Doug,
I do not know of any papers specific to conformal coatings. And as far as
coatings other than Parylene, I think other manufactures should supply
information. But, we know a bit about Parylenes and have performed
several accelerated UV tests internally.
It is fairly well known that the normal C, N, and D Parylenes do not hold
up well to outdoor sunlight exposure. However, Parylene HT (a fluorinated
version) that Kevin mentions below, is very UV stable. We have performed
accelerated UV exposure in a UV chamber with over 2000 hours ASTM G154
with minimal impact (other Parylenes can't last to 100 hours). We have
several successful outdoor projects with Parylene HT, such as coating LED
signs. So depending on the application and the coating, it may be
possible.
Hopefully this sheds some light on your question.
Lamar
From: "Glidden, Kevin" <[log in to unmask]>
To: [log in to unmask]
Date: 11/11/2010 08:30 AM
Subject: Re: [TN] UV radiation and conformal coating
Sent by: TechNet <[log in to unmask]>
Doug,
Sorry I can't offer any known articles, but I would be interested in
seeing if there are any out there.
Our vendor tells us that the urethanes will discolor to a yellow and
eventually brown tint with continued UV exposure, and eventually be more
susceptible to cracking. We've witnessed this on the coating build-up of
some fixtures we run through the UV tunnel multiple times.
I have heard of a new parylene coating (parylene HT) that was developed to
have increased UV resistance, but I have not seen it used yet.
Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.
-----Original Message-----
From: Douglas Pauls [mailto:[log in to unmask]]
Sent: Thursday, November 11, 2010 8:20 AM
To: [log in to unmask]
Subject: [TN] UV radiation and conformal coating
Good morning all,
Does anyone know of any papers on the effects of UV light on conformal
coating? Not talking the cosmic radiation hard space kind. I know it
would be wavelength and intensity specific. Got a question from one of
our engineers and I, of course, gave the very intelligent answer of "Beats
me". But I have this wonderful resourse called Technet...............
Doug Pauls
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