The hydrogen and
fuel cell center

Your Contact

Dipl.-Ing. Marco Grundler

group leader compound
Department fuel cells and stacks

Tel.: +49-203-7598-1175

Highly filled grafite compounds and masterbatches for electronic and thermal applications


ZBT develops highly filled composites mainly based on carbon filler materials e.g.:

  • Graphite
  • Carbon black
  • Carbon fibres, carbon nanofibres and carbon nanotubes
  • Graphene

nearly in every thermoplastic resin.

With a filler content of up to 85 wt% (approx. 67 vol%) these Composites show a very high electrical and thermal conductivity which is comparable to stainless steel. Furthermore, owing the chemical stability of a plastic these materials are excellently chemically corrosion stable.

Compound materials

Despite the high filler content, such composites are especially designed for injection moulding and can be tailored on customer demands and used for the following:

  • Low exposure masterbatches for resource-conserving processing
  • Conductive sealing
  • Electrode materials
  • Heat Sink Applications
  • Polymer based non-corrosive heat exchangers
  • Tribologic applications
  • Self extinguishing plastics
  • Compound based bipolar plates for HT- and NT-fuel cells

Despite processing via injection moulding one main benefit of those materials is the process ability by nearly every shaping method such as

  • Extrusion (sheet, tube…)
  • Role to Role e.g. calendaring
  • Hotpressing

More information here


Furthermore, ZBT offers the service to design composites on customer demands with additional fillers e.g. barium sulphate, Boron nitride or metals.

For characterisation ZBT offers the following equipment:

  • Small piston injection moulding machine for samples
  • Helium pycnometer for measuring the density
  • Four pole measurement for determining the electrical conductivity (separated in bulk and contact resistivity and for different pressures and temperatures)
  • Hot Disc apparatus for measuring the thermal conductivity)
  • Ex-situ accelerated ageing of the composites
  • Topographically and microscopically analyses
Last update:  31.03.2020