Ana yin bututun ƙarfe mai rufi na ciki da na waje ta hanyar narke Layer na polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) foda, da polycarbonate mara guba tare da kauri na 0.5 zuwa 1.0mm. akan bangon ciki na bututun karfe.Bututun da aka haɗa da ƙarfe-roba da aka haɗa da abubuwan halitta irin su propylene (PP) ko polyvinyl chloride mara guba (PVC) ba wai kawai yana da fa'idodin ƙarfi mai ƙarfi, haɗin kai mai sauƙi, da juriya ga kwararar ruwa ba, har ma yana shawo kan lalatawar ƙarfe. bututu idan an fallasa ruwa.Lalacewa, ƙwanƙwasa, ƙarancin ƙarfin bututun filastik, ƙarancin aikin kashe gobara da sauran gazawa, rayuwar ƙirar na iya zama har zuwa shekaru 50.Babban hasara shine kada a lanƙwasa lokacin shigarwa.A lokacin sarrafa zafi da yankan walda na lantarki, ya kamata a fentin filin yankan tare da mannen zafin jiki na yau da kullun mara guba wanda masana'anta ke bayarwa don gyara sashin da ya lalace.