Good pun Lamar "shedding some light" but is a 2000 hr test sufficient? Is the light level much more intense than standard sunlight intensity and if so how much? (I don't have a copy of G154).
Bob Landman
Sent from my iPhone
On Nov 12, 2010, at 2:47 PM, Lamar Young <[log in to unmask]> wrote:
> 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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