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February 2005

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Subject:
Re: Seeking data on temperature impact on Type UR conformal voating
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, David Douthit <[log in to unmask]>
Date:
Mon, 7 Feb 2005 21:50:39 -0700
Content-Type:
text/plain
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text/plain (45 lines) 
Bogert,

I believe you are asking about urethane coating material. The first
thing you need to Know is what the Tg (Glass Transition) temperature is.
The most common fversions generally have a Tg of
around 55 degrees C. If this is the case with your coating then at the
temperatures you indicated the
material may "revert" back to a liquid state or at least become very
soft. At some point it will begin to carbonize and become conductive.

David A. Douthit
Manager
LoCan LLC

- Bogert wrote:

>February 7, 2005
>
>Does anyone have info on how much Type UR conformal coating degrades at temperatures > 125C?  How much does the dielectric strength and insulation resistance degrade with temperature?  Does the material become conductive at this temperature?
>
>
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