Aijiren na-enye otu n'ime nhọrọ kacha ukwuu nke okpu, mmechi, na mkpuchi dị. Họrọ n'ụdị dị iche iche nke metal na phenolic, na polypropylene plastic bottle caps, vial lids, na ndị ọzọ mmechi na usoro nke lining n'usoro dabara ngwa gị na akpa. Anyị na-egosipụtakwa okpu nkesa, okpu oghere, septa, okpu tube na okpu vial.