Dear Net,

Thanks for all your input.This job surprises me all the time, just when I
think I have all
the variables under control- I miss one! Technically, I knew the bath temp
limits but
didn't consider the temp of the panel entering the plating tank. With the DML
we've
had smutting issues before which we solved with an aggressive hot acid
cleaner,
a generic Na Persulfate microetch w/1% H2SO4 and warmer rinsing. Typical
milder
non-etching cleaners did not work for us. We went to warm water (redirected
cooling water from our etcher) to better rinse off persulfate residues. We
didn't
realize we were also averting cold weather smutting issues until the filter
clogged
(we subsidize the rinse volume with tap) and the rinse temps went down to 58
F.
Now, we know. Today the rinse temps are at 100 F and they are plating
beautifully!

Thanks Again,
Julie Dixon

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################