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November 2017

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Subject:
From:
Yuan-chia Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Yuan-chia Joyce Koo <[log in to unmask]>
Date:
Wed, 8 Nov 2017 20:02:47 -0500
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make sure what ever you qual is truly reflect to your process, not  
just binary (pwb surface to conformal coat for example, not the pwb  
surface go through reflow, wave, cleanning, to conformal coat, etc.   
make sure you do a theoretical study to root out non-compatible one  
(or high risk one), for example, some UV curable conformal coat can  
be easily poison by moisture, or organic residue (if it use  
organometallic initiator)... if theoretical tell you it is not  
compatible, go find another... do not try many times and fall in love  
with it... (GE used to have the best conformal coat in the  
aerospace... I guess those chaps are all in the cottage now... if you  
are lucky enough to dig one or two out, you will cut cost by  
millions... beef up GE stock big time... - I am GE stock holder, not  
very happy about the price at the moment)..
jk
On Nov 8, 2017, at 5:49 PM, Elson, Ryan(BHGE) wrote:

> Hello all,
>
> We are looking at qualifying a new conformal coating, and have a  
> number of requirements for manufacturability and inherent  
> properties, meets IPC-CC-830 requirements, certain CTI rating,  
> etc., and we have put together a lengthy test plan that includes  
> different types of boards, including those with sensitive  
> circuitry, boards with low surface energies, and the like. But I  
> wanted to see what other industry standards we need to check and  
> make sure we're not missing anything.
>
> I think SIR testing with our existing solder paste & wave flux is  
> the big one, and I was planning to use B-24 test coupons. We are  
> also doing adhesion testing, checking against IPC-A-610  
> requirements, HASS testing, final testing, as well as various  
> checks for manufacturability (such as viscosity and ability to coat  
> with our selective spray equipment, good wetting at lower surface  
> energies, ease of rework).
>
> What else are we missing? Any other IPC test methods or  
> compatibility checks to be concerned with?
>
> Thanks!
> Ryan Elson
> Manufacturing Engineer
> Bently Nevada
> Baker Hughes, a GE company
> [log in to unmask]<mailto:[log in to unmask]>

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