NOMEX® ndi KEVLAR® ndi ma polyamides kapena ma aramides opangidwa ndi DuPont. Mawu akuti aramid amachokera ku mawu akuti aromatic ndi amide (aromatic + amide), omwe ndi polima yokhala ndi ma amide bond ambiri omwe amabwerezedwa mu unyolo wa polima. Chifukwa chake, imagawidwa mkati mwa gulu la polyamide.
Ili ndi pafupifupi 85% ya ma amide bond ake olumikizidwa ndi mphete za aromatic. Pali mitundu iwiri ikuluikulu ya aramid, yomwe ili m'gulu la meta-aramid, ndi para-aramid ndipo gulu lililonse mwa magulu awiriwa lili ndi makhalidwe osiyanasiyana okhudzana ndi kapangidwe kake.