A graphite electrode ;is nothing more than a sharp graphite rod, taken from a pile, subject to a support conductor of the current, a copper tube, and at a reasonable distance a plastic handle, a PVC tube. The handle should be far enough away so that it does not reach so much heat to soften it. Anyway, it is clear that PVC is the worst plastic that can be used for this but it was there.
http://www.shj-carbon.com/grap....hite-products/graphi
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