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Date: | Wed, 30 Apr 1997 16:24:33 -0700 |
Content-Type: | text/plain |
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Tenting .020 holes with a liquid mask is pushing the envelope a
bit. Normally I recommend customers not to exceed .018 holes.
Holes larger than .018 normally use one of the various dry film
masks.
I will contact you off line to discuss options.
Bob Metcalf
Morton Electronic Materials
>>> "LANmark Circuits,Inc." <[log in to unmask]>
04/30/97 11:14am >>>
We've been battling a problem with LPI covering (tenting) larger
vias (>.020).
There is a tendency for the mask to lift around these holes,
particularly in
ground planes, at HAL. We've been drying the panels after scrub
in a heated
board dryer and a quick bake in the oven. We are using
Dynachem Epic mask.
Any input would be appreciated.
John Gordon
LANmark Circuits
LANmark Circuits,Inc.
400 Crown Point Circle
Grass Valley,Ca. 95945
(916)272-7280(voice)
(916)272-7017(fax)
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