He paʻa keʻokeʻo keʻokeʻo e like me ka ʻōpala butyl me ka mānoanoa o 0.92g\/cm3. He mea ʻala ʻole, hiki ʻole ke hoʻoheheʻe ʻia i ka wai, a hiki ke hoʻoheheʻe ʻia i ka hexane a me ka chloroform. He haʻahaʻa ka ea permeability ka huahana, ka airtightness maikaʻi, a me ke kūpaʻa maikaʻi. ʻO ke kūpaʻa ozone, ke kūpaʻa kemika, ka insulation uila, ke kūpaʻa maʻalahi, ka pale ʻana i ka wela wela, ka hoʻoheheʻe ʻana i ka ikehu a me nā ʻano ʻē aʻe.