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 kū'ē o ka ozone, ke kū'ē kemika, ka ho'oku'u uila, ke kū'ē i ka ma'alahi, ke kū'ē'ana i ka wela, ka lawe'ana i ka ikehu a me nā mea'ē a'e.