Cov khoom uas tsis yog- nplaum ntawm cov khoom tsis yog- cov lauj kaub kib yog los ntawm cov khoom siv txheej txheej ntawm lawv sab hauv, xws li polytetrafluoroethylene (Teflon). Nws tsis tshua muaj coefficient ntawm kev sib txhuam thiab qhov ntom ntom ntom ntom ua rau nws nyuaj rau cov khoom noj los lo.
PTFE yog chemically ruaj khov thiab tseem ruaj khov hauv qab 260 degree. Qhov kub ua noj txhua hnub feem ntau nyob ib puag ncig 200 degree, qis dua qhov txwv no.
Tshaj 260 degree, cov txheej yuav tsis ruaj khov, thiab siab dua 350 degree, nws tuaj yeem decompose, tsim cov khoom tsis zoo xws li hydrogen fluoride thiab carbonyl fluoride, thiab muaj peev xwm ua rau "polymer fumes fever."
Cov txheej txheem thaum ntxov siv perfluorooctanoic acid (PFOA), uas ua rau muaj kev pheej hmoo. Txawm li cas los xij, cov txheej txheem niaj hnub tau txhim kho, thiab txheej txheej tev lossis hnav feem ntau cuam tshuam rau kev ua haujlwm tsis yog - nplaum. Kev noj cov khoom me me ntawm cov txheej txheej yog yooj yim tawm los ntawm lub cev thiab muaj kev cuam tshuam rau kev noj qab haus huv tsawg.