Silicone defoamers belong to auxiliary agent and it helps the elimination of foams formed in the production process. It is white and amber fluid. Silicone defoamers main component is silicone oil. It is not soluble in water, vegetable oils, animal oils and mineral oils. It can be resistant to high temperature as well as low temperature. Silicone defoamers is inert in chemical property, stable in physical property and has no biological property. Silicone defaomers are used in industrial area since 1960s, and is applied in different industrial fields. They are one of the most important auxiliaries in industrial areas like chemical industry, paper, coating, food, textile, and pharmaceutical area.