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COAL. HIS STAMPS
Coal is divided into grades, groups and subgroups within the industrial classification. It is based on the properties of the mineral to react differently to high temperatures. It also takes into account the stage of metamorphism or coalification. The higher it is, the more mature the mineral is. Well-carbonized brands give more heat, less smoke and ash.
In 1988, the classification by brand was agreed with the International Codification System.
According to GOST 25543-2013 (Russian Federation – Russia) , 17 brands of fossil coal are allocated:
Gas fat (GJ)
Gas fat thinned (GJO)
Long-flame gas (DG)
Coke fat (QL)
Coke hauled (CO)
Coke low-energy (CS)
Coke low-grade low-metamorphosis (CSN)
Detached Sintering (OS)
Weakly Sintering (SS)
Skinny slightly sintering (TS)
By clicking on the links, you can read in detail about each brand, its features, characteristics and areas of application. For your convenience, on this page, the table below contains the main indicators of all brands, their main distinguishing features and areas of use
Coal is classified into grades according to the following properties:
The yield of volatile substances during heating
The parameter indicates the maturity (degree of metamorphism or coalification) of the mineral. The lower the content of volatile substances, the less the coal smokes and gives more heat.
Heat of combustion
Indicates how much heat a kilogram of fuel gives during combustion.
Carbon-rich coal has a high calorific value. The amount of the element increases as the degree of carbonification increases.
Maximum moisture capacity (for brown coals)
Shows how much liquid the material can absorb until it is fully saturated. Moisture capacity depends on density and porosity. The indicator is high in brown coals at an early stage of metamorphism, then it decreases.
This is the property of some brands to turn into a plastic mass when heated. It is determined by the thickness of the plastic layer.
Characterizes the degree of maturity (coalification, metamorphism) of a mineral.
Semi-coking resin yield (for brown coals)
These are liquid components that come out when coal is heated. They are valuable sources of organic substances that are used in the chemical and pharmaceutical industries.
Vitrinite anisotropy (for anthracite)
This property of mature vitrinite leads to a double reflection of light depending on the orientation of the rock layers.
Read more about these and other characteristics in the section Properties and characteristics of coal.
In addition, it is worth saying that some brands are divided into groups and subgroups. The data on this is presented in the table below. It also shows which classes, categories, types and subtypes correspond to specific brands of coals. You can read about them in detail in our article Classes, categories, types and subtypes of coal.