polytetrafluoroethylene

noun

poly·​tet·​ra·​flu·​or·​o·​eth·​yl·​ene ˌpäl-i-ˌte-trə-ˌflu̇(-ə)r-ō-ˈeth-ə-ˌlēn 

: a polymer of tetrafluoroethylene (CF₂−CF₂)_n that is a resin with good resistance to chemicals and heat and that is used to fabricate prostheses

—abbreviation PTFE see teflon