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January 1997

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Sat, 18 Jan 1997 17:16:07 -0500 (EST)
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0.001" over 2 oz is a tall order, especially if you are looking for that
thickness over the knee and require 100% even on plated, isolated circuits.

You can try:

1) softer (50/60 durometer squeegee material
2) lower mesh counts (87)
3) faster print speeds without allowing skips
4) higher angles (30 - 33 deg.) on squeegee 

Please note: Thicker deposits can lead to changes down the road.  You may
need to increase tack time to avoid photo tool marking.  Higher exposure to
keep undercut to a min.  Solvent boil between tight tracks may also send up
red flags in inspection if you lay the LPI down too thick.

Have you considered a screen - tack - screen - tack process prior to
exposure?

Van Miller
Electra Polymers
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