Bitumen is a substance that may be obtained with natural precipitation of crude oil and fractional distillation of petroleum in oil refineries, and found in solid, semi-solid or liquid forms with its color with hydrocarbon compound varying between deep brown and black. In sum, it is the portion remaining in the bottom of crude oil.

Base oils are the products obtained with distillation of crude oil atmospherically by subjecting heavy products to process again or chemical synthesis and used in production of lube oil or industrial oil. There are two types of base oils as mineral and synthetic base oils based on the method of obtaining.