Steve,

Silicone is reasonably resistant to liquid water but it is very
permeable
when exposed to water vapor and certain reactive gases, such as H2S.

David A. Douthit
Manager
LoCan LLC

Steve Gregory wrote:

> 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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