An antifreeze is an additive that lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. Common antifreeze increases the boiling point of the liquid, allowing higher coolant temperature.
Coolant is a mixture of water and antifreeze. Antifreeze lowers the freezing point of the mixture and raises the boiling point, and it contains additives that prevent corrosion and lubricate pump seals. Ethylene glycol is the main ingredient of antifreeze, with the additives making up 10% or less of the total. A 50/50 mixture is generally recommended, and this provides freezing protection down to -34°F (-36.7°C) and boiling protection up to 265°F (129°C).
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