| Items | Specifications |
| Content | 99-100.5% |
| Loss on drying | ≤0.5% after drying for three hours over sulphuric acid |
| Melting range | 121.5-123.5°C |
| PH | About 4 (solution in water) |
| Arsenic | ≤3 ppm |
| Lead | ≤5 ppm |
| Mercury | ≤1 ppm |
| Heavy metal (as pb) | ≤10 ppm |
| Sulphated ash | ≤0.05% |
| Positive sublimation test and test for benzoate | Qualified with regulations |
| Readily oxidizable substances | Qualified with regulations |
| Polycyclic acid | Pass test |
| Chlorinated organic compounds | ≤300 ppm |
| Appearance of solution | Clarification, colorless |
