Ko NOMEX® me KEVLAR® he polyamide kakara, he aramid rānei i whakawhanakehia e DuPont. Ko te kupu aramid i ahu mai i te kupu aromatic me te amide (aromatic + amide), he polymer he maha ngā hononga amide e tāruarua ana i roto i te mekameka polymer. Nō reira, kua whakarōpūtia ki roto i te rōpū polyamide.
E 85% pea o ōna here amide e piri ana ki ngā mowhiti kakara. E rua ngā momo matua o ngā aramid, e whakarōpūtia ana ko te meta-aramid, me te para-aramid, ā, he rerekē ngā āhuatanga o ia rōpū e rua e pā ana ki ō rātou hanganga.