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Xov foob daim kab xev (tseem hu ua PTFE daim kab xev los yog cov kav dej cov kab xev) yog polytetrafluoroethylene (PTFE) zaj duab xis siv rau hauv sealing yeeb nkab threads.Cov kab xev yog muag txiav rau qhov dav dav thiab qhov txhab ntawm ib lub spool, ua rau nws yooj yim rau cua ncig cov yeeb nkab threads.Nws kuj tseem paub los ntawm kev lag luam genericised-lub npe Tef ...Nyeem ntxiv»