Polytetrafluoroethylene(Teflon kapena PTFE), yomwe imadziwika kuti "mfumu ya pulasitiki", ndi polima yopangidwa ndi tetrafluoroethylene pogwiritsa ntchito polymerization, yokhala ndi kukhazikika kwabwino kwa mankhwala, kukana dzimbiri, kutseka, mafuta ambiri osakhuthala, kutchinjiriza magetsi komanso kupirira bwino kukalamba.

PTFE ndi yosavuta kuzizira komanso kuyenda pansi pa kupanikizika komanso kutentha kwambiri, kotero nthawi zambiri imagwiritsidwa ntchito pa kupanikizika kochepa, kutentha kwapakati, dzimbiri lamphamvu ndipo sizilola kuipitsidwa kwa zinthu monga asidi wamphamvu, alkali, halogen, mankhwala ndi zina zotero. Kutentha kotetezeka kogwira ntchito ndi 150℃ ndipo kupanikizika kuli pansi pa 1MPa. Mphamvu ya PTFE yodzazidwa idzawonjezeka, koma kutentha kogwiritsidwa ntchito sikungapitirire 200℃, apo ayi kukana dzimbiri kudzachepa. Kupanikizika kwakukulu kogwiritsidwa ntchito kwa PTFE package nthawi zambiri sikupitirira 2MPa.

Chifukwa cha kutentha kwakukulu, zinthuzo zidzagwedezeka, zomwe zimapangitsa kuti kuthamanga kwa chisindikizo kuchepe kwambiri. Ngakhale kutentha kutakhala koyenera, pakapita nthawi, kupsinjika kwa pamwamba pa chisindikizo kudzachepa, zomwe zimapangitsa kuti "kupumula kwa nkhawa". Chochitikachi chidzachitika m'mitundu yonse ya ma gasket, koma kupumula kwa PTFE pad ndi koopsa kwambiri, ndipo muyenera kukhala maso.

Mphamvu ya PTFE yolimbana ndi mpweya ndi yaying'ono (kupsinjika kwa mpweya ndi kwakukulu kuposa 4MPa, mphamvu ya mpweya ndi 0.035 ~ 0.04), ndipo gasket ndi yosavuta kutulukira kunja mukayimangirira, choncho ndi bwino kugwiritsa ntchito pamwamba pa flange yokhotakhota ndi yokhotakhota. Ngati flange yosalala ikugwiritsidwa ntchito, m'mimba mwake wakunja wa gasket ukhoza kulumikizidwa ndi bolt kuti gasket isatuluke kunja.

Popeza zida zomangira galasi zimaphwanyidwa pambuyo popopera wosanjikiza wa enamel pamwamba pa chitsulo, wosanjikiza wa glaze ndi wofooka kwambiri, wophatikizidwa ndi kupopera kosafanana ndi kuyenda kwa wosanjikiza wa glaze, kusalala kwa pamwamba pa flange ndi kofooka. Gasket yachitsulo yokhala ndi chitsulo ndi yosavuta kuwononga wosanjikiza wa glaze, kotero tikukulimbikitsani kugwiritsa ntchito zinthu zapakati zopangidwa ndi bolodi la asbestos ndi rabara la PTFE. Kupoperako ndikosavuta kuyika pamwamba pa flange ndipo kumalimbana ndi dzimbiri, ndipo zotsatira zake zimakhala zabwino.

Pali mafakitale ambiri omwe kutentha kwake kuli kochepa, kuthamanga kwa mpweya sikukwera kwambiri m'malo olumikizirana amphamvu, kugwiritsa ntchito lamba wa PTFE wopangidwa ndi asbestos, womwe nthawi zambiri umaphwanyidwa ndi machubu, mapaipi. Chifukwa kupanga ndi kugwiritsa ntchito ndikosavuta, kotchuka kwambiri.