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mixing glycol

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Bob Gagnon plumbing and heating
Bob Gagnon plumbing and heating Member Posts: 1,373
in THE MAIN WALL
can i add pink glycol to a solar heating system that already has yellow glycol. the customer drained 1 gal. or so. thanks, bob
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  • Terry
    Terry Member Posts: 186
    Mixing Glycols

    Hi Bob ! Long time no see. Nice to see fellow Canadians on the wall.

    Re: glycols. You should not mix ethylene & propylene glycols. If the two are of the same type, it shouldn't be a problem.

    You may want to test final solution to check if any additional inhibitors or additives are needed.

    Regards,
    Terry T
    Frontier - Edmonton
  • hr
    hr Member Posts: 6,106
    Glycol blends

    The engineers at Dow Heat Transfer Fluids division have told me mixing propylene and ethylene is not a problem IF they are inhibited the same.

    For instance mixing hydronic inhibited with automotive would not be a good idea. The inhibitor packages that are added are completely different and not compatiable.

    Can't really tell by the color what you have. Dowfrost propylene is a different color from Dowfrost HD even though they are both propylene glycols! Different brands are different colors also.

    I don't know of any way to determine ethylene from propylene, in the field. Same with hydronic from RV from automotive. Need a lab to decipher the solution. Hope this helps.

    hot rod

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