I read through some archives on OSP boards but didn't find as much as I
think I may need.

We have OSP boards that are run through topside reflow, bottomside reflow,
wave solder processes.  These processes use water based pastes/fluxes.
(Which I gather may be the cause of the residue?)

The residue we see is not very prominent - seems to "outline" or shadow the
circuitry if you will.

What are other experiences with OSP finishes and white residues?   Do you
let go as is?  The residue is permanent and does not come off with Proclean
or aqueous wash.

Jan Pelchat

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