I-Polytetrafluoroethylene(I-Teflon noma i-PTFE), evame ukubizwa ngokuthi “inkosi yepulasitiki”, iyinhlanganisela ye-polymer eyenziwe nge-tetrafluoroethylene nge-polymerization, enokuqina okuhle kakhulu kwamakhemikhali, ukumelana nokugqwala, ukubekwa uphawu, ukugcotshwa okuphezulu okungeyona i-viscosity, ukufakwa kukagesi nokukhuthazela okuhle kokuguga.

I-PTFE kulula ukugeleza okubandayo futhi ingene ngaphansi kwengcindezi kanye nokushisa okuphezulu, ngakho-ke isetshenziselwa ukucindezela okuphansi, izinga lokushisa eliphakathi, ukugqwala okuqinile futhi ungavumeli ukungcoliswa kwe-medium, njenge-asidi eqinile, i-alkali, i-halogen, imithi nokunye. . Izinga lokushisa eliphephile lokusebenza ngu-150 ℃ futhi ingcindezi ingaphansi kwe-1MPa. Amandla e-PTFE agcwalisiwe azokhula, kodwa izinga lokushisa lokusetshenziswa alikwazi ukudlula u-200℃, ngaphandle kwalokho ukumelana nokugqwala kuzokwehla. Ingcindezi yokusetshenziswa ephezulu yokupakishwa kwe-PTFE ngokuvamile ayibi ngaphezu kuka-2MPa.

Ngenxa yokwanda kwezinga lokushisa, izinto zizokhasa, okuholela ekwehleni okukhulu kwengcindezi yophawu. Ngisho noma izinga lokushisa lifanelekile, ngokunwetshwa kwesikhathi, ukucindezeleka kokucindezela kwendawo yokubeka uphawu kuzokwehla, okuholela "ekuphumuleni kokucindezeleka okwenzekayo". Lesi simo sizokwenzeka kuzo zonke izinhlobo zama-gaskets, kodwa ukuphumula kokucindezeleka kwe-PTFE pad kubi kakhulu, futhi kufanele kuqaphe.

I-coefficient yokushayisana ye-PTFE incane (ingcindezi yokuminyanisa inkulu kune-4MPa, i-coefficient ye-friction ingu-0.035~0.04), futhi i-gasket kulula ukushelela iphumele ngaphandle uma iqina ngaphambili, ngakho-ke kungcono kakhulu ukusebenzisa indawo ye-concave ne-convex flange. Uma i-flange eyisicaba isetshenziswa, ububanzi obungaphandle be-gasket bungathintana nebhawudi ukuvimbela i-gasket ukuthi ingasheleli ngaphandle.

Ngenxa yokuthi ulwelwesi lwengilazi luyashiswa ngemva kokufafaza ungqimba loqweqwe loqweqwe lwensimbi endaweni yensimbi, ungqimba olucwebezelayo lushwabene kakhulu, luhambisana nokufafaza okungalingani kanye nokugeleza kongqimba olucwebezelayo, ukuvuleka kwendawo ye-flange kubi. I-gasket eyinhlanganisela yensimbi kulula ukulimaza ungqimba olucwebezelayo, ngakho-ke kunconywa ukusebenzisa izinto eziwumgogodla ezenziwe ngebhodi le-asbestos kanye nokupakishwa kwenjoloba ye-PTFE. Ukupakisha kulula ukungena endaweni ye-flange futhi imelana nokugqwala, futhi umphumela wokusetshenziswa muhle.

Kunamafekthri amaningi kumazinga okushisa, ingcindezi ayiphezulu endaweni eqinile edlayo, ukusetshenziswa kwepuleti yenjoloba ye-asbestos eboshwe ngebhande le-PTFE lempahla eluhlaza, imigodi evame ukuhlakazwa, amapayipi. Ngoba ukukhiqizwa nokusetshenziswa kulula kakhulu, kuthandwa kakhulu.