What is equivalent of M100 Fuel Oil in Refinary form?

M100 fuel oil, often referred to as marine fuel oil or heavy fuel oil, is equivalent to a refinery's heavy residual fuel oil or bunker fuel. It is derived from the distillation process of crude oil and consists of a high viscosity and density, making it suitable for marine and industrial applications. In refinery terms, it typically comes from the bottom of the distillation column after lighter fractions have been removed.