Potassium metabisulphite - K2S2O5

Potassium metabisulphite - K2S2O5

The main use for Potassium metabisulphite, also known as Potassium Pyrosulphite, is as an antioxidant or chemical sterilant.


Resource Chemical are able to supply Potassium Metabisulphite as free-flowing crystalline powder.


Product Name: Potassium Metabisulphite Food Grade

Description: Free-flowing crystalline powder with odour of SO2

Formula: K2S2O5

Synonyms: Anhydrous Potassium Bisulphite, Potassium Pyrosulphite, Potassium disulphite

Molecular weight: 222.33

Bulk density: 1.2-1.3 kg/dm3

Appearance: White free-flowing crystalline powder

Appearance of 20% Solution: Clear and colourless or pale yellow



  • Potassium metabisulphite is sometimes added to lemon juice as a preservative.
  • Potassium metabisulphite is used within the textile industry for dyeing and cotton printing.
  • Potassium metabisulphite can be used to precipitate gold from solution in aqua regia (as an alternative to sodium sulfite).
  • Certain photographic developers and solutions used in photographic fixing make use of Potassium metabisulphite.
  • Used in some pickles as a preservative
  • Used as a bleaching agent in the production of some Coconut creams



Potassium metabisulphite - K2S2O5

If you require any further information on our Potassium Metabisulphite, General Chemical products or any of our specialist chemical ranges, please speak with your sales representative or call us on 01280 843800 or at sales@resourcechemical.ltd.uk

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Reach is an EU regulation concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals which came into force in June 2007.


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contact our sales team on 01280 843800 or

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