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September 2003

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Subject:
From:
Rudy Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 18 Sep 2003 04:48:58 -0400
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Are you etching with Cupric, or Ammoniacal etchant?  Ammoniacal is quite sensitive to tarnish on the board, so if your boards are tarnishing, this could be the problem...

What do the shorts look like?  Can you send us a picture?

Lots of resin spots popping up in the industry lately, not, of course, that I would want to blame the copper foil, or laminate from any particular part of the world... and this could be causing your problems...do you check laminat with black light as a part of inspection?  Might be a real good idea to begin, if you are not... One of the Sanmina's found innerlayer shorts almost completely related to resin spots on the Copper...

Good luck from Shenzhen China..
Rudy Sedlak, RD Chemical Company

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