Ross Kean
Posts: 686
Joined: 6/4/2002 From: Fredericton,
NB, CANADA Status: offline
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I don't know whether this a function of different practices in different places, but in this part of the world, windshield washer antifreeze contains methanol and water, not isopropanol (much lower freezing point). Gasline antifreeze (here) is mostly methanol - you would never add water since that is what you are trying to eliminate. (Methanol is a good co-solvent) Rubbing alcohol (here) is principally isopropanol (70%) and water. On the topic of denaturents, they are added to ethanol to prevent their use for consumption and the reasons (as pointed out) relate mostly to taxes. Ethanol is a useful industrial chemical/solvent, but something has to be added so people won't substitute it for the taxed stuff. Denaturents may include bittering agents, methanol, phenolphthalein, hydrocarbon mixtures etc., depending on the application. All I have to say on the subject! Ross
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