Onye na-emepụta mmanụ ala coke (GPC).
A na-eji graphite petroleum coke eme ihe n'ọtụtụ ebe dị ka ihe na-eme ka carbon na-eme nchara na ụlọ ọrụ nkedo nkenke, dị ka onye na-azụ anụ na ụlọ ọrụ ebe a na-emepụta ihe, dị ka onye na-ebelata ihe na ụlọ ọrụ ọla na dịka ihe na-atụgharị. Graphite petroleum coke nwere ike ịkwalite nucleation nke graphite na ngwọta ígwè, mee ka ọnụọgụ nke ductile dị elu ma melite nhazi na ọkwa nke ígwè nkedo isi awọ. Site na nleba anya micro, graphite petroleum coke nwere njirimara ndị a: Nke mbụ, ọdịnaya ferrite nke ígwè ductile nwere ike ịba ụba nke ukwuu n'ejighị pearlite stabilizers; Nke abụọ, ọnụ ọgụgụ nke graphite V-shaped na VI nwere ike ịbawanye n'oge eji; Nke atọ, ma e jiri ya tụnyere imeziwanye ọdịdị nke ink nodular, mmụba dị ukwuu na ọnụ ọgụgụ ink nodular nwere ike ibelata iji ihe ndị na-emepụta ihe na-emepụta ihe dị oké ọnụ ahịa na-emezigharị nke ọma, na-ebute nnukwu ego ego.