Or if they’re even significant. Shade tree mechanics are ill equipped to do this testing. Instead of guessing what the goo is, run FTIR and find out with certainty. You’ll know the source then. The mechanic consistently mispronounces Buna so he’s a rookie for sure. And nitrile is a modern material. Chloroprene was the traditional fuel resistant elastomer. And you may not want to shove fluoropolymer into every application. Some of them will rely on some swell to do their job; the cork gasket is a good example.
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