I-Polytetrafluoroethylene(I-Teflon noma i-PTFE), eyaziwa kakhulu ngokuthi “inkosi yepulasitiki”, iyinhlanganisela ye-polymer eyenziwe nge-tetrafluoroethylene nge-polymerization, enokuqina okuhle kwamakhemikhali, ukumelana nokugqwala, ukuvala, ukungagqwali okuphezulu, ukuvikela kagesi kanye nokukhuthazela okuhle kokulwa nokuguga.

I-PTFE kulula ukuyipholisa futhi inyakaze ngaphansi kwengcindezi kanye nokushisa okuphezulu, ngakho-ke ivame ukusetshenziselwa ukucindezela okuphansi, izinga lokushisa eliphakathi, ukugqwala okunamandla futhi ayivumeli ukungcoliswa kwendawo, njenge-asidi enamandla, i-alkali, i-halogen, imithi njalo njalo. Izinga lokushisa lokusebenza eliphephile lingu-150℃ futhi ingcindezi ingaphansi kwe-1MPa. Amandla e-PTFE agcwele azokwanda, kodwa izinga lokushisa lokusebenzisa alikwazi ukudlula ku-200℃, ngaphandle kwalokho ukumelana nokugqwala kuzoncipha. Ingcindezi ephezulu yokusetshenziswa kokupakisha kwe-PTFE ngokuvamile ayidluli ku-2MPa.

Ngenxa yokwenyuka kwezinga lokushisa, izinto zizokhukhuleka, okuholela ekwehleni okukhulu kwengcindezi yesivalo. Ngisho noma izinga lokushisa lifanele, ngokuhamba kwesikhathi, ukucindezeleka kokucindezela kwendawo yokuvala kuzoncipha, okuholela "esimweni sokuphumula kokucindezeleka". Lesi simo sizokwenzeka kuzo zonke izinhlobo zama-gasket, kodwa ukukhululeka kokucindezeleka kwephedi ye-PTFE kubi kakhulu, futhi kufanele uqaphele.

I-coefficient yokungqubuzana ye-PTFE incane (ukucindezeleka kokucindezela kukhulu kune-4MPa, i-coefficient yokungqubuzana ingu-0.035~0.04), futhi i-gasket kulula ukuyikhipha ngaphandle uma uyiqinisa kusengaphambili, ngakho-ke kungcono ukusebenzisa ubuso be-flange obugobile nobugobile. Uma kusetshenziswa i-flange eyisicaba, ububanzi bangaphandle be-gasket bungaxhunywa ne-bolt ukuvimbela i-gasket ukuthi ingasheleli ngaphandle.

Ngenxa yokuthi imishini yokufakwa kwengilazi ishiswa ngemva kokufutha ungqimba lwe-enamel ebusweni bensimbi, ungqimba lwe-glaze lubuthakathaka kakhulu, luhambisana nokufutha okungalingani kanye nokugeleza kongqimba lwe-glaze, ukuthamba kobuso be-flange akukuhle. I-gasket yensimbi ehlanganisiwe kulula ukuyonakalisa ungqimba lwe-glaze, ngakho-ke kunconywa ukusebenzisa izinto eziyinhloko ezenziwe ngebhodi le-asbestos kanye nokupakisha kwe-PTFE yerabha. Ukupakisha kulula ukuhambisana nobuso be-flange futhi kumelana nokugqwala, futhi umphumela wokusetshenziswa muhle.

Kunezimboni eziningi ezisezingeni lokushisa, ingcindezi ayiphezulu endaweni eqinile egqwalisayo, ukusetshenziswa kwe-asbestos raber plate wraped PTFE raw material belt, amapayipi avame ukuhlakazwa. Ngoba ukukhiqizwa nokusetshenziswa kulula kakhulu, kuthandwa kakhulu.