FKM O-ring e emetse Fluoroelastomer O-ring e leng mofuta oa rabara ea maiketsetso e entsoeng ka fluorine, carbon, le hydrogen.E tsebahala ka ho hanyetsa mocheso o phahameng haholo, lik'hemik'hale tse matla, le mafura a etsang hore e be khetho e tsebahalang bakeng sa ho tiisa lits'ebetso liindastering tse kang tsa likoloi, sefofane le lisebelisoa tsa lik'hemik'hale.FKM O-rings e boetse e tsejoa ka ho tšoarella ha eona, elasticity, le ho hanyetsa sete ea compression.