Antifreeze
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An antifreeze is an additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. Common antifreezes also
Fluorescent green-dyed antifreeze is visible in the radiator header tank when car radiator cap is removed
Propylene glycol
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Propylene glycol is a viscous, colorless liquid. It is almost odorless and has a faintly sweet taste. Its chemical formula is CH3CHCH2OH. As it contains two alcohol groups, it is classified as a diol.
Antifreeze
…proper antifreeze, a wide temperature range can be tolerated by the engine coolant, such as −34 °F (−37 °C) to +265 °F (129 °C) for 50% (by volume) propylene glycol diluted with distilled water and a 15 psi pressurized coolant system. Early engine coolant antifreeze was methanol (methyl alcohol). Ethylene glycol…
Propylene glycol is commonly used to de-ice aircraft.
Propylene glycol is often used in electronic cigarettes.