Caustic Soda 4% / EDTA 4%

27th October 2018



An image showing Caustic Soda 4% / EDTA 4% in a 2.5litre container

Why Buy Caustic Soda 4% / EDTA 4% Online from UK Chemical Suppliers, ReAgent Chemicals?

We sell Caustic soda 4% / EDTA 4% in 2.5L containers, with discounts available for bulk orders over 4 items. We offer further options with all our products, including customised labelling and specific pack sizes. Simply contact us for further information.

Why add EDTA?

Caustic is a very effective cleaning agent. It’s particularly useful to dissolve organic matter and it’s used in many industries dealing with such residues, including breweries, distilleries and others. In addition, caustic soda has some antibacterial properties, which is an added bonus in this type of environment.

However, caustic soda used alone can become problematic in areas with hard water. Under alkaline conditions, caustic soda promotes the precipitation of carbonate and other salts, which may affect the entire plant with a whitish film left on every surface after cleaning.

This problem can be solved by the addition of EDTA (Ethylene  Diamine Tetra-acetic Acid) to the cleaning solution, effectively keeping carbonate, as well as calcium and magnesium-containing salts dissolved.  However, EDTA cannot prevent formation of scale, when its main component are silica-based compounds. Other compounds with similar properties include sodium hexametaphosphate or sodium gluconate.

This is only one of the many different types of additives which can be added to caustic soda to enhance its cleaning properties. Examples include metasilicates, phosphates and surfactants to disperse and maintain in solution both organic and inorganic compounds.

Over 30 years’ experience

We offer all our customers our expertise accumulated over 30 years, with high quality products and excellent customer service care. A member of staff will be glad to assist you before, during and after your purchase, to ensure it meets with your requirements. All our products come with 100% quality guarantee and are usually shipped within 24 hours. Simply contact us for a quote or free technical advice.


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