Polytetrafluoroethylene(Teflon ko PTFE), wanda aka fi sani da "Sarkin filastik", wani fili ne na polymer wanda aka yi da tetrafluoroethylene ta hanyar polymerization, tare da kyakkyawan kwanciyar hankali na sinadarai, juriya na lalata, hatimi, babban lubrication rashin danko, rufin lantarki da kyakkyawan juriya na tsufa.

PTFE yana da sauƙin sanyi kuma yana rarrafe ƙarƙashin matsi da matsanancin zafin jiki, don haka ana amfani dashi gabaɗaya don ƙarancin matsa lamba, matsakaicin zafin jiki, lalata mai ƙarfi kuma kar a ba da izinin gurɓatar matsakaici, kamar ƙarfi acid, alkali, halogen, magani da sauransu. . A aminci zafin jiki aiki ne 150 ℃ da matsa lamba ne kasa 1MPa. Ƙarfin PTFE mai cika zai karu, amma yawan zafin jiki na amfani ba zai iya wuce 200 ℃ ba, in ba haka ba juriya na lalata zai ragu. Matsakaicin matsa lamba na amfani da fakitin PTFE gabaɗaya bai wuce 2MPa ba.

Saboda karuwar yawan zafin jiki, kayan za su rarrafe, wanda zai haifar da raguwa mai mahimmanci a matsa lamba. Ko da yanayin zafin jiki ya dace, tare da tsawaita lokaci, damuwa da damuwa na farfajiyar rufewa zai ragu, wanda zai haifar da "al'amarin shakatawa na damuwa". Wannan al'amari zai faru a kowane irin gaskets, amma damuwa shakatawa na PTFE pad ya fi tsanani, kuma ya kamata a yi taka tsantsan.

A gogayya coefficient na PTFE ne kananan (danniya matsa lamba ne mafi girma fiye da 4MPa, da gogayya coefficient ne 0.035 ~ 0.04), da gasket ne sauki zamewa waje a lokacin da pre-tightening, don haka shi ne mafi kyau a yi amfani da concave da convex flange surface. Idan an yi amfani da flange mai lebur, ana iya tuntuɓar diamita na waje na gasket tare da kullin don hana gasket daga zamewa a waje.

Saboda kayan aikin gilashin da aka yi amfani da su bayan an fesa wani Layer na enamel akan saman karfe, glaze Layer yana da rauni sosai, haɗe tare da fesa mara kyau da glaze Layer kwarara, shimfidar fili na flange ba shi da kyau. Gasket ɗin haɗin ƙarfe na ƙarfe yana da sauƙi don lalata glaze Layer, don haka ana ba da shawarar yin amfani da ainihin kayan da aka yi da katakon asbestos da fakitin PTFE na roba. Shirye-shiryen yana da sauƙi don dacewa da filin flange kuma yana tsayayya da lalata, kuma tasirin amfani yana da kyau.

Akwai da yawa masana'antu a cikin zafin jiki, matsa lamba ne ba high a cikin karfi m matsakaici, da yin amfani da asbestos roba farantin nade PTFE albarkatun kasa bel, domin sau da yawa disassembled manholes, bututu. Domin samarwa da amfani sun dace sosai, shahararru.