Teflon

google

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1940s: from tetra- ‘four’ + fluoro- + -on on the pattern of words such as nylon and rayon .

wiktionary

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Genericization of trademark Teflon.

etymonline

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Teflon (n.)

commercially important synthetic polymer, 1945, proprietary name registered in U.S. by du Pont, from chemical name (poly)te(tra)fl(uoroethylene) + arbitrary ending -on; popularized as a coating of non-stick pans in 1960s; metaphoric extension, especially in reference to U.S. President Ronald Reagan, is attested from an Aug. 2, 1983, speech on the floor of Congress by Pat Schroeder.