Polytetrafluoroethylene(Teflon cyangwa PTFE), izwi cyane nka "umwami wa pulasitiki", ni polymer ikozwe muri tetrafluoroethylene binyuze muri polymerization, ifite ubushobozi bwo kudahinduka mu binyabutabire, irwanya ingese, ifunga, irinda amavuta menshi, irinda amashanyarazi kandi irwanya gusaza neza.

PTFE yoroshye gutembera mu buryo bukonje kandi ikananyerera iyo irimo igitutu n'ubushyuhe bwinshi, bityo ikoreshwa muri rusange ku gitutu gito, ubushyuhe buri hagati, ingese ikomeye kandi ntiyemerera umwanda w'ikirere, nka aside ikomeye, alkali, halogen, imiti n'ibindi. Ubushyuhe bw'imikorere bwizewe ni 150℃ kandi igitutu kiri munsi ya 1MPa. Ingufu za PTFE zuzuye ziyongera, ariko ubushyuhe bwo gukoreshwa ntibushobora kurenza 200℃, bitabaye ibyo ikirwanya ingese kizagabanuka. Igitutu ntarengwa cyo gukoresha PTFE muri rusange ntikirenza 2MPa.

Bitewe n’ubwiyongere bw’ubushyuhe, ibikoresho bizagenda bihindagurika, bigatuma umuvuduko w’agapfunyika ugabanuka cyane. Nubwo ubushyuhe bwaba bukwiriye, uko igihe kigenda cyongerwa, umuvuduko wo gukanda ku buso bwo gufunga uzagabanuka, bigatera "ikimenyetso cyo kuruhuka ku stress". Iki kintu kizaba mu bwoko bwose bwa gaskets, ariko kuruhuka ku stress ya PTFE pad ni ikibazo gikomeye, kandi gikwiye kuba maso.

Igipimo cyo gukururana cya PTFE ni gito (umuvuduko wo gukanda urenze 4MPa, igipimo cyo gukururana ni 0.035 ~ 0.04), kandi gasket yoroshye kuyisohokamo iyo uyifashe mbere, bityo ni byiza gukoresha ubuso bw'urukiramende rugufi n'ururenda. Iyo hakoreshejwe urukiramende rurerure, umurambararo w'inyuma wa gasket ushobora gukorwaho n'umugozi kugira ngo gasket idatembera hanze.

Kubera ko ibikoresho byo mu kirahuri bishyirwa mu mazi nyuma yo gutera urwego rwa enamel ku buso bw'icyuma, urwego rwa glaze rurakomera cyane, hamwe no gutera glaze ku buryo butangana, ubuso bwa flange ntibungana neza. Gasket y'icyuma ivanze yoroshye kwangiza urwego rwa glaze, bityo ni byiza gukoresha ibikoresho by'ibanze byakozwe mu kibaho cya asbestos na PTFE ya rubber. Gupakira biroroshye guhuza n'ubuso bwa flange kandi birwanya ingese, kandi ingaruka zo kuyikoresha ni nziza.

Hari inganda nyinshi mu bushyuhe, umuvuduko w'amazi ntuba uri hejuru mu buryo bukomeye bwangiza, hakoreshwa umukandara wa PTFE w'ibikoresho fatizo bya asbestos, ku miyoboro ikunze kwangirika, imiyoboro. Kubera ko umusaruro n'ikoreshwa byoroshye cyane, birakunzwe cyane.