| ITEMS | Technical Index |
| Appearance | White needle crystal |
| Melting point | 150-158ºC |
| Content | ≥99% |
| PH | 7.2-9.7 |
| Free hydrazine | ≤ 250 |
| Sulfate | ≤20PPM |
| Clarification | Clear |
| Loss on drying | ≤0.2% |
| Chloride | ≤10ppm |
| Silica | ≤10ppm |
| Copper | ≤1ppm |
| Na | ≤4ppm |