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Date: | Mon, 09 Dec 96 12:15:22 PST8 |
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Surface preparation has a significant impact on Soldermask
adhesion.If you are using a microetch pre-clean check your
anti-tarnish tank for algae or organic scum sticking to the sides. If
so ,try a weekly flush out with bleach and sodium hydroxide.
Also, a short vacuum bake after clean and prior to masking may help
also.
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______________________________ Reply Separator _________________________________
Subject: Soldermask peeling
Author: [log in to unmask] at CCGATE
Date: 12/9/96 5:40 AM
We recently experienced soldermask peeling after wave from
three different Fabricators all within 2 weeks. Subsequently
we took sample lots of each Fabricator and performed a
pre-wave and post-wave tape test. In all lots the boards
passed pre-wave tape test but had a 10-25% failure post wave.
What can cause this phenomena? Does the weather change have
anything to do with soldermask application and durability?
Dan Hickey
Senior Buyer
Vicor
[log in to unmask]
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