ʻO ka papa pahu pahu XPS, i kapa ʻia ʻo ka polystyrene extrusion plastic board (XPS no ka pōkole) he kīnā ʻole i pani ʻia-pore alveolate. ʻO kāna mau hana e like me ka density, ka wai absorption, coefficient of heat conducting a me ka coefficient of steam pervasion a pēlā aku e ʻoi aku ka maikaʻi ma mua o nā papa ʻē aʻe i nā mea mālama wela a loaʻa iā lākou nā hiʻohiʻona o ka ikaika ikaika, nā mea māmā, ke ea, anticorrosion, ke kū'ē kahiko, ke kumu kūʻai haʻahaʻa, a me nā mea'ē aʻe. Ua hoʻohana nuiʻia ia ma nāʻano o ka mālamaʻana i ka wela a me ka hoʻouluʻana i ka wela ma kaʻoihana hana, ka hau kū'ē o ke alaloa, ke kaʻaahi, ke kahua mokulele, ka square a me ka pono o ka hale. ʻAe ʻia a ʻo ia ka mea mālama wela maikaʻi loa ma ka mākeke i kēia manawa.