Ethylene glycol is an organic compound widely used as an automotive antifreeze and a precursor to polymers. In its pure form, it is an odorless, colorless, syrupy, sweet-tasting liquid. Ethylene glycol is toxic, and ingestion can result in death.
Ethylene glycol is not to be confused with dierthylene glycol, a heavier ether diol , or with polyethylene glycol, a nontoxic polyether polymer.
The major end uses of ethylene glycol are to make pet melt, which accounted for 86% of total ethylene glycol consumption in 2009, and antifreeze, at around 7% of total consumption. Because this material is cheaply available, it finds many niche applications.