What is 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.

  • Synonyms: Potassium pyrosulphite, Dipotassium disulfite, Dipotassium disulphite
  • INCI: Potassium Metabisulphite
  • Chemical Formula: K2O5S2
  • CAS Number: 16731-55-8

Product Specifications

Chemical Formula K2O5S2
CAS Number 16731-55-8
Molar Weight 222.312g/mol
Specific Gravity 2.34
Melting Point 190 °C
Forms White crystalline powder
Grades Food Technical
Variations Granular Powder

Uses and Applications for Potassium Metabisulphite

Key Applications

  • Dyeing
  • Food additive
  • Food preservative


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

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