What is Caustic Soda Flakes? Caustic soda flakes, also known as sodium hydroxide flakes or NaOH flakes, are white solid flakes with a chemical formula of NaOH. It is a highly caustic and reactive compound that is used in a variety of industrial and household applications. Caustic soda flakes are commonly used in the manufacturing of soap, detergents, and paper products, as well as in the production of textiles, aluminum, and various chemicals. It is also used as a strong base in chemical processes such as pH adjustment, neutralization, and in the production of biodiesel. Due to its corrosive and hazardous nature, caustic soda flakes must be handled with care and appropriate safety measures, such as wearing protective clothing and using proper storage and handling procedures, should be taken to avoid accidents and injury.