Sodium Metabisulfite CAS 7681-57-4

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Sodium Metabisulfite

Name: Sodium Metabisulfite

Cas: 7681-57-4

Purity: 99%min


Directory Guidance on Sodium Metabisulfite

Chemical Structure

Sodium Metabisulfite

Basic Info:

CAS No:7681-57-4
Stock AvailabilityIn stock
Brand NameLook chemical

Product Introduction:

Sodium metabisulfite, likewise called partial weight salt sulfite or E223, chemical formula Na2S2O5, is a not natural substance that can be used as a chemical, antioxidant and also disinfectant.

In general, it is white or yellow crystalline powder or small crystal with solid SO2 odor. When spoken to with strong acid, SO2 is launched to create matching salts.

Sodium Metabisulfite generates sodium sulfite when reacting with caustic soda or soda ash solution, and can generate adducts with aldehydes.

Safety to human body:

Although sodium meta bisulfite can be used for bleaching and preservative of food, its dosage should be strictly limited because sodium metabisulfite has great damage to human body.

Individuals who are sensitive to sulfites might trigger allergic reactions, consisting of breathing responses in asthmatics, anaphylaxis, and various other allergies in sensitive individuals.

Nature and Specifications:

Product Packaging


Product Usage:

Sodium metabisulfite raw materials are divided into industrial grade and food grade, and their quality indicators are different.

Food grade sodium metabisulfite: 

  • Food grade sodium meta bisulfite can be used as a bleaching agent and leavening agent for foods such as biscuits and cakes, a nutrient retention agent for dehydration of vegetables, a preservative for fruit storage, and a bactericidal preservative for brewing and beverages.
  • In the food industry, it is used as preservatives, bleaching agents, antioxidants, bulking agents, flour improvers, color retention agents and preservatives, etc.

Industrial quality salt metabisulfite is widely used, and its primary usages are as adheres to:

  • Pharmaceutical industry: utilized in the manufacturing of chloroform, phenylpropyl sulfone and also benzaldehyde.
  • Rubber market: salt metabisulfite can be utilized as coagulant.
  • Printing and dyeing market: used as a dechlorination representative for cotton cloth after whitening, as well as a cotton cloth searching agent.
  • Tanning market: used for natural leather handling, it can make leather soft, plump, tough, water-proof, anti-folding, wear-resistant as well as other residential or commercial properties.
  • Chemical sector: made use of in the manufacturing of hydroxyvanillin, hydroxylamine hydrochloride, etc.
  • Photosensitive market: made use of as programmer, etc.

The production of sodium pyrosulfite in our factory has strict quality control to meet the needs of most users. Customers with special requirements can contact for customization.

If you need more product information, you can click the online window in the lower right corner or send an email to contact us to get food-grade or industrial-grade sodium metabisulfite samples for inspection.

Precautions For Use:

The following points should be noted when using sodium metabisulfite in processed foods:

  1. Sodium metabisulfite is a reducing bleach, and its solution is unstable and volatile, so it should be prepared and used immediately to prevent the sulfite from being unstable and volatile.
  2. The presence of metal ions in food can oxidize residual sulfurous acid, and can also oxidize and discolor the reduced pigment, thereby reducing the effectiveness of bleaching agents. Therefore, metal chelators are used at the same time in production.
  3. Materials bleached with sulfites are easily recolored due to the disappearance of sulfur dioxide, so generally excessive sulfur dioxide remains in food, yet the residual quantity needs to not exceed the standard.
  4. Sulfurous acid can not prevent the task of pectinase as well as will harm the communication of pectin. Additionally, after the sulfurous acid penetrates into the fruit cells, the sulfur dioxide can be removed by damaging the fruit during handling.
    Consequently, the fruit preserved with sulfurous acid is only ideal for making jam, dried out fruit, fruit a glass of wine, candied fruit, and so on, and also can not be used as canned resources.
  5. Sulfite can damage thiamine, so it is not easy to be made use of in fish food.
  6. Sodium metabisulfite quickly responds with aldehydes, ketones, healthy proteins, and so on.

Related References:

  1. “Sulfites and Metabisulfites of Alkali Metals” – Wiley Online Library | January 1, 1946.
  2. “Chemical Stability in Dosage Forms” – Google Books | Editors: Kevin M.G. Taylor, Michael E. Aulton.
  3. Wikipedia

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