Mazut is a heavy, low-grade fuel oil produced as a residue from the distillation of lighter petroleum fractions such as gasoline, ligroin, kerosene, and diesel. It encompasses all residual fuel oils, including those formed through blending processes. Known for its dense and viscous nature, Mazut typically has a kinematic viscosity above 10 cSt at 80°C, a flash point exceeding 50°C, and a density greater than 0.90 kg/l. Due to its high energy content and cost-effectiveness, it is widely used in power plants, industrial boilers, and large-scale heating systems, particularly in regions with established heavy fuel infrastructure.