Dhimista kulaylka dharka Fiberglass waa sababta koowaad ee PTFE cajal la'aanta cabbirka. Heerkulka PTFE sintering (360-400°C), culayska haraaga tolida ayaa la sii daayaa. Haddii aan la xakameynin, dharka ayaa hoos u dhacaya; Haddii la xakameeyo, diiqada qarsoon ayaa xiran, taasoo keenta hoos u dhac dambe inta lagu jiro daaweynta koollada (150-200 ° C) iyo isticmaalka dhamaadka isticmaalka. Xalka: isticmaal fiberglass-kuleyl hore loo dejiyay oo leh <0.5% dhimis at 400°C, baabi'inta walbahaarka haraaga ka hor dahaadhka.