"Polytetrafluoroethylene has excellent chemical stability and corrosion resistance. It is one of the best corrosion-resistant materials in the world today. It can withstand all other chemicals except molten alkali metals, chlorine trifluoride, chlorine pentafluoride and liquid fluorine. It does not change even when boiled in aqua regia."
You can see why DuPont invented it for the uranium hexafluoride gas diffusion plant at Oak Ridge.
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