Mazut M100 GOST 10585-99

Mazut-M100 is a fuel oil that is manufactured to GOST specifications, GOST 10585-75 (not active), GOST 10585-99 Oil fuel. 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 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 Mazut with a Sulphur content of 0.5%
  • “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%


COMPONENT Result Guaranteed ASTM Method
Specification Gravity at 20 deg CC 0.88 oo 0.865-890 D-V 1298
Kin Viscosity at 40 C deg (cst) 40 C 9.35 4.0-20 D-V 445
Kin Viscosity at 100 C deg (cst) 1.06 Less 1.50 D-V 445
Flash point (coc) C 60 75 Max D-V 92
Pour Point c Deg -5 10 Max D-V 97
Total acid no mg kon/gh 0.013 0.05 Max D-V 974
Conradson Carbon 0.08 0.1 Max D-V 524
Ash Convert wt % 0.1 Max D-V 482
Water Content 0.1 Max D-V 95
Colour (astm) 3 3.0-3.5 D-V 95
Sulphur wt % 0/3.5 0.5 D-v 1500
Oxidation tex (Viscosity ratio) 1.2 1.2 Max IP 48
Vanadium ppm 50 Max
Sodium 43 38-44
Distillation Range 760 MM HG
Initial Boiling Poing Deg C 216
35-45% Recovered Deg C 350
95% Recovered Deg C 395
End Boiling Point Deg C 400