Hi Mark,

We used Double Treat in my last shop and saw the same scratches.  The
troubling thing was opening a new pack from the manufacturer and seeing the
scratches.  The answer I got back - the scratches were probably cosmetic
but use your judgment.  If it was a huge problem wouldn't you see
delamination or have trouble with photoresist adhesion during an in-process
step were it was scratched?

Hans

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Process Engineer
Toppan Electronics, Inc.
770 Miramar Road
San Diego, CA 92126
(858) 695 - 2222 ext. 241
(858) 695 - 6823 fax
[log in to unmask]



-----Original Message-----
From: Mark Hargreaves [mailto:[log in to unmask]]
Sent: Monday, December 11, 2000 1:34 PM
To: [log in to unmask]
Subject: [TN] Scratched double treat material


Hi All,
     The double treat inner layer material we use often arrives with surface
scratches - deep enough to be seen, but not deep enough to affect the
underlying copper.  These scratches are visible on the finished boards.  Is
this a cosmetic defect, or worse?  Is board performance affected?  Should
our vendor be slipsheeting this material?  Which essential question have I
forgotten to ask?

Thanks in Advance,
Mark Hargreaves

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