Mazut M100 (Heavy Fuel Oil Mazut M100 GOST 10585-75 & 10585-99)

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 Number 6 Oil, and is part of the products left over after gasoline and lighter components are evaporated from the crude oil.

The main difference between the different types of Mazut-100 is the content of sulphur. The grades are represented by these sulfuric levels:

”Very Low Sulphur” is mazut with a sulphur content of 0.5%
”Low Sulphur” is a mazut with a sulphur content of 0.5-1.0%
”Normal Sulphur” is a mazut with a sulphur content of 1.0-2.0%
”High Sulphur” is a mazut with a sulphur content of 2.0-3.5%
Very Low Sulfur mazut is generally made from the lowest sulfur crude feedstocks.

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