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EDM - Tokai Carbon Europe


Tokai introduced its range of Iso-Static materials to the market place in the early 1980s, the new materials were named HK (Hoden Kako) which is the Japanese description for Electrical Discharge Machining. We at Tokai Carbon have fast become one of the leading suppliers of Iso-Static EDM Graphites in the world.
Throughout the technical growth of EDM applications Tokai has always been a creator of new and innovative materials to push and challenge the boundaries of EDM applications. Our aim is to develop new materials to match the demand of new tools steels and exotic materials. We are always striving to manufacture new materials that can be seen as cost effective solutions for the modern toolmakers throughout the world.
We aim to prove that not all Graphite’s are the same quality although they appear to be the same colour. Tokais range of EDM Graphites offer;

  • High Speed and Low Wear Properties.
  • Consistent Surface Finishing capabilities.
  • A variety of grade choices to offer Cost Effective EDM solutions.
  • Technical support to end users to achieve the best results from the EDM process

Tokai Carbon Europe Ltd has invested heavily in state of the art technology to enable us to produce finished components for all Graphite and Carbon applications. Our vision is to be innovative and quality led in the manufacture and design of all our machined and base products.

Our VDI Comparison Chart can be used to find out the surface finish each grade is capable of achieving.

The materials and grades recommended by Tokai Carbon for these applications are shown in the table below:

Material Type Avg Density (g/cc) Specific Resistance (µΩm) Flexural Strength (MPa) Hardness (Shore) Avg Grain Size (µm)
K-0 1.8 12 39 56 13
HK-1 1.85 11 50 58 11
HK-10 1.84 12 52 54 9
HK-15 1.83 12.5 54 62 7
HK-20 1.86 12 66 60 6
HK-2 1.82 13.5 64 64 7
HK-75 1.82 16.5 66 72 4
HK-3 1.84 15.5 88 78 2
HK-6 1.86 12 85 68 3
HK-2C 2.79 2.3 77 67 7
HK-6C 2.68 3.1 110 70 3

For an overview of the range of graphite available for EDM applications please download using the link below: