John,

We tried stripping HASL once and regretted it. The HASL coating is not
uniform in thickness. The knees of the hole wall are particularly thin. When
our captive board shop tried to strip the solder, they had to continue until
the thickest areas of solder were removed. The knees however stripped much
quicker and thus exposed the underlying copper. We ended up with problems at
the knees.

Thanks,
Robert Furrow
Printed Wiring Board Engineer
Supply Chain Networks
Lucent Technologies
978-960-3224    [log in to unmask]


-----Original Message-----
From: John Foster [mailto:[log in to unmask]]
Sent: Friday, February 14, 2003 7:12 PM
To: [log in to unmask]
Subject: [TN] question about enig


I was wondering. We just got a batch of boards that had a HASL finish when
we needed a ENIG finish. Can the HASL be stripped off and then replaced with
a ENIG finish. Our board house says no problem. But I just wanted to know
what people think. Will this be robust?
Any replies would be appreciated.
Thanks
John Foster

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