Caustic Soda Flakes is a highly versatile and inorganic compound with a white crystalline structure. It is an industrial chemical and is used in many manufacturing processes, cleaning agents, and home food products.Sodium hydroxide in solid form, also called caustic soda, is an inorganic chemical compound belonging to the strongest alkali. In solid form, it is a white substance with crystalline appearance (flakes). It has hygroscopic properties.