My RV antifreeze froze!
Just -27 C yesterday and I happened to notice the pink stuff in the toilet bowl was solid. Not like water ice; more like frozen slushy. The antifreeze in the jug marked good to -50C was the same. I...
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Wikipedia wrote:
Like ethylene glycol, propylene glycol is able to lower the freezing point of water, and so it is used as aircraft de-icing fluid.[5][16] Water-propylene glycol mixtures dyed pink to indicate the mixture is relatively nontoxic are sold under the name of RV or marine antifreeze. Propylene glycol is frequently used as a substitute for ethylene glycol in low toxicity, environmentally friendly automotive antifreeze. It is also used to winterize the plumbing systems in vacant structures.[17] The eutectic composition/temperature is 60:40 propylene glycol:Water/-60 °C.[18][19] The -50°F/-45 °C commercial product is, however, water rich; a typical formulation is 40:60.[20]
Usually get one of these posts a year
