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February 2008

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Subject:
From:
"Terry L. Munson" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 21 Feb 2008 18:46:19 EST
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text/plain
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Blair 
I would agree with Rudy. GC-MS will give you more information than IC  
testing. We see these issues when alcohol is used to brush clean areas  nearby.  The 
shinny film is most likely an organic or even a release agent  in packaging 
or handling issues.  
 
 
In a message dated 2/21/2008 4:37:00 P.M. Eastern Standard Time,  
[log in to unmask] writes:

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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