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February 2008

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Subject:
From:
Joe Russeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joe Russeau <[log in to unmask]>
Date:
Thu, 21 Feb 2008 16:32:05 -0500
Content-Type:
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Hi Blair,

What is the surface finish?  Is there anyway that you could send a photo of 
the residue to Steve?

Best Regards,

Joe Russeau
Process Analyst

Precision Analytical Laboratory, Inc.
4106 Cartwright Drive, Ste A
Kokomo, IN 46902
P: 765-455-1993
F: 765-455-1996
www.precisionanalysts.com

----- Original Message ----- 
From: "Blair Hogg" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 21, 2008 3:52 PM
Subject: [TN] Residues


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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