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Old 02-13-12, 08:20 AM   #1
Daox
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Default Max water temp for glycol solar panel?

I've read in a few places that too high of temperatures really cause glycol antifreeze to break down. However, I can't remember any specific temperature that they say to stay below. Does anyone know off hand?

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Old 03-06-12, 02:43 PM   #2
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I just found the answer to my own question in an issue of HomePower magazine.

Quote:
The buffer breakdown temperature of generic propylene occurs at about 285F. A few years ago, The Dow Chemical Co. introduced DowFrost HD, which has a maximum temperature of 325F.
So, it seems you can get an antifreeze system REALLY hot before the glycol is a problem. I think other plastics in the system will become a problem before the antifreeze starts to break down.

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