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PCB coating

What are the typical coating materials over the bare copper? If there isn't any coating, then when does the copper start to oxide?

Criss Hoang
- Camarillo, California, USA

You need to be much more specific on this as there are so many coatings (Tin, Gold, Nickel, Tin-lead etc). Or are you referring to a screened resist or dry film resist or even peelable resist? Also length of time that copper will remain un-tarnished depends on where & how you store it! Stephen Collis
- England

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