Khanyetso e Feteletseng ea Lik'hemik'hale: Li-ring tsa FFKM O-rings li hanyetsa mefuta e mengata ea lik'hemik'hale, li-solvents, li-acids, le lintho tse ling tse senyang, tse etsang hore li tšoanelehe ho sebelisoa ha ho hlokahala lik'hemik'hale.
Ho hanyetsa Mocheso o Phahameng: FFKM O-rings e ka mamella mocheso o phahameng ho fihlela ho 600 ° F (316 ° C) ntle le ho senya, 'me maemong a mang, ho fihlela ho 750 ° F (398 ° C).