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Old 06-23-2009, 02:36 PM   #1
stephelton
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Oct 2008
Colorado Springs, Colorado
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The melting point of ethylene glycol is -12.9° C, while the melting point of propylene glycol is -59 °C. I was under the impression that pure ethylene glycol is favorable for use in cooling solutions, but it freezes "sooner," and seems to be very difficult to find. Which is favorable, and why? Where might I search (preferably locally) for either?

Thanks!

 
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Old 06-23-2009, 03:02 PM   #2
uncia
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Nov 2008
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Here is a fantastic article: http://www.prochiller.com/files/AllAboutGlycol.pdf

In short, use propylene glycol. You can buy the RV PG but it may degrade faster.

 
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Old 06-23-2009, 03:59 PM   #3
gruversm
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I use Dow Frost (DuPont) RV glycol in my system.

 
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Old 06-23-2009, 05:14 PM   #4
ClaudiusB
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Dec 2007
El Paso, Texas
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I use between 20%-30% RV propylene glycol for my water chiller.

One thing to remember is the potential of slush creation.
The glycol and water mixture should not be used close to the freezing point, pump and valves will have a hard time.


Cheers,
ClaudiusB

 
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Old 06-24-2009, 09:30 PM   #5
stephelton
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Oct 2008
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Thanks for the input. That PDF has some very good info in it.

 
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