Sodium metabisulphite

Sodium metabisulfite is the crystallized powder of sulfur dioxide. In order to produce sodium metabisulfite, various methods have been provided.

This compound can be produced by evaporating sodium sulfite solution saturated with sulfur dioxide gas.

The newest method of producing sodium metabisulfite in the world is using the wet gas process.

In this process, due to the direct contact of the gas with the substrate and under special conditions, the highest efficiency is obtained in terms of quantity and quality.

Molecular mass190.107 g/mol
Melting Point170 °C
AppearanceWhite powdery or crystalline solid


  • Water and sewage treatment
  • Textile and dye industry
  • Paper making industries
  • Pharmaceutical industries
  • Food industries
  • Chemical industries
  • Plastic industries
  • Construction industry
  • Photography


Sodium metabisulfite can be supplied in 25 kg bags.

Chemical Formula

  • Na2S2O5

Other names

  • sodium meta bisulfite
  • sodium pyrosulfite
  • pyrosulfurous acid
  • disodium salt

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