The search continues: graphite or copper – which to choose?

Related Vendors

HASCO Hasenclever GmbH + Co KG

BORIDE Engineered Abrasives

Meusburger Georg GmbH & Co. KG

Poco Graphite, Inc. an Entegris Company

Copper electrodes achieved a finer surface finish

Poco Graphite quoted the copper electrodes to achieve a slightly finer surface finish in the cavity than the graphite electrodes did. However, neither electrode material met the surface finish prerequisite of 20 VDI.

Using an average of six measurement points, the graphite achieved a 24 VDI finish, while the copper had a surface finish of 22 VDI. With both electrode materials, a post-polishing process will be required to bring the final surface finish to the required 20 VDI finish.

While there is absolutely no perfect material for all EDM applications, the result of the test may give a better understanding of the reason why graphite is becoming the preferred material on a global scale, the company said.

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