Hi Jack,

You should also consider trying another solder paste, as it's the
combination of fluxresidue and cleaning system that determines the
results. Not all RMA pastes are created equal !
I have seen significant variations in cleanliness results underneath
84-pins LCCC's when testing several brands of RMA-solderpaste, while
keeping the cleaning system as the constant factor.

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

>>> [log in to unmask] 09/26/03 10:25pm >>>
Gentleman (and others):

Our company builds high reliability circuit cards, mostly complying
with J-STD Class 3 or NASA 8739.X. As required in most of our standards,
we must comply with a contamination test (ROSE) prior to shipment and
must achieve a level of <10ug per sq" of Ionic contamination.  The
cleaning system that we use is a Detrex in line with Kyzen I3330. This
chemistry gives us good contamination results and takes care of most of
our RMA cleaning requirements. However, lately we have noticed that we
are not getting good results under tight fitting (about 2 mils) SMT
components.  This may be due to our machines spray under emersion, which
doesn't give us enough impingement to get under these tight fitting
components.  I have a batch cleaner (Unit Design) that might give me
better results in this application, but I have never used any chemistry
in this machine.  I am down selecting various chemistries to put in this
thing and I wonder if any of you have had any experience with them.
Feed!
back of
Good results is  important, and I am especially interested in positive
results that have been achieved cleaning high solids (36%) RMA in both
reflow and wave processes. I am also concerned with any residue that
might be left behind in the batch cleaner and later contaminate
assemblies that require DI only cleaning. I was burned pretty bad in the
past when using Armaclean. I am considering Kyzen  Aquanox and Zestron
Vigon A200.  I have tried Envirogold and had problems with damage to
solder mask, etching and graying of solder joints, I also wasn't
impressed with the bath life that I achieved.  Any comments or
suggestions on this???

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