Sodium Metabisulphite (Na2S2O5)

This is our most popular Sodium Metabisulphite (Na2S2O5) - Sodium Metabisulphite Food Grade

Sodium Metabisulphite Food Grade

Sodium Metabisulphite Food Grade


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Buy Sodium Metabisulphite from Leading UK Suppliers

ReAgent has been a leading UK chemical supplier for over 40 years. With accreditation to a number of ISO Standards, as well as a 100% quality guarantee on every product, we have the knowledge and experience to handle all of your business needs.

You can buy sodium metabisulphite from our online chemical shop in 25kg bags. We supply this product for analytical as well as food grade use, and the full MSDS is available to download from our website.

Order online today where you can also get nationwide next-day delivery and discounts on bulk orders. We have extra, industry-leading services available on all products, including personalised labelling, customisable packaging and the choice of specific pack sizes. Simply contact us for further information.

What is Sodium Metabisulfite?

Alternatively spelt metabisulfite, sodium metabisulphite is an inorganic compound commonly used as a preservative and disinfectant agent. While it still has a wide range of uses, this compound is slowly being replaced with alternative substances due to its toxic by-products.

One example is its reaction with water, strong acids (reaction 1) or its behaviour at high temperatures (reaction 2). These reactions result in the production of sulphur dioxide (SO2), a pungent and unpleasant gas that can be toxic.

Reaction 1: Na2S2O5 + 2 HCl †’ 2 NaCl + H2O + 2 SO2

Reaction 2: Na2S2O5 †’ Na2SO3 + SO2

How is Sodium Metabisulphite Prepared?

This compound can be prepared by mixing sodium bisulfite and sulphur dioxide in a saturated solution. This is then followed by evaporation, leaving behind sodium metabisulphite.

Uses and Applications

While this compound has an array of applications, from precipitating gold from auric acid to testing for sickle cell anaemia, its two most common applications are in the food and cleaning industry:

  • Food Additive: with the E-number E223, this compound is commonly used as a preservative and antioxidant in many foods. However, it can cause allergic reactions and respiratory problems, which can be especially dangerous to those who suffer from asthma or any other chronic condition
  • Cleaning Agent: it can be used industrially to clean and sanitise large equipment. It is used in homebrewing and winemaking to do the same thing. Sodium metabisulphite is also used in reverse osmosis membranes and it can also eliminate chloramine in drinking water

Friendly Service, Quality Products

At ReAgent, we strive to offer all our customers a friendly service. Our products, including sodium metabisulfite, are backed by a 100% quality guarantee so that you can relax and buy with confidence.

Place your order online today, or contact our technical sales team for more information. We'll be happy to help you before, during and even after your purchase.