Steve: The real advantage of the silicone over the urethane is it's
temperature resistance(200C) and stability of electrical properties at
elevated temperatures. If you don't need this use the urethane.


Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076



-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, September 04, 2003 12:35 PM
To: [log in to unmask]
Subject: [TN] Silicone conformal coating


Hi All!

I know when you look up properties for Silicone conformal coating, it
usually states that it has good moisture resistance, but is it really that
good?

I've heard that it is somewhat permeable to moisture, that if you were
worried about moisture, and the assembly were going to see the outside
environment, you would be better off with an acrylic, or urethane coating.

Any thoughts?

Thanks!

-Steve Gregory- ---------------------------------------------------
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