Electrodes can be made from any conductive material. Depending on the nature of the application, electrodes are typically from graphite.
Graphite Electrodes Tokai Carbon Co., Ltd.
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Why is graphite used for electrodes?
China Used Graphite Electrodes, Used Graphite Electrodes
Why is graphite used to make electrodes? - Quora
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Why are graphite electrodes used?
RP Graphite Electrode - Used in electric arc furnace
Why is graphite used to make electrodes? - Quora
Why is graphite used to make electrodes? - Quora