Octadecyltrichlorosilane

Octadecyltrichlorosilane is an organosilicon compound with the formula. A colorless liquid, it is used as a silanization agent to prepare hydrophobic stationary phase, for reversed-phase chromatography.
It is also evaluated for forming self-assembled monolayers on silicon dioxide substrates. Its structural chemical formula is CH₃₁₇SiCl₃. It is flammable and hydrolyzes readily with release of hydrogen chloride.
Dodecyltrichlorosilane, an ODTS analog with shorter alkyl chain, is used for the same purpose.
ODTS-PVP films are used in organic-substrate LCD displays.