Triethylene Glycol (TEG) is the third members of a homologous series of dihydroxyalcohols. TEG is produced in the Master Process by the direct hydration of ethylene oxide. TEG is co-produced with MEG and DEG. TEG is a colourless liquid.The main uses for triethylene glycol are based upon its hygroscopic quality. It is used as a dehydrating agent for natural gas pipelines where it removes the water from the gas before being condensed and reused in the system. It is also a dehumidifying agent in air-conditioning units.It is also used to make chemical intermediates such as plasticisers and polyester resins. It is an additive in hydraulic fluids and brake fluids, and TEG is also used as a solvent in many applications, including as a selective solvent for aromatics, and a solvent in textile dyeing.Triethylene glycol also has mild disinfectant qualities and, when volatised, is used as an air disinfectant for virus and bacteria control.