TechNet,
I need advice badly.  In our wave solder process we use no clean flux.
We have an application where the assembled pcb has to be conformally
coated to withstand up to 100% condensing humidity and 95% non
condensing humidity in ambient temp ranges from -20deg C to +85 deg. C.
A concern has come up with the long term reliability of the conformal
coating based on cleanliness of the pcb prior to spraying the silicone
or polyureathene coating (from previous posts, I am assuming silicone
will be the best of the two solutions).  It has been suggested that we
water wash the pcb after solder before application of the coatings.  The
board is double sided with larger magnetics on the component side and
includes SMT.  In your experience, has anyone had problems using no
clean flux in conjunction with silicone coatings with respect to field
reliability?

Regards,

Mike Waters
Phone:  919-767-3815
Fax:    919-767-3966

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