O le ipu apamemea o se ituaiga o apamemea taʻitaʻi faʻaaoga lautele, e iai mea faʻainisinia lelei, ma machinability lelei, e mafai ona tatalia le vevela ma le malulu o le gaosiga o le mamafa, faʻaaogaina i le tipiina ma le faʻailogaina o le faʻaogaina o vaega faʻavae eseese, e pei o gaskets, bushings, etc. Tin apamemea ipu. o loʻo i ai le maualuga o le corrosion resistance, mea lelei faʻainisinia, lelei le gaosiga o le mamafa i le malulu ma le vevela, e mafai ona faʻaaogaina mo vaega faʻafefete i luga o vaʻa ma vaʻa, suauu ma isi vaega faʻafesoʻotaʻi faʻasalalauga ma alalaupapa.