| ≥1 piece |
| Item | Standard | ||||
| Appearance | White Crystallized Powder | ||||
| Content | 99.0-100.5% | ||||
| Loss on Drying | ≤ 0.5% after drying for three hours over sulphuric acid | ||||
| PH | About 4 (solution in water) | ||||
| Melting Range | 121.5-123.5 | ||||
| Heavy Metal(as Pb) | ≤ 10ppm | ||||
| Arsenic(as As) | ≤ 3ppm | ||||
| Lead(Pb) | ≤ 5ppm | ||||
| Mercury(as Hg) | ≤ 1ppm | ||||
| Aldehydes(as HCHO) | ≤ 0.1% | ||||
| 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 |