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Fixed Carbon


Fixed carbon is the solid combustible residue that remains after a sample is heated at 900 degrees Celsius for a period of 7 minutes and the volatile matter is expelled. The fixed-carbon content of the sample is then calculated according to the following formulae:

On a dry matter basis:

Fixed Carbon (%) = 100 - Ash(% Dry Basis) - Volatile Matter(% Dry Basis)

On an as-received basis:

Fixed Carbon (%) = 100 - Ash(% As-Received) - Moisture Content(% As-Received) - Volatile Matter(% As-Received)

On a dry ash-free basis:

Fixed Carbon (%) = 100 - Volatile Matter(% Dry Ash-Free Basis)

Click here to place an order for determining Fixed Carbon.





Analysis Packages for Fixed Carbon

The Celignis Analysis Package(s) that determine this constituent are listed below:

P32   Proximate Analysis
Moisture, Ash, Volatile Matter, Fixed Carbon

Further Details


P40   Combustion Package
Volatile Matter, Fixed Carbon, Moisture, Ash, Carbon, Hydrogen, Nitrogen, Sulphur, Oxygen, Gross Calorific Value, Net Calorific Value, Chlorine

Further Details


Equipment Used for Fixed Carbon Analysis

Additional Material

We can determine the Fixed Carbon content of biomass, click here to learn more about our various biomass analysis methods.

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