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These two fluorocarbon polymers seem to me very similar, the only difference I see is that FFKM is elastomer while PTFE aka Teflon is more of hard type of plastic.

Isn't FFKM just PTFE with lower average molecular weight, that is the average molecule is shorter chain so its softer? Is the production of these two polymers vastly different or is the process mostly same?

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Teflon (PTFE) and Kalrez (FFKM) are different polymers.

PTFE is made from tetrafluoroethylene, and contains only carbon and fluor. The material is stiff.

FFKM is made from tetrafluoroethylene, vinylidene fluoride and perfluoromethylvinylether, so besides carbon and fluor, it also contains hydrogen and oxygen. These additional monomers make the polymer an elastomer.

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  • $\begingroup$ Is it possible to make elastomer from just carbon and fluorine atoms? $\endgroup$ – wav scientist Aug 27 '18 at 7:30
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    $\begingroup$ I am not sure. Parofluor, another trademark FFKM polymer, does not use vinylidene fluoride, so it does not contain hydrogen. But oxygen is still there. There are elastomers made with only carbon and hydrogen containing monomers so, theoretically, it should be possible by using the equivalent perfuorinated compounds. $\endgroup$ – Raoul Kessels Aug 27 '18 at 7:44

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