Mmanụ mmanụ Calcined (PET Coke)bụ ngwaahịa mmanụ ala coke nke agbazere na oke okpomọkụ. A na-eji ya n'ichepụta graphite, ụlọ ọrụ na-agbaze, ụlọ ọrụ kemịkalụ, na ụlọ ọrụ ihe na-ese okwu.

N'ime ihe esemokwu, Calcined petroleum coke (PET Coke)na-arụ ọrụ dị mkpa. Ebe ọ bụ na PET coke nwere njiri mara ike siri ike na oke porosity, ọ na-arụkarị ọrụ nke ibelata ike ngwaahịa, ibelata mkpọtụ braking na ibelata ire ọkụ nke ihe mgbakasị ahụ na oke okpomọkụ na ihe braking.

Anyị nwere ike ịnye ngwaahịa ọkwa dị iche iche, na-enwekwa obi ụtọ ịnye ndị ahịa anyị dị ukwuu si n'akụkụ ụwa niile ngwaahịa ahaziri iche.