Icyuma cyubaka:
Ikoreshwa cyane cyane mubikorwa byibyuma, ibiraro, amato nibinyabiziga.
Ikirere cy'icyuma:
Kwiyongera kubintu bidasanzwe (P, Cu, C, nibindi) bifite imbaraga zo kurwanya ruswa no kurwanya ruswa yo mu kirere, kandi bikoreshwa mugukora ibikoresho, ibinyabiziga bidasanzwe, ndetse no mubwubatsi.
Isahani ishyushye isahani idasanzwe:
Ibyuma bya karubone, ibyuma bivanga ibyuma nibikoresho byububiko rusange bikoreshwa mugukora ibice bitandukanye byubukanishi nyuma yubuhanga bwo gutunganya ubushyuhe.