Mazut

Mazut is a heavy, low quality fuel oil, used in generating plants and similar applications. Mazut-100 is a fuel oil that is manufactured to GOST specifications, for example GOST 10585-75 (not active), GOST 10585-99 Oil fuel. Mazut. Specifications (active, last modified 07.01.2010) . (GOST is the Russian system of standards, much like ASTM, for example) which Mazut is almost exclusively produced in the Russian Federation.

This product is typically used for larger boilers in producing steam since the BTU content is high. The most important consideration (not the only consideration) when grading this fuel is the sulfur content, which can mostly be affected by the source feedstock.

For shipment purposes, this product is considered a ”dirty oil” product, and because viscosity drastically affect whether it is able to be pumped, shipping has unique requirements. Mazut is much like 6 Oil, and is part of the products left over after gasolighter components are evaporated from the crude oil.