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Caustic Soda Solution (NaOH 50%)

Caustic Soda Solution (NaOH 50%)

Caustic Soda Solution is a clear, colorless, odorless and slightly viscous liquid. It is miscible with water at any ratio. Caustic Soda Solution reacts strongly alkaline and is highly corrosive to various materials.




Processing and Applications

Caustic Soda Solution is a strongly alkaline product, which is applied as a chemical reactant or neutralization agent in various areas, e.g. in chemical, pharmaceutical, textile, pulp and paper, metal and food industries, for agriculture, soap and detergent manufacturing or waste water treatment. Caustic Soda Solution reacts strongly alkaline and is highly corrosive and aggressive to various materials such as aluminum, magnesium, zinc, glass, emaille and many plastic products.

Product Information



Packaging, Delivery and Storage

Caustic Soda Solution is transported via railcar or road tanker. Above 25°C and for long storage times, Caustic Soda Solution should be kept away from air. If exposed to air, Caustic Soda Solution will pick up carbon dioxide to form sodium carbonate, which may cause haze of the solution. In order to prevent carbonate formation, storage vessels should have minimized exposure to air, but a venting possibility to equilibrate pressure during unloading or transfer processes. Heatable storage containers for Caustic Soda Solution are recommended in order to prevent crystallization during the cold season. Caustic Soda Solution starts to freeze at temperatures as high as 10-12°C. When stored properly under the conditions recommended, Caustic Soda Solution has a virtually unlimited shelf life.

Food Compliance

NaOH 50% fulfils the criteria of purity for food additives according to Zusatzstoff-Zulassungsverordnung (ZZulV), Zusatzstoff-Verkehrs-Verordnung (ZVerkV), Food Chemicals Codex (FCC) and of products for water treatment concerning to human applications referred to DIN EN 896.

NaOH is registered within the EU as a food additive E 524.

Diluting NaOH 50% you strictly have to avoid procedures where microorganisms could be transported into the product (e.g. using cleaned and sterile containers/vessels, sterile pure VE-water, short time storage's, convenient temperature etc.).

General Information

Safety data, transport information and toxico logical data are provided in the current EU safety data sheet.

Some applications for this product can be subject to national and / or international standards (food additives, wastewater treatment, in the Pharmaceutical Industry,..). The customer is solely liable for ensuring that all existing patents and regulations are respected applicable to our products and their applications.

We assume that NaOH 50% is free from organic traces/impurities. Caustic soda is produced in a complete inorganic and closed process. Furthermore the rail tank waggons are used for transportation of NaOH only. For road tank cars and ship tanks we arrogate an applicable cleaning certificate before filling them with NaOH. All traces and impurities can be seen from our standard delivery specification.

For requests please contact our marketing and sales contacts.





Density of various Caustic Soda Solutions as a function of temperature


Values of solutions below 50% (w/w) taken from „Int. Crit. Tables”, 3rd edition, page 79; values of solutions above 50% (w/w) were determined by extrapolation.




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