Kulowetsedwa kwa PTFE sikungokhala ndi nsalu za fiberglass. Nkhaniyi ikuwonetsa magawo asanu ndi awiri amtundu wina - aramid, carbon fiber, PBI, porous metal, graphite, asbestos (ochotsedwa), ndi zodzaza ndi ceramic - ndi machitidwe awo, ubwino, malire, ndi ntchito zazikulu.

Nkhaniyi ikufotokoza chifukwa chake nsalu ya fiberglass yopanda alkali ndiye gawo lapansi lokondedwa la nsalu za PTFE zotentha kwambiri. Imakhudza kulumikizana kwamankhwala kudzera pa ma silane coupling agents ndi zinthu zofunika kwambiri monga kukhazikika kwamafuta, kukhazikika kwa mawonekedwe, komanso kukana kwa dzimbiri - kuwonetsetsa kuti zikugwira ntchito kwanthawi yayitali m'malo ovuta.