M100, or MAZUT is a heavy, low quality fuel oil, used in generating plants and similar applications. Usually mazut is blended or broken down, with the end product being diesel. Mazut may be used for heating houses in countries that do not have the facilities to blend or break it down into more conventional Petro-chemicals. Furnaces that burn mazut are commonly called “waste oil” heaters or “waste oil” furnaces.
The most important factor when grading this fuel is the Sulphur content, which can mostly be affected by the source feedstock. The grades are represented by Very Low (0.5%) to High (>2.0%) Sulphur levels. For shipment purposes, this product is considered a” dirty oil” product, and its viscosity drastically affects whether it is able to be pumped and shipping this has unique requirements, especially in low temperature environments. Mazut is much like Number 6 Oil (Bunker C) and is part of the products left over after gasoline and lighter components are evaporated from the crude oil.