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June 1997

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Subject:
Idents and HASL
From:
David Arivett <[log in to unmask]>
Date:
Mon, 30 Jun 1997 16:20:55 -0500 (CDT)
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I would recommend applying idents after HASL. Hot air leveling takes the
board well above its glass transition temperature and them cools it pretty
rapidly. Typically this can cause some distortion in the panel. If a thermal
cure ink is used for idents and the panels are cured horizontally, the
boards are slowly brought to a temperature just above the glass transition
temperature and then cooled slowly. This helps minimize the distortion
sometimes seen on fine pitch product.

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