Have you already considered also   IPC-TM-650 2.6.3 MIR  test
http://www.ipc.org/TM/2.6.3F.pdf

1 Scope This test method is to determine the degradation of insulating
materials by examination of the visual and electrical insulation resistance
properties of printed board specimens after exposure to high humidity and
heat conditions. This method allows testing with (Method A) or without
(Method B) Conformal Coating. When not specified, Method A is the default
method.




-----Messaggio originale-----
Da: TechNet [mailto:[log in to unmask]] Per conto di Elson, Ryan(BHGE)
Inviato: mercoledì 8 novembre 2017 23:49
A: [log in to unmask]
Oggetto: [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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