Cris,

NO to 1B31!! The Tg is about 15 degrees C and it is easily softened by hydrocarbons.
IB73 is some what better with a Tg around 43 degrees C but it will not with stand exposure to hydrocarbons.
The unit will be exposed "external" environmental conditions besides "dirty" water. The build up of these
contaminants will pose serious issues when combined with moisture.

Either you use Parylene or "seal" the product. Anything else will result in shortened product life.

The question is how long is the warranty period for this product???

David A. Douthit
Manager
LoCan LLC

Chris Almeras wrote:

> Is there any other environmental issues this assembly faces besides the moisture?(I.E. temperature,vibration, etc....) If there are no other concerns, I would consider an acrylic, possibly Humiseal 1B73 or 1B31. We do have an assembly that is encapsulated with Shin-Etsu KE109E. The customer puts it through a test where it has to work while submerged for a certain amount of time during heavy vibration. It is not a real expensive option, but it is not as cheap as the acrylic option.
>
> Chris Almeras
>
> -----Original Message-----
> From: Jorge Santana [mailto:[log in to unmask]]
> Sent: Friday, March 29, 2002 12:06 PM
> To: [log in to unmask]
> Subject: [TN] Underwater application
>
> Hi
>
>    We need found out a way to keep the board working in a underwater
> environment, there is possibilities of occasional flood inside the box
> enclosure and the board has to survive, the water came from rain.
>    Folks from automotive world " under hood applications" have this
> experience since cars are subject to flood also.
>
>   What kind of material is used ? What recommended thickness ?
>
>    We are thinking about RTV Elastomeric Conformal Coating.
>    It is not necessary to say that the solution should be not expensive and
> effective.
>
> Thanks
> Jorge Santana
>
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