Graphite for electrical discharge machining (EDM) Graphite is used as an electrode material in electrical discharge machining. Compared to copper, graphite offers a number of advantages that benefit the entire process chain of molding and forging tool manufacture. These advantages significantly reduce the cost of tools manufactured by electrical discharge machining, while maintaining or even enhancing quality standards.
Spark & Co. offers a wide range of electrical discharge electrodes with finishes ranging from coarsely roughened to ultrafine. We supply standard semifinished products in rectangular and other formats, as well as blanks manufactured to customer specification and also ready-to-use electrodes matched to your clamping system.
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Physical Property
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R8340
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R8500
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R8510
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R8650
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R8710
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Average Grain Size/ Microns
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15
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10
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10
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7
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3
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Density g/cm3
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1.72
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1.77
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1.83
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1.84
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1.88
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Porosity %
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15
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13
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10
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10
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10
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Hardness / Shore
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50
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65
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70
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75
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80
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Electrical Resis. x10-5 ohm-inch
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47
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55
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51
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55
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51
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Flexural Strength/ PSI
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6 500
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7 250
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8 700
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9 400
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12 300
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Compressive Strength/ PSI
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13 050
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17 400
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18 150
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21 750
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24 650
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