Potassium Metabisulphite

Potassium metabisulfite is a food preservative, which preserves the natural colour of food and protects food against bacteria. The winemaking industry uses it as an additive during the bottling process.


Molar Weight222.312 g/mol
Melting Point190 °C
Density2.34 g/cc
FormsPowder, White, Yellow, Pale, Crystalline

Uses and Applications

Key applications

  • Dyes
  • Food preservatives
  • Food additive
  • Antibacterial
  • Reducing agent
  • Wine production
  • Bleaching agent


  • Pharma
  • Cleaning
  • Coatings & Construction
  • Polymers
  • Water Treatment
  • Food
  • Animal Nutrition
  • Agrobusiness

Synonyms: Potassium pyrosulphite, Dipotassium disulfite, Dipotassium disulphite, Dipotassium Disulphite, E 224, PBMS, Potassium Pyrosulfite

Chemical Formula: K2O5S2

CAS Number: 16731-55-8