NOMEX® ndi KEVLAR® ndi ma polyamides onunkhira kapena ma aramidi opangidwa ndi DuPont.Mawu akuti aramid amachokera ku mawu onunkhira ndi amide (onunkhira + amide), omwe ndi polima okhala ndi zomangira zambiri za amide zomwe zimabwerezedwa mu unyolo wa polima.Chifukwa chake, amagawidwa m'gulu la polyamide.
Ili ndi 85% ya zomangira zake za amide zomwe zimamangidwa ndi mphete zonunkhira.Pali mitundu iwiri ikuluikulu ya ma aramid, omwe ali m'gulu la meta-aramid, ndi para-aramid ndipo gulu lililonse lamagulu awiriwa lili ndi katundu wosiyana wokhudzana ndi mapangidwe awo.