Polytetrafluoroethylene(Teflon kana PTFE), inozivikanwa se "plastic king", ipolymer compound yakagadzirwa ne tetrafluoroethylene ne polymerization, ine kugadzikana kwakanaka kwemakemikari, inodzivirira ngura, inovhara, haina kusviba zvakanyanya, inodzivirira magetsi uye inogara kwenguva refu ichirwisa kukwegura.

PTFE iri nyore kutonhora uye inoyerera kana yamanikidzwa uye tembiricha yakakwira, saka inowanzo shandiswa pakuderedza kumanikidzwa, tembiricha yepakati, ngura yakasimba uye haibvumiri kusvibiswa kwechinhu, senge acid yakasimba, alkali, halogen, mushonga nezvimwewo. Tembiricha yekushanda yakachengeteka i150℃ uye kumanikidzwa kuri pasi pe1MPa. Simba rePTFE rakazadzwa richawedzera, asi tembiricha yekushandisa haigone kudarika 200℃, zvikasadaro kuramba kukanganiswa kwengura kuchaderera. Kumanikidzwa kwakanyanya kwePTFE packing kazhinji hakupfuuri 2MPa.

Nekuda kwekuwedzera kwekupisa, zvinhu zvinokambaira, zvichikonzera kudzikira kukuru kwekumanikidzwa kwechisimbiso. Kunyangwe kana tembiricha yakakodzera, nekuwedzera kwenguva, kumanikidzwa kwekumanikidzwa kwenzvimbo yekuvharira kuchaderera, zvichikonzera "kudzikamisa kushushikana". Chiitiko ichi chichaitika mumhando dzese dzemagasket, asi kudzikamisa kushushikana kwePTFE pad kwakanyanya, uye kunofanira kungwarira.

Kukweshana kwePTFE kudiki (kumanikidzwa kwakanyanya kupfuura 4MPa, kukweshana kwe friction i0.035~0.04), uye gasket iri nyore kutsvedza kunze kana yasimbiswa, saka zvakanaka kushandisa pamusoro pe concave ne convex flange. Kana flat flange ikashandiswa, dhayamita yekunze yegasket inogona kubatwa nebhaudhi kudzivirira gasket kuti isatsvedzere kunze.

Nekuti michina yegirazi inonyungudika mushure mekupfapfaidza jira re enamel pamusoro pesimbi, jira re glaze harina kunyatsosimba, pamwe chete nekupfapfaidza kusina kuenzana uye kuyerera kwejira re glaze, flange haina kusimba. Gasket yesimbi ine composite gasket iri nyore kukuvadza jira re glaze, saka zvinokurudzirwa kushandisa zvinhu zvepakati zvakagadzirwa ne asbestos board uye rabha PTFE packing. Kupakira kuri nyore kuenderana ne flange pamusoro uye kunodzivirira ngura, uye mhedzisiro yekushandisa yakanaka.

Kune mafekitori akawanda ari mukupisa, kumanikidzwa hakusi kwakakwira mumhepo ine simba inoparadza, kushandiswa kwebhandi rePTFE rabha rakafukidzwa neasbestos rabha, mapombi anowanzo patsanurwa. Nekuti kugadzirwa nekushandiswa zviri nyore, zvakakurumbira.