Okufukirira kwa PTFE tekukoma ku lugoye lwa fiberglass. Ekiwandiiko kino kyanjula 7 alternative substrates – aramid, carbon fiber, PBI, porous metal, graphite, asbestos (phased out), ne ceramic fillers – n’enkola yaabwe, ebirungi, obuzibu, n’okukozesebwa okukulu.

Ekiwandiiko kino kinnyonnyola lwaki olugoye lwa fiberglass olutaliimu alkali lwe lusinga okwettanirwa olugoye olwa PTFE olw’ebbugumu eringi. Kikwata ku kukwatagana kw’eddagala nga bayita mu bikozesebwa ebiyunga silane n’ebintu ebikulu eby’omubiri nga okunyweza ebbugumu, okunyweza mu bipimo, n’okuziyiza okukulukuta – okukakasa okukola okumala ebbanga eddene mu mbeera enkambwe.