Coke batroolka garaafaysan waa in loo beddelo kookaha batroolka kaarboon kaarboon oo lakab leh oo heerkul sarreeya oo qiyaastii 3000 digrii ah, taas oo ah, kookaha batroolka ayaa noqda graphite. Habkan waxa loo yaqaan garaafaynta. Coke batroolka ee lagu farsameeyo habka garaafaynta waxa loo yaqaan kookaha batroolka graphitized.
