Hi folks,

In our operation, we currently clean all bare boards before running them
through the assembly process.  After automated assembly (using RMA based
solder paste), the boards are cleaned again in our in-line cleaner or vapor
degreaser.  The bare boards are also cleaned in either the in-line cleaner
or vapor degreaser, both of which are probably over kill.  These boards go
into military radar systems.

My questions are:
1.      Most of our boards come in visually clean.  Occasionally, we get
some boards that look oxidized.  What is the risk of not cleaning?
2.      We're considering a small batch cleaner - something on the order of
a Maytag dishwasher with dishwashing detergent.  I've seen this used in some
small commercial operations.  How wide spread is this practice and does it
make sense?

Kathie Lambert
Process Engineer
Northrop Grumman
Baltimore, MD
410-765-9746

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