Residue % | ≤0.1 | 0.05 |
| Loss on drying % | ≤0.5 | 0.3 |
| Heavy Metal ( Pb) | ≤10ppm | Passed |
| Residual solvents (Methanol) | <3000PPM | Passed |
| Related Substances | P-Hydroxybenzoic acid: ≤0.5% Unspecified impurities: ≤0.5% Total impurities: ≤1.0% | Passed |
| Color of solution | 100mg/ml in alcohol,The solution is clear. | Passed |
