A cathode – a 50 to 80 kg copper square – is produced when pure copper separates from unwrought copper in an electrolytic refining process. Copper cathodes with specific maximum impurity levels are also registered and traded on the London Metal Exchange and the Comex. High-quality copper is distinguished by low impurity levels, as even the smallest amounts of selenium, bismuth or antimony in the ppm range can strongly influence conductivity.
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