Fuel oil is a type of refined oil. It is one of the heavier residual products from the refining of crude oil, after lighter components such as gasoline, kerosene, and diesel are first separated. Primarily the residue from the cracking and straight-run distillation of crude oil, fuel oil is characterized by its high viscosity as well as the significant amount of non-hydrocarbon compounds, resins, and asphaltenes. Fuel oil is principally used in oil refining and chemical, transport, construction, and metallurgy industries. In recent years, the consumption of fuel oil by boilers and power generation has dropped sharply, whereas the demand in the marine fuel market is rising steadily.

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