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Metallic resist for cupric chloride etchant?

 

We are a flexible printed circuit manufacturer and use a Cupric Chloride (acid based) etchant. While this is fine for a photoresist process, I would like to know if anyone has experience using any metallic platings as an etch resist ? Someone suggested a tin-nickel plate, does that work? It is my experience that this etchant will etch nickel, tin, tin lead.. etc. Any experience or suggestions?

Richard Breslin
- Lowell, Massachusetts

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Ed. note: You may want to hear "The Lost Art of Tin-Nickel Plating".

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I would think that something along the lines of gold would work.

James Totter, CEF
- Tallahassee, Florida
 

I know those who have used gold successfully as a resist in cupric etching processes. You must control carefully because you can undercut the nickel and cause gold slivers.

Scott Campbell
- Tempe, Arizona, USA
 

You will find that gold works well, We usually use about 1 micron of hard gold with no nickel.

John Yarno
- Snoqualmie, Washington