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Selecting a heat transfer oil

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We've got a small appliance with an electric heating element submerged in an oil bath acting as a heat transfer fluid. We've been using vegetable oil due to it being food-grade, but we've been having trouble with some smoking when we run it at 170 degrees C. Looking at other alternatives, and curious about food-grade mineral oil or glycerine. Both of which I can get in gallon quantities at a reasonable price, and both seem to have higher flash points than cooking oil. Any opinions of these, or any suggestions for other alternatives?

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