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Date: | Fri, 6 Nov 1998 04:06:35 -0600 |
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Hi Connie,
Yes I have heard and used the term "shiner" before but only in the context of a small bright spot on the copper. what you are describing sounds like it could be one of two things.
1. Pink ring. - If the board is a multilayer and the spots are
located around or between holes that have either
large internal plane or pad. This could be what you
are seeing.
2. Pregel - This is a term I haven't used in a while but sometimes
you can get what looks likes small white spots just
below the surface of the laminate. This can be
caused by permature curing of the resin during the
lamination process. I used to deal with this condition
frequently when I worked with BT resin lamininate a
few years ago.
In either case, if there is not evidence of actual separtion I don't think it will cause you any problems. However, without actually seeing the condition, this is just a guess. Sorry I could be more helpful.
Ed Cosper
Director Quality Assurance and Engineering
Graphic Electronics Inc.
Tulsa OK.
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From: Connie Korth
Sent: Thursday, November 05, 1998 9:41 AM
To: [log in to unmask]
Subject: [TN] Bare Board imperfections
Good Morning,
I don't know how to explain this, but here goes... I have a bare board with,
what appears to be, delamination but I don't think it is.(can't identify any
layer separation). There are four spots in the board (not on surface) that
are much lighter than the rest of the board. These areas are in line with
each other. Someone said it looked like a 'shiner'. Has anyone heard this
term before? If so, what is it, what causes this condition, and is there
any document referring to the acceptability of the condition? I looked
through the IPC-A-600, but couldn't find anything that resembled this.
From someone who's trying to learn...
ps(I'm not real familiar with bare board acceptability conditions like this
so be gentle)
Connie Korth
K-Byte Hibbing Manufacturing
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