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Ethylene glycol is an organic compound with the formula C2H6O2. It is a colorless, odorless, viscous liquid that is miscible with water. Ethylene glycol is primarily used as an antifreeze in automotive cooling systems and as a raw material in the production of polyester fibers and resins.

Its sweet taste makes it appealing to animals, but it is highly toxic if ingested. Symptoms of ethylene glycol poisoning in humans include nausea, vomiting, abdominal pain, and central nervous system effects, progressing to kidney damage and potentially death. Due to its toxicity, it is often denatured with bittering agents in consumer products to deter accidental ingestion.

Ethylene glycol is produced industrially by the hydration of ethylene oxide. The process involves reacting ethylene oxide with water at high temperatures and pressures. Its widespread use in various industries, coupled with its hazardous nature, necessitates careful handling, storage, and disposal protocols. Environmental regulations are in place to minimize its release into the environment.