Sodium sulfite anhydrous
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| Name | ITEM | CAS NO. | UN NO./H.S CODE |
| Sodium Sulfite Anhydrous | Sodium Sulfite Anhydrous | 7757-83-7 | 283210 |
| PURITY | Hazard Class | Molecular Formula: | WEIGHT | QUANTITY/20' FCL |
| 90/93/97% | NO | Na 2 SO 3 | 25KG Bag | 26MT |
Chinese Name: Sodium Sulfite Anhydrous
English Name: Sodium sulfite anhydrous
CAS NO: 7577-83-7
Molecular Formula: Na2SO3
Product Specifications
| Item | Specification | ||
| Premium Grade | First Grade | Qualified Grade | |
| Sodium Sulfite (Na2SO3) Content, % | ≥ 97.0 | ≥ 96.0 | ≥ 93.0 |
| Iron (Fe) Content, % | ≤ 0.003 | ≤ 0.005 | ≤ 0.02 |
| Water Insoluble Matter Content, % | ≤ 0.02 | ≤ 0.03 | ≤ 0.05 |
| Free Alkali (as Na2SO3) Content, % | ≤ 0.10 | ≤ 0.40 | ≤ 0.80 |
| Sulfate (as Na2SO4) Content, % | ≤ 2.5 | — | — |
| Chloride (as NaCl) Content, % | ≤ 0.10 | — | |
Packaging: 25 kg plastic woven bags, 50 kg/500 kg/1000 kg flexible intermediate bulk containers (FIBC), or customized according to customer requirements.
Product Description: White crystalline or powder; crystalline form; trigonal prism; its aqueous solution is alkaline with a pH value of about 9–9.5. At 33.4°C, the maximum solubility is about 28%. It oxidizes to sodium sulfate when exposed to air and decomposes to sodium sulfide at high temperatures. Density is 2.633 (15.4°C), refractive index 1.565; molecular weight 126.04.
H.S Code: 283210
Applications: Used in the printing and dyeing industry as a deoxidizer and bleaching agent for various cotton fabrics during scouring to prevent localized oxidation of cotton fibers, which affects fiber strength. In the photographic industry, it is used as a developer. In the organic industry, it serves as a reducing agent in the production of m-phenylenediamine, 2,5-dipyrazolone, aminosalicylic acid, etc. In the textile industry, it is used as a stabilizer and in the production of artificial fibers. Also used in papermaking, electronics, water treatment, and other industries.
| Industry Category | Chemicals/Inorganic Salts/Sulfates |
|---|---|
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| Origin: | China / Shandong / Weifangshi |
