Polytetrafluoroethylene(Teflon kapena PTFE),yomwe imadziwika kuti "pulasitiki mfumu", ndi polima pawiri opangidwa ndi tetrafluoroethylene ndi polymerization, ndi bwino mankhwala bata, kukana dzimbiri, kusindikiza, mkulu kondomu sanali mamasukidwe akayendedwe, kutchinjiriza magetsi ndi zabwino odana ndi ukalamba kupirira.

PTFE n'zosavuta ozizira otaya ndi kukwawa pansi pa mavuto ndi kutentha kwambiri, choncho ambiri ntchito kwa otsika kuthamanga, sing'anga kutentha, dzimbiri wamphamvu ndipo musalole kuipitsa sing'anga, monga asidi wamphamvu, alkali, halogen, mankhwala ndi zina zotero. . Kutentha kogwira ntchito kotetezeka ndi 150 ℃ ndipo kupanikizika kuli pansi pa 1MPa. Odzazidwa PTFE mphamvu adzachuluka, koma ntchito kutentha sangathe upambana 200 ℃, apo ayi kukana dzimbiri adzachepa. Kugwiritsa ntchito kwambiri kuthamanga kwa PTFE kulongedza nthawi zambiri sikuposa 2MPa.

Chifukwa cha kuwonjezeka kwa kutentha, zinthuzo zidzakwawa, zomwe zimapangitsa kuchepa kwakukulu kwa chisindikizo. Ngakhale kutentha kuli koyenera, ndi kuwonjezereka kwa nthawi, kupanikizika kwa malo osindikizira kudzachepa, zomwe zimabweretsa "kupsinjika maganizo". Chodabwitsa ichi chidzachitika mu mitundu yonse ya gaskets, koma kumasuka kwa PTFE pad ndizovuta kwambiri, ndipo ziyenera kukhala tcheru.

Mkangano wa PTFE ndi wawung'ono (kupanikizika kwapakati ndi kwakukulu kuposa 4MPa, friction coefficient ndi 0.035 ~ 0.04), ndipo gasket ndiyosavuta kutsetsereka panja pamene ikumizidwa, choncho ndi bwino kugwiritsa ntchito concave ndi convex flange pamwamba. Ngati flange yathyathyathya imagwiritsidwa ntchito, mbali yakunja ya gasket imatha kulumikizidwa ndi bawuti kuteteza gasket kuti isadutse panja.

Chifukwa zida zopangira magalasi zimatenthedwa pambuyo popopera zitsulo pamwamba pa chitsulo, glaze wosanjikiza ndi wosasunthika kwambiri, kuphatikizapo kupopera mbewu mankhwalawa mosagwirizana ndi kutuluka kwa glaze, pamwamba pa flatness wa flange ndi osauka. The zitsulo gulu gasket n'zosavuta kuwononga glaze wosanjikiza, choncho tikulimbikitsidwa kugwiritsa ntchito pachimake zinthu zopangidwa asibesitosi bolodi ndi mphira PTFE kulongedza katundu. Kulongedzako ndikosavuta kukwanira ndi flange pamwamba komanso kugonjetsedwa ndi dzimbiri, ndipo kugwiritsa ntchito kwake ndikwabwino.

Pali mafakitale ambiri kutentha, kuthamanga si mkulu mu sing'anga amphamvu zikuwononga, ntchito asibesitosi mphira mbale wokutidwa PTFE yaiwisi lamba, nthawi zambiri disassembled manholes, mipope. Chifukwa kupanga ndi kugwiritsa ntchito ndizosavuta, zodziwika bwino.