SIGRATHERM® High Density Graphite Foil



High density SIGRATHERM flexible graphite foil is a homogeneous material manufactured from natural graphite without the use of adhesives or binders.

SIGRATHERM HD graphite foil’s excellent thermal as well as electrical conductivity are both anisotropic, i.e. have a high degree of directional dependence. As the degree of compression rises, the individual graphite crystals are increasingly oriented within the sheet plane. As a result, the anisotropy of conductivity becomes more pronounced.

The advantages of SIGRATHERM® High Density Graphite Foil are:

  • Very good thermal and electrical conductivity
  • Long term stability
  • Flexibility
  • Oxidation resistance
  • Corrosion resistance



Thickness t

0.15 - 1.5 mm


Electrical resistivity ρel

5E-6 Ω·m at 20 °C

in plane

Electrical resistivity, transverse ρel,trans

7.999999999999999E-4 Ω·m at 20 °C

through plane


Bulk density ρbulk

1.3 - 1.8 g/cm³ at 20 °C

Material Information


Available in roll or sheet format depending on thickness and density.


Thermal conductivity λ

300 - 500 W/(m·K) at 20 °C

in plane

Thermal conductivity, transverse λtrans

5 W/(m·K) at 20 °C

through plane

Technological properties

Application areas

Many heat dissipation applications benefit from the outstanding properties of our SIGRATHERM high density (HD) foils.

This material data has been provided by SGL Carbon.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.