NOMEX® thiab KEVLAR® yog cov polyamides aromatic lossis aramids uas DuPont tsim. Lo lus aramid yog los ntawm lo lus aromatic thiab amide (aromatic + amide), uas yog ib qho polymer uas muaj ntau cov amide bonds rov ua dua hauv cov saw polymer. Yog li ntawd, nws tau muab faib ua pawg polyamide.
Nws muaj tsawg kawg yog 85% ntawm nws cov amide bonds txuas nrog cov nplhaib aromatic. Muaj ob hom aramids tseem ceeb, faib ua meta-aramid, thiab para-aramid thiab txhua pawg ntawm ob pawg no muaj cov khoom sib txawv ntsig txog lawv cov qauv.