Triethylene glycol (TEG), also known as triethylene glycol or diethylene glycol, has the molecular formula C6H14O4 and is an organic compound. TEG appears as a colorless or slightly yellow, transparent, viscous liquid, odorless and sweet-tasting. It is miscible with water in all proportions and soluble in organic solvents such as ethanol, propanol, toluene, and carbon tetrachloride. It is combustible, highly hygroscopic, and non-corrosive to metals, plastics, and rubber.