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a blackish solid product consisting essentially of carbon, mostly obtained by thermal cracking, nearly pure carbon formed during the refining of crude oil by high temperature carbonization of the heavy residues
petrolikoksi . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/petrolikoksi/1/fin (20.06.2026)
