Consultation telephone: 18678882488 Consultation telephone: 18678882488 
1. Pharmaceutical industry, papermaking, tanning, leather printing and dyeing industry, plant fiber bleaching, food, etc.
2. It is used as deoxidizer in film development, bleaching agent and printing and dyeing industry.
3. Industrial grade products can be used as chemical raw materials, for the production of sodium sulfite, sodium chlorite, etc.
4. For the production of chemical reagents.
5. This product can be used as food additive.
6. Used in printing and dyeing industry as deoxidizer and bleaching agent.
| Inspection items | Standard requirements |
| Sodium sulfite (as Na2SO3)，% | ≥96.0 |
| Iron（Fe）/（mg/kg），% | ≤0.02 |
| Free alkali (as Na2CO3)% | ≤0.8 |
| Water insoluble substance% | ≤0.05 |
| Sulfate (as Na2SO4)，% | ≤2.5 |
| Chloride (as NaCl)，% | ∕ |
| Appearance | White crystalline powder |
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