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Date: | Wed, 25 Sep 96 14:30:18 PST |
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Yup, sounds like a Band-Aid to me. This is a carry-over from the
days when dryfilm soldermask was more popular. An oxide coating
on outerlayers can improve adhesion of soldermask; but should not
be necessary with most masks in use today.
On the other hand, if the end user has no objection, it shouldn't
hurt.
Mark Dowding
Multek, Irvine
______________________________ Reply Separator _________________________________
Subject: Black oxide on outer layers
Author: [log in to unmask] at INTERNET_GATEWAY
Date: 9/25/96 12:03 PM
Greetings !
The Fab house that we use has recently asked us if they could use a black
oxide treatment on external layers of our designs. I know that this process
is used for internal layers but I want to know if any of you have used it
for external layers ? Their reason for using it is " To create better
adhesion for the solder mask and eliminate potential slivers ". To me, this
sounds more like a process problem. What do you think ?
To recap, do any of you use a black oxide coating on outer layers ? If so,
why ?. If not, why not ?
Thanks in advance for your help !
Lou Takach
Union Switch & Signal Inc.
412.688.2574 (voice)
412.688.2399 (fax)
[log in to unmask]
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