Power your EDM with Tokai’s HK Iso-Static range — pioneered in the 1980s and still the global benchmark. Our Graphite is engineered for fast, easy machining with minimal tool wear, delivering razor-sharp, consistent finishes across a variety of grades for cost-performance optimisation.
We offer dedicated technical support and precision production of made-to-order electrodes. With continuous innovation and state-of-the-art machining, Tokai helps toolmakers worldwide push EDM to its limits.
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) |
| HK-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:
