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Ethylene glycol is an organic compound with the formula HOCH2CH2OH. It is a simple diol, which is a type of alcohol. It is a colorless, odorless, viscous liquid that is miscible with a wide range of solvents. It is primarily used as an antifreeze in automobile radiators and as a raw material in the production of polyester fibers and resins.

Ethylene glycol is produced commercially from ethylene through the intermediate ethylene oxide. The reaction of ethylene oxide with water yields ethylene glycol. This process is highly exothermic and requires careful temperature control.

Ethylene glycol has a sweet taste, which can make it attractive to children and animals, but it is toxic if ingested. Ingestion can cause central nervous system depression, cardiac problems, and kidney damage. Due to its toxicity, it is often denatured with bittering agents to discourage consumption.

In addition to its use as antifreeze, ethylene glycol is a component in hydraulic fluids and in the production of certain plastics. It is also used as a humectant in some cosmetic and personal care products. Its low freezing point and high boiling point make it suitable for applications where temperature regulation is critical. It is important to handle ethylene glycol with care and to follow safety guidelines to prevent accidental exposure or ingestion.