Mazut is a heavy, low quality fuel oil, used in generating plants
and similar applications. In the United States and Western Europe,
mazut is blended or broken down, with the end product being
Mazut may be used for heating houses in the former USSR and in
countries of the Far East that do not have the facilities to blend
or break it down into more conventional petro-chemicals. In the
West, furnaces that burn mazut are commonly called "waste oil"
heaters or "waste oil" furnaces.
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). Mazut is almost exclusively manufactured in the
Russian Federation, Kazakhstan, Azerbaijan, and Turkmenistan. This
product is typically used for larger boilers in producing steam
since the energy value is high. The most important factor 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 Number 6 Oil (Bunker C),
and is part of the products left over after gasoline and lighter
components are evaporated from the crude oil.