Yog lawm, PTFE (polytetrafluoroethylene) daim kab xev thiab Teflon daim kab xev yog qhov tseem ceeb tib yam. "Teflon" yog lub npe nrov rau ib hom PTFE, thiab nws tau dhau los ua kev lees paub dav dav raws li lub ntsiab lus rau PTFE hauv ntau lub ntsiab lus. Teflon yog ib lub npe lag luam ntawm Chemours, ib lub tuam txhab uas yog ib lub koom haum ntawm DuPont. Chemours tau tsim raws li kev sib tw los ntawm DuPont's Performance Chemicals lag luam, thiab nws tseem tsim ntau yam khoom siv PTFE, suav nrog Teflon.
Nyob rau hauv cov ntaub ntawv ntawm PTFE daim kab xev siv rau sealing threaded kev twb kev txuas, lo lus "Teflon daim kab xev" feem ntau yog siv los xa mus rau PTFE daim kab xev uas yog qhwv ib ncig ntawm threads los tsim ib lub foob. Cov kab xev no feem ntau yog xim dawb thiab muaj cov nplaum, tsis yog lo lo ntxhuav zoo nkauj ntawm PTFE cov ntaub ntawv.
Yog li, thaum tib neeg tham txog kev siv Teflon daim kab xev rau kev sib khi xov sib txuas, lawv feem ntau yog xa mus rau PTFE daim kab xev. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum Teflon yog lub npe nrov, muaj lwm cov tuam txhab tsim cov PTFE tapes zoo sib xws hauv cov npe sib txawv. Txawm hais tias lub npe tshwj xeeb, lub hom phiaj tseem ceeb ntawm daim kab xev yog muab cov xov foob rau ntau yam kev siv.