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Difference between ETP and OFHC copper? Which retains its color a long time?

What is the difference between ETP grade copper and OFHC copper? which of the these 2 retains its color for a longer duration? I am asking for selective plating purposes.

If I selective plate (silver plate) these two, which would be retaining the original color rather than becoming blackish due to oxidation?

Hope to get a reply soon.

Nikhil Makuny
Engineer - Maharashtra, India
February 21, 2011

Hi Nikhil,

Usually OFHC (Oxygen free high conductivity) copper is less prone to oxidation than ETP (Electrolytic tough pitch) copper which contains ~0.03% oxygen.

Regards,
David

David Shiu
- Singapore
February 25, 2011

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