Imiterere yububiko bwa galvalume ibyuma ni Zn-Al alloy, naho ibifuniko ni 55% Al, 43.3% Zn, na 1,6% Si.Kuberako irwanya ruswa nziza, ubu bwoko bwibyuma bikoreshwa kwisi yose.
Iterambere ryibyuma bya aluzinc.Kubijyanye no gutanga no gukenera, nyuma yimyaka yo guhindura no guhatanira isoko, inganda za galvalume zo mu Bushinwa zahindutse buhoro buhoro.Isoko ryo gutanga isoko nibisabwa biringaniye.Igipimo cyo kugurisha no kugurisha kiri hejuru ya 90% buri mwaka, kandi ibicuruzwa byinshi byoherezwa hanze buri mwaka.