Hi, I am trying to find out if there is such a thing as a published vapor pressure for polyethylene glycol 400 at a elevated temperature. SDS's I have found show the vapor pressure is < 0.01 mm Hg psi at 20C. My application is using PEG400 at about 300 F. The problem is that a state regulator is trying to say that there are VOC's being emitted from the PEG400 solution and since they can't find a vapor pressure for PEG400 at elevated temperature, they are assuming ethylene glycol, which is not even close to the same thing as PEG400. I would expect PEG400 to have a much lower vapor pressure than ethylene glycol at 300F. Does anyone know of a resource that either indicates how to estimate a vapor pressure at elevated temperature for PEG400 or supporting documentation that it is very very low, like less than 0.1 psi or something?
-Ryan Birkenholz, Licensed PE in MN and IA
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