ʻO ka membrane he membrane, a inā makemake ʻoe e wehewehe, ʻaʻole pono ia. Eia nō naʻe, ʻo ka wehewehe ʻana o ke kiʻi ʻoniʻoni ʻo ia ka hoʻohana ʻana i nā mea polymer synthetic ma ke ʻano he kumu kumu, ua hui pū ʻia me nā mea kōkua ʻē aʻe i kekahi ʻāpana, a ua hana ʻia i loko o kahi mānoanoa (0.01-0.25mm ka mānoanoa) ma nā mīkini hoʻoheheʻe plastik. a me nā mea hana. ʻAʻole ʻokoʻa ka laulā a me ka lōʻihi. ʻO nā huahana plastik liʻiliʻi, ʻoluʻolu a palupalu me ka ʻili palahalaha.