Silicone oil, English name for the Silicone oil, CAS number is 63148-62-9, the formula for C6H18OSi ₂, is a different degree of polymerization of organic siloxane polymer chain structure. The primary form of dimethyl cyclosiloxane is an organo-inorganic compound with dimethyl dichlorosilane as the main raw material, hydrolyzed and synthesized, with si-o bond as the main chain, and directly connected to the organic group on the silicon atom. Primary form dimethyl siloxane molecular structure rendering annular ring body, mainly including three six methyl siloxane (D3), eight four methyl siloxane (D4), ten methyl siloxane five (D5), twelve six methyl siloxane (D6), and three six methyl siloxane (D3) and/or eight four methyl siloxane (D4) and/or ten methyl siloxane five (D5) and six or twelve methyl siloxane (D6) content of 50% or more of colorless transparent or milky white liquid, flammable, without peculiar smell, insoluble in water, soluble in benzene and other organic solvents.