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Why are fluoroelastomers used in O-rings, seals, and gaskets?

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Fluoroelastomers are synthetic rubbers highly valued for O-rings, seals, and gaskets due to their exceptional durability in demanding environments. Their primary advantages include:

Environmental Resistance: They possess outstanding resistance to oxygen, ozone, and high temperatures, with service capabilities reaching up to 250 °C (480 °F).12
Chemical Stability: They are highly resistant to swelling when exposed to oils, fuels, and chlorinated solvents.12

These properties make them the material of choice for aerospace and industrial equipment that must operate under severe conditions. However, they are not universal solutions; they can be degraded by steam, are susceptible to swelling by ketones and ethers, and lose their elasticity by becoming glassy at temperatures near room temperature.12