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January 2004

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Subject:
Re: Low level shiny copper spots after cupric chloride etching
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 28 Jan 2004 09:27:22 +0200
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text/plain (46 lines) 
So you can imagine what this does to solderability on outer layers,
bearing in mind that most subsequent copper plating is epitaxial.

Brian

Rudy Sedlak wrote:
> Catherine Smith:
>
> One of our customers began experiencing this, and we did some pretty thorough
> research, and found it was exactly what Phil thought it was...holes in the
> Copper foil, allowing epoxy resin to seep through.
>
> The customer set up incoming inspection on laminate using a black
> light...FR-4 glows when hit by black light...and has gotten their vendor to be more
> careful of the Copper they use.
>
> We are seeing a lot of Copper foil being imported that is not up to the usual
> standards, and it seems to cause this problem more often.
>
> Good luck...
>
> Rudy Sedlak
> RD Chemical Company
>
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