Mkpa ígwè a na-eji ígwè agbagharị agbagharị dị mfe iji rụọ ọrụ, ejiri ígwè alloy dị elu mee mkpa ahụ, isi mkpa ahụ nwere nhazi ihe dị omimi, ata siri ike, yana mkpuchi mkpọchi, na-egbochi ịmịpụ. Enwere ike ịkpụ ya n'efu iji dozie camber ahụ, ojiji n'akụkụ dị iche iche. Aka mkpuchi ahụ na-eji resin epoxy siri ike na tube e ji ụfụfụ kpuchie, nke nwere ike dị elu, arụmọrụ mkpuchi dị mma, mbepụ ahụ dị nro ma ghara inwe burrs.
Rịba ama: Mgbe ị na-eji ya ma ọ bụrụ na ejiri ya ọkụ, yi uwe aka roba nke e ji ihe kpuchie, nọrọ ebe dị anya ma soro iwu nchekwa niile.