The PCA cables list “OCC” copper as a main feature. What is OCC copper and how is it different from conventional oxygen-free copper?
A. The OCC process for refining copper was developed and patented by Professor Ohno of the Chiba Institute of Technology in Japan and is licensed to our manufacturer for use in the production of wire and cable products for the audio/video industry. In conventional processing, hot molten copper is poured into a cooled mold for extrusion, resulting in multiple, fractionated crystal structure. While the copper may be “pure” in the sense of measuring gas impurities in the copper in comparison to standard copper refining techniques, Oxygen Free Copper (OFC) has undesirable effects that lead many to use more expensive materials such as silver for their conductive strands. As developed for A/V cable use, the OCC process utilizes a heated mold for casting and extruding, with cooling taking place in a separate process. The result is a larger crystal size and increased purity that approaches the 6N, 99.9998%! Looking at it another way, traditional copper has oxygen impurities of 200 to 500 parts
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