SIGRATHERM® ePCM Composite Materials



SIGRATHERM® ePCM Composite Materials guarantee high storage density and fast charge/discharge cycles.

Phase Change Materials (PCM) are materials whose latent heat produced mainly at the solid-liquid phase transition point (heat of fusion), is used in technical applications. Water/ice is the best-known example of a PCM. Salt hydrates as well as paraffins are among the PCMs widely used for other temperature requirements. Pure PCM show high storage density, long charging and discharging cycles and low thermal conductivity.

SIGRATHERM ePCM is a graphite/PCM compound material made from expanded graphite with encapsulated PCM material. It is supplied in plates and sheets.



Length l

300 mm


Thickness t

12 mm


Width w

300 mm



Density ρ

0.85 g/cm³ at 20 °C


Elastic modulus E

105 GPa at 20 °C

Flexural strength σbend

2 MPa at 20 °C


Melting point Tm

28 °C

Specific heat capacity cp

140 J/(kg·K) at 20 °C

Thermal conductivity λ

5 W/(m·K) at 20 °C

in plane

Thermal conductivity, transverse λtrans

2.5 W/(m·K) at 20 °C

through plane

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.