Aia nā mea maʻamau no nā papa kākoʻo, akā ʻaʻole i kaupalena ʻia i kēia mau mea. ʻO nā mea metala, e like me ke kila a me ka alumini, hāʻawi i ka ikaika kiʻekiʻe a me ke kūpaʻa maikaʻi loa. He ha'aha'a ke kumu kū'ai -la'au, e like me ka plywood a me ka fiberboard. ʻO nā mea palaki, e like me ka polyethylene a me ka polypropylene, maʻalahi a pale i ka ʻino-. ʻO nā mea i hoʻohui ʻia, e like me nā fiber-composite i hoʻoikaika ʻia, hoʻohui i nā pono o nā mea he nui a hāʻawi i ka hana ʻoi aku ka maikaʻi. Loaʻa nā mea kūikawā, e like me ka ceramic a me nā papa asbestos, a ʻo ke koho e pili ana i ke ʻano kikoʻī a me nā koi.
