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aspearin1, I tried heating the solution, but the precipitate did not go back into solution. Thanks for the idea, but it appears i am not experiencing the same effect you saw with methanol solution. Do you have any other thoughts?

I can send it off to a lab, but I thought I would try here first to see if anyone had any information at hand to save some time.

I am conducting testing to find a fluid for a valve to be used in the petroleum industry; this fluid will consequently see exposure to gasoline and ethanol. Testing has consisted of bubbling ethanol vapor though a jar of propylene glycol, which is our leading candidate. Propylene glycol has...