Nk’uko byatangajwe na komisiyo mpuzamahanga y’ubucuruzi muri Amerika (USITC), Minisiteri y’ubucuruzi muri Amerika…
Ibyuma bitagira umwanda nizina ryahawe ibyuma-binini cyane, bikoreshwa cyane cyane muburyo bwo kurwanya ruswa. Ikintu nyamukuru kiranga ibyuma bitagira umwanda ni uko byose birimo byibuze chromium 10.5%.
Ijanisha rya karubone mubyuma bigira ingaruka zikomeye, imbaraga za elastike no guhindagurika kwicyuma. Icyuma cyoroheje, kizwi kandi nkicyuma cyoroheje, gifite imiterere isa nicyuma, ariko cyoroshye kandi cyoroshye gukora.
Icyuma gishyushye gishyizwe hamwe gihuza ibikorwa nuburanga.Bigizwe na tin, chrome, zinc cyangwa irangi, nibindi byongeweho bikoreshwa hejuru yicyuma gisanzwe.
Aluminium hamwe ninshi mu bivangavanze birwanya cyane uburyo butandukanye bwo kwangirika.Uyu mutungo watumye aluminiyumu ikundwa cyane mu bwubatsi, ubwubatsi bwo mu nyanja n’ubwikorezi.
Imiyoboro yicyuma ni miyoboro miremire ikoreshwa muburyo butandukanye.Byakozwe nuburyo bubiri butandukanye butuma imiyoboro isudira cyangwa idafite kashe kugirango ikoreshwe ahantu hatandukanye.
Ibyuma byibyuma bifite uburyo butandukanye bwo gukoresha hamwe nuburyo butandukanye mubikorwa byinganda.Ubwoko butandukanye bwibihimbano bushobora kubamo ibyuma, bigatuma biba ibintu byinshi cyane kugirango bikorwe n’ibyuma bya karubone hamwe n’ibyuma bidafite ingese.
Inkoni y'icyuma ni ubwoko bw'ibyuma bishyushye bishyizwe mu byiciro. Birashobora kuba ibyuma bya karubone cyangwa ibicuruzwa bidafite ingese.Icyuma gikoreshwa nk'ibikoresho bifata, amasoko, imiyoboro, imigozi y'insinga hamwe na meshi.
Ibyuma bifite ibintu byinshi bitandukanye, bitewe nibindi bintu bibigize.Icyuma nikimwe mubikoresho bikoreshwa cyane mubikorwa byinganda hamwe nibyuma bikoreshwa cyane kuri iyi si.
Impuzandengo y'ibicuruzwa n'ibisabwa yarahagaze, kandi isoko ry'ibyuma mu Bushinwa ryongeye kwiyongera kuva muri Nyakanga