We are seeing a condition that has seemed to become a problem in our
Manufacture of PCB's.  We are seeing a film or slight amount of particulate
matter on some of our solder joints.  It gives a dull appearance that
almost looks rough.  The substance is dry, and can be brushed away with a
dry medium coarse brush.  It seems to only adhere to low areas ie the
bottom of a fillet.  If an excessive amount of solder is on the joint, the
joint appears shiny and smooth.  We use an Aqueous cleaner (Electrovert)
and a Armakleen soap solution for cleaning.  We change the soap once a week
and we only do a moderate to small volume business.  Anyone have any ideas?

Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
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