Kathy,

Certainly looks like a typical case of delamination. Do you know if the
delamination you're seeing is mask lifting off the circuit board, or in the
circuit board base material?

Jeff Ferry
CEO
Circuit Technology Center, Inc.
www.circuittechctr.com
[log in to unmask]
978-374-5000



-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Tuesday, February 05, 2002 2:24 PM
To: [log in to unmask]
Subject: [TN] PCB Question


I have a few assemblies that a customer had asked me to look at and I
noticed an oddity around the vias.  It looks like there is delamination
around the vias.  Steve was kind enough to post these photo's on his web
page for all to view.  I need to know if this is delamination or just
haloing. I saw an issue like this a long time ago (15 years ago) and at that
time we scrapped them because we didn't know what the issue was caused by.
Some at that time thought the drill bit for that size was either pushed to
fast through the material causing a slight delanmination or the drill bit
was dull.

I appreciate any assistance or thoughts on the issue.  I have already
suggested that a cross section may have to be completed.

http://www.stevezeva.homestead.com

Thanks in advance.

Kathy

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