Caustic soda Lye is an inorganic compound. It is a white solid and highly caustic metallic base and alkali of sodium which is available in pellets, flakes, granules, and as prepared solutions at different concentrations. Sodium hydroxide forms an approximately 48% (by mass) saturated solution with water. Sodium hydroxide is soluble in water, ethanol, and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air.


Caustic Soda Lye is a popular strong base used in industry. Around 56% of CSL produced is used by industry, 25% of which is used in the paper industry. CSL is also used in the manufacture of sodium salts and detergents, pH regulation, and organic synthesis. It is used in the Bayer process of aluminum production. In bulk, it is most often handled as an aqueous solution, since solutions are cheaper and easier to handle. CSL is used in many scenarios where it is desirable to increase the alkalinity of a mixture, or to neutralize acids.


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