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E whakamahia ana ngā irahiko karāpiti mō ngā oumu pewa hiko, ngā oumu koko me ngā oumu pewa ruku. I muri i te whakakahangia i roto i te hanga maitai EAF, hei kaiārahi pai, ka whakamahia hei whakaputa pewa, ā, ka whakamahia te wera o te pewa hei whakarewa me te whakapai ake i te maitai, ngā konganuku kore-ferrous me ō rātou koranu. He kaiārahi au pai i roto i te oumu pewa hiko, kāore e rewa, e memeha rānei i ngā pāmahana teitei, ā, ka mau tonu te kaha miihini motuhake. E toru ngā momo:RPHP, meIrahiko karāhe UHP.