Graphite peteroli ya kokiya (GPC), nkizamura karubone, nikintu cyingenzi mubikorwa byo gukora ibyuma.Ikoreshwa cyane cyane nka karuboni yongeweho mugihe cyo gukora ibyuma kugirango yongere karubone, igabanye umwanda, kandi izamure ubwiza bwibyuma.
Ibikomoka kuri peteroli bibarwa (CPC) nigicuruzwa gikomoka ku bushyuhe bwo hejuru bwa karuboni ya peteroli ya kokiya, kikaba ari umusaruro ukomoka mu gutunganya amavuta ya peteroli. CPC ikoreshwa cyane mu nganda za aluminium n’ibyuma, ikoreshwa no mu gukora dioxyde de titanium.