that's a good question. . .the only other items I can think of would be mineral water and oil/silicon based liquids. All of them are poor thermal conductors when compared to water and the oil/silicon based liquids leave a nice coat on anything you put in them. I think that's why flourinert is so expensive. . .there isn't really anything else like it. I'm sure there's some no-name company somewhere that makes a similiar product for half the price or less but I don't know of any.
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