antivries

Antivries, the Dutch term for antifreeze or coolant, is a liquid added to internal combustion engine cooling systems to prevent the coolant from freezing in cold weather and to raise its boiling point, reducing the risk of engine damage in extreme temperatures. In addition to temperature control, antifreeze also provides corrosion protection and lubrication for metal components in the cooling circuit.

Most modern antifreeze is based on glycols, primarily ethylene glycol (EG) or propylene glycol (PG). Ethylene glycol offers strong performance but is highly toxic if ingested, making PG-containing formulations common where human exposure is a concern. Many brands use organic acid technology (OAT), HOAT (hybrid organic acid technology), or conventional silicate- and phosphate-based chemistries to extend service life and protect against corrosion.

Antifreeze is usually used as a concentrate diluted with water according to climate and vehicle specifications, commonly in ratios ranging from about 30% to 50% glycol. The color of coolant is brand-specific and does not reliably indicate chemical type. Regular replacement according to manufacturer intervals—often every 2 to 5 years or 30,000 to 60,000 miles—helps maintain protection.

Environmental and safety considerations are important. Ethylene glycol is toxic to humans and animals; spills should be cleaned promptly and disposed of as hazardous waste. Used coolant can be recycled through proper facilities. Store antifreeze in sealed containers away from children and pets.

See also: cooling system; glycol.