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The most common water-based antifreeze solutions used in electronics cooling are mixtures of water and either ethylene glycol (EGW) or propylene glycol (PGW). The use of ethylene glycol has a longer history, especially in the automotive industry.
Propylene glycol, also called propane-1,2-diol, is an organic compound with the chemical formula C 3 H 8 O 2. It is a viscous colourless liquid which is nearly odourless but possesses a faintly sweet taste.ike ethylene glycol, propylene glycol is able to lower the freezing point of water, and so it is used as aircraft de-icing fluid. Water-propylene glycol mixtures dyed pink to indicate the mixture is relatively nontoxic are sold under the name of RV or marine antifreeze.