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 diesel.
Mazut may be used for heating houses in former USSR and in countries of Far East that do not have the facilities to blend or break it down into more traditional 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 or 99. (GOST is the Russian system of standards, much like ASTM D396, for example). Mazut is almost exclusively manufactured in the Russian Federation, Kazakhstan, Azerbaijan
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. It has a very limited volume to be exported because: difference between origins, and the main difference is the price. The Russian origin mazut demands higher prices.