Hejuru - chromium alloy yambara layer- irwanya kwihanganira ni igikoresho cyihariye cyo gukingira, gikunze gukoreshwa nkimbere yimbere yimyenda ibiri - yambara ibyuma -. Yakozwe kuva hejuru - ibikoresho bya chromium bivanze binyuze muburyo bugereranije no gutunganya, kandi birashobora gutanga uburinzi bwiza mubushyuhe bwo hejuru - hamwe nibidukikije bikabije. Mu nganda zikoreshwa mu nganda, imiyoboro ikunze guhura nibibazo bitandukanye bitewe no kwambara cyane, kandi hejuru ya - chromium alloy yambara - irwanya irashobora kurinda neza imiyoboro, ikongerera igihe cyakazi, kandi igabanya amafaranga yo kubungabunga.
