Wahi a ka papa hana metala, ʻoi aku ka haʻahaʻa o ka waiwai ikaika o ke keleawe keleawe, no laila ʻoi aku ka maikaʻi o ke kūpaʻa corrosion ma mua o nā metala ʻē aʻe.He kūpaʻa ka waiwai kemika o ke keleawe ʻulaʻula, hoʻohui i ke kū anuanu, ke kūpaʻa wela, ke kūpaʻa ʻana, ka pale ʻana i ka corrosion a me ke kūpaʻa ahi (ʻo ke kiʻekiʻe o ke keleawe he 1083 degere Celsius).No laila, ʻoi aku ka lōʻihi o ka plug keleawe ʻulaʻula kiʻekiʻe o kēia manawa a hiki ke hoʻohana ʻia i nā wahi like ʻole no ka manawa lōʻihi.