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January 2005

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Subject:
From:
Pete menuez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Pete menuez <[log in to unmask]>
Date:
Tue, 11 Jan 2005 08:07:47 -0500
Content-Type:
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text/plain (65 lines)
This is probably a normal (acceptable) condition.  As to why earlier
sections showed no demarcation line and this one did may be the amount of
etch used to expose the demarcation line.  Some shops like to etch as little
as possible - to just expose the demarcation - so they don't discolor the
electroless.  Electroless copper, if this is what was used, may turn black
making the connection look separated.

It is always a good idea to review the sections prior to etch to see if
there is any separation. Some one may want to challenge me on this but
generally if you have post separation you will see it before etch. (An
exception to this is if the cross section grinding smeared copper across the
interface hiding the separation.)

pete





>From: "Finks, Tim (Healdsburg)" <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              "Finks, Tim
>(Healdsburg)" <[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Inner layer to barrel connection quality
>Date: Mon, 10 Jan 2005 14:15:29 -0800
>
>I have PTH cross-section images which show a visible interface between
>inner
>layer foils and the PTH plating. Earlier, similar, board cross-sections
>show
>no discernable interface - the inner layer foil and the barrel plating
>appear to be integral.
>
>What should I see when I have an acceptable PWB?
>
>
>
>Regards,
>
>Tim Finks
>
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