I think the substrate itself is far more hygroscopic than either the mask or
the lettering ink.
Unless the inks aren't fully cured.
But to your point: It's quite possible to have a polymer mask and a UV
letter screen.
Or combinations including epoxy inks.
So out-gassing, if any, would not necessarily have to be the same for the
solder mask as for the silk screen.
But I'm curious: Why letter screen at-all?
- Are these boards being hand assembled?
- Is the lettering functional for repair purposes?
Most of the boards we fab today are so dense you can't even see the
post-assembly board. So unless you're hand-popping parts why risk ink-on-pads -- with
or without out-gassing?
Think I'll go tear some tags off of pillows...
ROBERT LAZZARA
VP, Business Development
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Circuit Connect, Inc.
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