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Potassium Metabisulphite 97%

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Price: £20.95

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Stock Availability

On Shelf - Approx. UK delivery date: Wednesday the 17th September 2025*

In bulk stock - ships within 10 - 12 Working Days (Excluding weekends and public holidays)

4 to 6 weeks approx. (Not guaranteed)

UK Shipping

Unfortunately, we are not currently accepting orders for Northern Ireland.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed

Applications

Reducing agent in chemical reactions
Preservative and antioxidant in analysis
pH adjustment in certain reactions
Participates in oxidation-reduction processes
Used in polymerisation reactions
Metal surface treatment and passivation
Component in photographic developers
Studied as an antioxidant in research

General

What is Potassium Metabisulphite? Also known as potassium pyrosulfite, it is a white crystalline powder with a pungent sulphurous odour. It's primarily used as a preservative, antioxidant, and chemical sterilant in various applications, including food and beverage production, winemaking, and water treatment. In winemaking, it's used to inhibit the growth of wild yeasts and bacteria, effectively preventing spoilage. It also acts as an antioxidant, improving the physical stability and shelf life of beer and wine.

Consistent Quality: We provide only high-quality Potassium Metabisulphite, ensuring reliable and consistent performance for all applications.

Shipped from Manchester, UK Facility: Sourced and packaged in non-toxic, chemical-resistant containers to ensure safe handling and preserve product quality during transport.

Frequent Uses

Food and Drink
Prevents microbial growth and oxidation, thus preserving the colour, flavour, and freshness of food and beverages.

Winemaking
It's a crucial ingredient in winemaking, acting as a sterilant to eliminate unwanted microorganisms and as an antioxidant to prevent oxidation and browning.

Water Treatment
Can be used to remove free chlorine from tap water, preventing off-flavours in beer.

Specification

CAS Number: 16731-55-8
EINECS: 240-795-3
Molecular Weight: 222.32
Molecula Formula: K2S2O5
Physical Description: White Crystalline Powder
Solubility (2% in water): Clear, Colourless Solution
Iron (Fe) <10ppm
Selenium (Se): <5ppm
Arsenic (As): <3ppm
Lead (Pb): <2ppm
Mercury (Hg) <1ppm
Heavy Metals (as Pb): <10ppm

Hazards

Hazard Phrases: Causes serious eye damage. Contact with acids liberates toxic gas.

Prec Phrases: Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

corrosive CLP Image