دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: one of a group of solid. liquid, or semisolid materials that are predominantly mixtures of heavy hydrocarbons and their non-metallic derivatives and are obtained either from natural bituminous deposits or from the residues of petroleum refining.

n: a crude oil that is characterised by a low API gravity and a low yield of lubricating oils and that has a low pour point and a low viscosity index (compared to paraffin-base oils). It is often called asphalt-base oil, because the residue from its distillation contains asphaltic materials but little or no paraffin wax.