Hana ʻia ka ʻupena iʻa paʻa i ke kaula polyethylene kiʻekiʻe e like me ka mea maka a he kūpaʻa maikaʻi ka corrosion.Hoʻololi a haki i ka mahana o ka emi o 30° a 50°.ʻAʻole emi ke ola lawelawe ma mua o 5 mau makahiki.Ua ulana pū ʻia me kahi milo nylon ʻaʻala a lahilahi, a ua nakinaki ʻia me nā mea kaupaona kepau a me nā lana.ʻAʻole hiki ke ʻike ʻia i ka wai, he palupalu maikaʻi a paʻakikī, he kiʻekiʻe ka tensile a me ka ikaika compressive, ʻaʻole maʻalahi e haki, a maikaʻi ka lōʻihi.Abrasive, lōʻihi lawelawe ola, ʻoi aku ka lōʻihi.