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Blair: My suspicion is that IC will tell you essentially nothing. From the sound of your highly technical description, I would bet the residue is largely organic, and most organics do not ionize, so IC would tell you little.

It MIGHT be flux residue, what sort are they using?

Would recommend trying to dissolve the residue in a solvent, and send out for GC-Mass spec.

Even an elemental analysis would give you a direction to move in.

Rudy Sedlak
RD Chemical Company

Blair Hogg <[log in to unmask]> wrote: We are having an issues with printed circuit boards showing residues,
that become more prevalent after heating cycles. It leaves a shiny / oily
looking film that is somewhat splotchy. Sorry for all these technical
terms.

I'm suspecting undercured epoxy, and I am currently looking to send
some out for chemical analysis. I have one lab quoting IC, and another's
website also recommends FT-IR. The supplier performed a ROSE test
and says there is no ionic contamination. The biggest problem we are
having is with conformal coating adherance. Due to certain components
on the one board that gives us trouble we aren't able to run it trhough
our aqueous wash cycle.

Is Ion Chromatography the right test? Any other suggestions?

Thanks,

Blair

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