Mark,
I know of no written resources about this, but I would recommend an extra
thorough cleaning of your reflow oven.  It could be that what you are
getting is the redistribution of "captive" solder balls that have been
hanging around inside your oven.  I wouldn't fool around with the reflow
profiles too much without first talking to your paste vendor.

regards,
Bev Christian
Research in Motion

-----Original Message-----
From: Mark Stalcup [mailto:[log in to unmask]]
Sent: February 25, 2002 12:56 PM
To: [log in to unmask]
Subject: [TN] Solder Spatter


I am looking for some help concerning solder spatter.  I manufacture
ceramic hybrids that have gold plated terminal blocks (50 mil square)
placed near the edge of the hybrid.  We contiually see solder spatter
randomly located on the top of the blocks at at yield hit of anywhere from
2 to 30 percent.  We have set our oven profile such that there is the
minimum amount of preheat ramp, and we reflow in air.  Could anyone provide
some help on how to deal with this?  Any good resources for information,
abstracts, etc. that would help out?

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