manufactured to 'GOST' specifications

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). 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 BTU content is high. The most important consideration (not the only consideration) when grading this fuel is the sulfr content, which can mostly be affected by the source feedstock.

Shipping Information

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.

Sulphur Content

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%


Fuel oil Mazut 100 is supplied according to the Russian technical specification GOST 10585-99, section for fuel oil, Mazut sort 100.

This kind of oil is graded as the heavy furnace oil. The product is produced from the remains of raw oil processing. This kind of Mazut is produced only from the low Sulphur raw oil. Origin country for this kind of Mazut is only Russia. It is very limited volume of this Mazut available for export from Russia because of the following reasons:

1) There is limited number of producers in Russia, who produce this kind of Mazut. All of them are the big Russian oil companies, like Lukoil, Rossibneft, etc.

2) Minimum half of the produced volume is sold on the domestic market of Russia and CIS.

3) Most of the volumes for export are sold according to the state quotes to the state companies abroad.

4) The remaining export volumes are sold by the daughter commercial organizations of the oil producers to the highest bidder