FireCarb is a high quality expandable graphite product. Expandable graphite belongs to a group of products called intumescent; their main property is the ability to expand when heated.

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Paul Pasquino

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FireCarb is based on a high quality Chinese crystalline flake graphite, it’s structure is in the form of layered sheets of carbon atoms. In a process known as intercalation, an acid solution is placed between the carbon layers. Following manufacture, the material is thoroughly washed and dried trapping the solutions within the platelets. The end result is a dry, pourable, clean material with minimal surface acidity.

Expandable graphite

Expandable graphite belongs to a group of products called ‘intumescents’; the main property of which is the ability to expand when heated. On exposure to heat the retained solutions within FireCarb produce a gas that expands and forces open the graphite platelets.

The tremendous expansion that expandable graphite offers (up to 350 x volume at 1000°C) makes it more effective than conventional intumescents. This expansion has the added benefit of creating high pressure, especially when mechanically restricted. At the same time an insulating carbonaceous char is formed which protects the substructure from the heat source.

Typically expansion starts at 170°C, and standard FireCarb grades demonstrate both a good onset of expansion at relatively low temperature and a high total volume of expansion.

FireCarb standard grades

Please find our FireCarb product range including the typical properties per grade below:

Expansion ml [°C]
Particle size
80% > 300 µm
80% > 300 µm
80% > 300 µm
80% > 180 µm
95% < 250 µm

Customised products are available upon request – these include delayed expansion (DE); high initial expansion (A); and modified pH (H) grades.

FireCarb packaging

Our FireCarb product range is available in paper sacks or big bags. Due to the products conditions no bulk solution is available.

The typical properties of FireCarb are:

Physical properties of FireCarb

Expansion onset temperature (°C)
Carbon content (wt.%)
90 min.
pH value
4 - 7
Volatiles (%)
< 12
Loose bulk density (kg/l)
0.45 - 0.50

Expandable graphite origin

LKAB Minerals use high quality Chinese expandable graphite for its FireCarb products.

Expandable graphite toxicology

A non-toxic, non-hazardous stable mineral. You can download the Safety Data Sheet in the section on the right hand side for further information.

Safety Data Sheet

Downloads on request