Ihe niile kpuchiri ekpuchi bụ ihe kwụsiri ike na hydrolytically ma dakọtara na mmiri niile emecha nke ọma, gụnyere gas na-enwe nrụgide.Nhọrọ ihe a na-adabere na njirisi dị iche iche, gụnyere okpomọkụ nke ala, ike siri ike, ike nkwụsị na ike ịdọka mmiri, ntinye mmiri na gas permeability, oxidation, na abrasion na chemical resistance.