Bitumen

Bitumen is a sticky, viscous residue produced as a byproduct of Petroleum production. In Oxygen Not Included it is presented simply as the thick, adhesive material that remains after petroleum is refined or otherwise processed. The term appears across multiple localizations of the game with equivalent definitions: in Spanish as Betún, in Portuguese as Betume, in French as bitume, in German as Bitumen, in Italian as bitume, in Russian as Битум, in Polish as Bitum, in Chinese as 沥青, in Japanese as 瀝青, and in Korean as 역청. All sources describe the substance in the same terms: a viscous, sticky residue resulting from petroleum production.

Bitumen does not have additional properties or uses described in the available documentation beyond its identity as the residual product of petroleum processing. It is characterized by its adhesiveness and viscosity, consistent with routine definitions of bituminous residues in industrial contexts.

• Bitumen is produced as a leftover from Petroleum production; it is not an independent primary ore or crop.
• The material is described uniformly across multiple language sources in the game’s documentation, indicating a single in-game role as the petroleum residue.
• No further game mechanics, processing pathways, or alternate uses for Bitumen are detailed in the provided sources.