A bit late in replyiny to this thread but I had 500+ messages when I
got back from holiday!!
Many people apply legend after HASL because a:their legend artwork
requires printing over a pad or b: more often, the clearance around
pads is too tight to be able to guarantee no legend will get on the
pads.
We provide a photoimageable legend ink which eliminates the second of
these reasons and enables the legend operation to be carried out
before HASL with complete confidence.
The benefits of legend before HASL are:-
no flux residues to affect adhesion
no bowed or twisted boards to print
no solder "icicles" to rip screens
combined legend and LPI cure saves time.
photoimageable legend makes for greater legibility and/or finer
lettering.
Contact me for more details.
Chris Wall
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