So your plan seems rather thorough to me. I am assuming you are about to launch an effort that will study several coatings.
Some related thoughts may include:
> Be sure you have a good handle on what you coverage expectations are. Especially for components.
> If coatings are to be diluted with thinner , don't under estimate the impact that the degree of dilution with thinner can have on numerous performance attributes.
> if you are looking at 2 part coatings be sure that you are aware of the pot-life of your mix and control to it during you evaluation.
> if masking will be required the targeted assemblies be sure you look for coating masking interactions . Lifting of tape edges, ease of demasking, dewetting caused near masked area's unique to certain coating types.
Rich Kraszewski
Senior Staff Process Engineer
Plexus Engineering Solutions
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Elson, Ryan(BHGE)
Sent: Wednesday, November 08, 2017 4:49 PM
To: [log in to unmask]
Subject: [TN] Conformal Coating qualification
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
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