China Caustic Soda Pearls 99 is a strong alkali with high corrosivity. This alkaline substance is deliquescentand will absorb water vapor in the air, as well as acid gases such as carbon dioxide. Sodium hydroxide generally has two forms: solid and liquid. Liquid sodium hydroxide is the aqueous solution of sodium hydroxide; solid sodium hydroxide is processed from liquid sodium hydroxide and is divided into three different forms: caustic soda flake, granular caustic soda and caustic soda solid. The main difference among caustic soda flake, granular caustic soda and caustic soda solid is their form, which are flake, block and granular respectively.