If at all possible please keep me posted on this issue. Very much
interested on how analysts approach the task at hand to explain an
anomalies observed on cross sections and the instruments they select to
support their findings.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Tuesday, May 20, 2008 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] Blue Voids
Well, since our supplier hadn't seen this condition in their
microsections,
and the independent lab used different equipment (Scanning Electron
Microscope
and Differential Interference Contrast photography), the question became
whether
the supplier's lab could even see the condition if it was present.
The independent lab still has the sample panel with the known condition,
and
they
agreed to send back half of the panel so the supplier can experiment
with
it.
In the meantime, our company issued a corrective action request so we
get
some
kind of follow-up on the results.
Thanks to everyone who looked at the evidence and sent their opinion.
http://frontdoor.biz/PCBportal/bluevoid.jpg
p.s. I think its kind of fun to do this (especially when it is not MY
company's sample)
Maybe we should have more community "case studies", I find the group
feedback to be very educational, especially when the descriptions in
IPC-A-600
are vague.
Thanks again.
onward thru the fog,
Jack
-----Original Message-----
What became of this issue? I have not seen any more threads of e-mail.
Victor,
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Tuesday, April 29, 2008 9:59 PM
To: [log in to unmask]
Subject: Re: [TN] Blue Voids
Are the voids in the glass bundle or between the glass bundle and the
resin?
If the former, you have a glass supplier problem (not all the weaving
assistant burned off?)-- if the latter, then I would suspect incorrect
pH in the
adhesion promoter application bath.
Bill Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO 80526
Tel: 970.207.9586 Cell: 970.980.6373
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