Sodium Sulphite Anhydrous

Other Trading Names:

  • Sodium Sulphite

CAS Number: 7757-83-7

HS Code: 28321000

Types of Packaging:

  • 25 kg/Bag
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Sodium Sulphite Anhydrous

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Chemical Name

Sodium Sulphite Anhydrous


≥ 96 %

Molecular Formula


CAS Number



White Crystal Powder

Grade Standard

Food Grade, Industrial Grade


Highly soluble in water

Melting Point



2.63 g/cm³

Chemical Description

  • Sodium Sulphite Anhydrous (SSA) is a chemical compound with the formula Na2SO3. It appears as a white to light yellow crystalline powder with a slight sulfur odor. This compound is notable for its high solubility in water, making it an effective solvent in various applications.
  • In the paper and pulp industry, SSA is used extensively as a bleaching agent, helping to remove lignin from wood pulp, thereby producing brighter paper. Its reductive and sulfonating properties are also exploited in the manufacture of cellulose and paper products.
  • Water treatment processes utilize SSA for dechlorinating water, removing excess chlorine, and preventing the formation of harmful chlorine by-products. It serves as an oxygen scavenger to prevent corrosion in water feed systems and boilers.
  • In the field of photography, Sodium Sulphite Anhydrous acts as a preservative for developing solutions, enhancing the shelf life and effectiveness of photographic chemicals.
  • The food industry benefits from SSA's preservative qualities, using it to prevent discoloration in dried fruits, vegetables, and some wines. It acts as an antioxidant, maintaining the color and freshness of food products.
  • Textile production employs SSA as a bleaching agent for wool and other textiles, ensuring consistent coloration and quality in fabric manufacturing.
  • SSA is also integral in various chemical synthesis processes, serving as a reducing agent in the production of chemicals, dyes, and pharmaceuticals.
  • Its role in environmental protection is emerging, particularly in technologies aimed at reducing air pollutants. SSA can be used to scrub sulfur dioxide (SO2) from industrial emissions, helping to mitigate air pollution.
  • Sodium Sulphite Anhydrous is explored for its potential in the development of environmentally friendly cleaning agents, thanks to its low toxicity and biodegradability.
  • Despite its extensive utility across industries, handling SSA requires care due to its potential to release sulfurous gasses upon decomposition or when reacting with acids. Safety measures and appropriate storage conditions are essential to ensure its safe use.
  • Sodium Sulphite Anhydrous stands out for its versatility, efficiency, and role in promoting sustainable industrial practices, making it a valuable commodity in a wide range of applications.
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Sodium Sulphite Anhydrous