Sodium Sulfite CAS No.7757-83-7 (Na₂SO₃) is a white crystalline powder with strong reducing properties. It dissolves easily in water and is lightly soluble in alcohol. It acts as a reducing agent, dechlorination agent, and oxygen scavenger in various chemical processes. When exposed to air, it can oxidize to sodium sulfate and decomposes under heat or acidic conditions, releasing CO₂.
It helps prevent oxidation, removes chlorine, and stabilizes chemical reactions, making it an essential raw material in multiple industrial processes.
| Name | Sodium Sulfite CAS No.7757-83-7 |
| Other Names | Sodium Sulfite |
| Specification | 92%, 96%, 97% Min. |
| CAS No. | 7757-83-7 |
| Molecular Formula | Na2SO3 |
| Molecular Weight | 126.04 |
| Property |
Our Sodium Sulfite is a white crystalline powder with a specific gravity of 2.633 and melts at around 150℃. It dissolves easily in water and a little in alcohol. When dissolved in water, the solution is slightly alkaline. It works as a reducing agent, which means it can prevent oxidation in many processes. When exposed to air, it slowly changes into sodium sulfate. If it is heated or comes into contact with inorganic acids, it will decompose and release CO₂ gas. It perfect for applications like water treatment, bleaching, leather processing, and chemical reactions where controlling oxidation or removing chlorine is important. |
| ITEMS | GRADE | HIGH GRADE |
| Na2SO3(DRY BASIS) | 96.0%min | 97%min |
| IRON(Fe) | 0.01%max | 0.003%max |
| WATER INSOLUBLE SUBSTANCE | 0.03%max | 0.02%max |
| FREE ALKALI(As Na2CO3) | 0.60%max | 0.1%max |
| SULFATE (As SO4 ) | - | 1.0%max |
| CHLORIDE(As NaCl ) | - | 0.1%max |
| HEAVY METAL(As Pb) | 10 .0mg/kg max | 10 .0mg/kg max |
| As As | 2.0mg/kg max | 2.0mg/kg max |
1. In the food industry, our Sodium Sulfite is commonly used as a bleaching agent, preservative, loosening agent, and antioxidant. It helps keep food fresh, maintain color, and extend shelf life.
2. It also plays an important role in pharmaceutical synthesis and is widely used as a reducing agent in the production of dehydrated vegetables, ensuring product stability and quality.
3. In the textile industry, Low Price Sodium Sulfite CAS No.7757-83-7 is used as a dye-reducing agent during the processing of cotton fabrics. This helps improve fabric whiteness and consistency, giving your finished products a better appearance.
4. In the paper industry, it is used as a lignin remover to improve pulp quality. In the textile industry, it works as a stabilizer for man-made fibers, ensuring better fiber performance.
5. In the electronics industry, it is applied in the manufacture of photo-resistors, supporting precise and reliable production.
6. In water treatment, it is used for electroplating wastewater treatment, drinking water purification, and other applications.
7. It is also used as a developer in the photosensitive industry.
8. In the organic chemical industry, Sodium Sulfite CAS No.7757-83-7 is used as a reducing agent to prevent oxidation of semi-finished products during reactions, ensuring product stability and consistent quality.
9. It is also used in the production of cellulose sulfite and sodium thiosulfate.
Q1: Are you a manufacturer or a trader?
We are a professional Sodium Sulfite manufacturer and supplier in China, producing directly in our factory.
Q2: Can you provide samples?
Yes, samples are available for testing before bulk orders.
Q3: What is your minimum order quantity (MOQ)?
MOQ is flexible. Bulk buyers can get even more favorable pricing.
Q4: How do you ensure product quality?
Every batch undergoes in-house testing. Third-party reports from SGS, Intertek, BV are available on request.
Q5: Do you provide custom packaging or grades?
Yes. We can supply different purity grades, packaging options, and technical advice tailored to your application.
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