Name: Sodium Metabisulfite CAS No.7681-57-4
Other Names: Sodium Pyrosulfite;Disodium Metabisulfite; Disodium Pyrosulphite; Fertisilo; Metabisulfite Desodium
Property: White or light-yellow crystalline powder with a faint SO₂ odor. Specific gravity is 1.4. Slightly soluble in alcohol. It is sensitive to moisture and decomposes easily, and when exposed to air, it gradually oxidizes to sodium sulfate.
| Product | sodium metabisulfite |
| CAS no. | 7681-57-4 |
| purity | 90% 92% 94% 96% 97% 98% |
| Color | white |
| Application | powder |
| Packaging | 25kg/ 1000kg bag |
| Sample | free |
| Classification | non hazardous chemicals |
| Molecular formula | Na₂S₂O₅ |
| Use | organic synthesis, printing, tanning, printing and dyeing |
| EINECS | 231-673-0 |
| Molecular Weight: | 190.10 |
| Food Preservative | |||
| Antimicrobial |
It is widely used as a food preservative for dried foods and fruit concentrate juices. It works as an antimicrobial agent, inhibiting the growth of bacteria and fungi to help keep food fresh, safe, and longer-lasting. |
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| In beer and wine production, it is used as both a sterilizer and an antioxidant, helping to prevent spoilage and maintain quality during brewing or fermentation. | |||
| Component | Industrial Grade | Food Grade | High Purity Grade |
| Appearance | White or yellowish crystalline powder | ||
| Assay(Na2S2O5 ) | 96.5%min | 97%min | 98%min |
| water insoluble matter | 0.05%max | 0.03%max | 0.02%max |
| Iron content(Fe) | 0.005%max | 0.003%max | 0.002%max |
| Arsenic content(As) | 0.0001%max | 0.0001%max | 0.0001%max |
| Pb | 0.0005%max | 0.0005%max | 0.0003%max |
The Cheap Sodium Metabisulfite CAS No.7681-57-4 is primarily used as a reducing agent in various chemical reactions to prevent oxidation and stabilize the reaction process. It is also ideal for bleaching plant fibers and textiles, effectively improving the whiteness and consistency of the finished product. Furthermore, this product is used in the preparation of photographic and film developing solutions and in the treatment of tanning agents during textile dyeing, helping to improve dyeing results and overall quality.
1. It can be used as a bleaching agent, commonly found in the processing of candies, cakes, and other foods, helping to improve appearance and color.
2. It can also be used as a leavening agent, for example, in baked goods such as bread and cookies, making the finished product softer and with a better texture.
3. Furthermore, it is widely used as a preservative in foods such as juices, canned goods, brewed beer, and grains, helping to extend shelf life and maintain quality stability.
4. Simultaneously, it can also be used as an antioxidant preservative in foods such as bamboo shoots, seafood, fruits, and vegetables, slowing down the oxidation process and maintaining freshness and flavor.
5. During leather processing,The Quality Sodium Metabisulfite CAS No.7681-57-4 can make leather softer and more resilient, while improving its water resistance, flexural strength, and abrasion resistance, thereby significantly improving the overall quality and lifespan of the leather.
6. Used as an ore-dressing agent formines.
7. Widely used in the water treatment industry, it effectively removes excess oxygen from wastewater and pipeline systems. Its antibacterial properties also contribute to the cleaning and maintenance of pipelines in seawater desalination plants, helping to maintain stable system operation.
8. This product can be used in the pharmaceutical industry as an antioxidant additive and reducing agent in injectable drugs.
9. It can be used in the printing and dyeing industry as a bleaching agent.
Food Industry – Preservation and Quality Control
Sodium Metabisulfite is widely used in the food industry due to its preservative, antioxidant, and antimicrobial properties.
1.Used in dried foods and fruit concentrate juices to inhibit bacteria and fungi
2.Helpsextend shelf life while maintaining food safety
3.In beer and wine production, it acts as a sterilizer and antioxidant, preventing spoilage during fermentation and storage
4.Improves appearance and color in foods such as candies and cakes
5.Works as a leavening aid in baked goods like bread and cookies, improving softness and texture
Textile, Printing and Dyeing Industry
In textile processing, The Cheap Sodium Metabisulfite CAS No.7681-57-4 is commonly used as a reducing and bleaching agent.
1.Improves fabric whiteness and color consistency
2.Used in printing and dyeing to stabilize dyes and enhance final appearance
3.Helps treat tanning agents during textile dyeing for better results
During leather processing, this product helps make leather softer, more flexible, and more durable.
1.Enhances water resistance
2.Improves flexural strength and abrasion resistance
3.Significantly extends the service life of finished leather products
Sodium Metabisulfite is widely applied in industrial and municipal water treatment.
1.Effectively removes excess dissolved oxygen from wastewater and pipelines
2.Helps prevent corrosion and oxidation in water systems
3.Its antimicrobial properties support pipeline cleaning and maintenance in seawater desalination plants, ensuring stable operation
Used as a reducing agent in organic synthesis to prevent oxidation during reactions
1.Applied as an ore-dressing agent in mining processes
2.Used in pharmaceutical manufacturing as an antioxidant additive and reducing agent for injectable drugs
3. Suitable for photographic and film-developing solutions
1. We are a large-scale manufacturer and supplier of sodium metabisulfite in China.
2. We can provide multiple grades suitable for food, industrial, and high-purity applications.
3. Strict quality control and consistent batch-to-batch quality.
4. Our products are highly competitively priced and we have a long-term, stable supply capability.
5. We have extensive export experience, serving customers worldwide.
We not only sell chemicals, but also prioritize reliability, stability, and long-term partnerships. You can choose us with confidence.
Q1: What are the main uses of Sodium Metabisulfite CAS No.7681-57-4?
Sodium Metabisulfite is widely used in various industries, including food preservation, beer and wine brewing, textile printing and dyeing, leather processing, water treatment, pharmaceuticals, mining, and organic synthesis. It primarily functions as an antioxidant, antibacterial agent, reducer, and bleaching agent, and is a well-established and stable basic chemical product.
Q2: What grades do you offer? How do I choose the appropriate grade?
We offer industrial grade, food grade, and high-purity grade Sodium Metabisulfite.
Industrial grade: Suitable for water treatment, textiles, printing and dyeing, leather, mining, etc.
Food grade: Suitable for food preservation, juice, brewing, etc.
High-purity grade: Suitable for pharmaceuticals, fine chemicals, and other applications with higher impurity requirements.
If you are unsure which type to choose, we can recommend the appropriate specification based on your specific application and target market.
Q3: What precautions should be taken during the transportation and storage of the product?
Sodium Metabisulfite is sensitive to moisture and air. We recommend:
Storing in a cool, dry, and well-ventilated place.
Using sealed packaging to prevent moisture absorption.
Keeping away from strong acids.
All our export packaging meets international shipping requirements and is suitable for sea freight and long-term storage.
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