Sodium Metabisulphite

It is used as a preservative and antioxidant in food. It is used as a cleaning agent for potable water desalination systems and used to remove chloramine from drinking water after treatment.


Molar Weight190.095 g/mol
Melting Point170 °C
Density1.310 – 1.370 g/cc
FormsPowder, White, Yellow

Uses and Applications

Key applications

  • Hair care
  • Fabric, textile and leather products
  • Water treatment
  • Cleaning products
  • Preservative
  • Wine production
  • Pharmaceuticals
  • Laundry products
  • Building & Construction products


  • Pharma
  • Cleaning
  • Cosmetics
  • Food

Synonyms: Disodium Pyrosulfite, E 223, SMBS, Sodium Bisulfite Anhydrous, Sodium Disulfite, Sodium Hydrogen Sulfite, Sodium Pyrosulfite

Chemical Formula: Na2S2O5

CAS Number: 7681-57-4