Need Help Sourcing/Selecting Potting Compound for Electronics

How about this?.....Paul

Thanks I'll look into it more but DAP (A great brand) likely makes this as a competitor to the GE Silicon II caulk I already tried (though this is specifically clear but as it turns out the GE stuff I had dries clear). Problem w/ the GE (and I suspect DAP) is that it comes out much too THICK even after heating. I need something with much lower easy flowing (closer to water?) viscosity to fill airpockets before it cures.

Either the DAP or GE goop would be perfect once dried! (if I could get them to fill in the air gaps)

Thanks again

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Way back when, whatever place I was buying this kind of stuff from had two types of such; self-leveling and whatever they called the notselfleveling one. Sounds like you're looking for self-leveling; just like the name suggests, you pour it in wherever and it flows like water before it sets. So it's out there, you just need to find it.

Hysol makes an extensive line of industry standard products for encapsulation and conformal coating.

Google "Hysol"

This link will give you a lot of info, I know it's a strange looking link ... but it will narrow the list down ... they make hundreds of products :

Here is one of many online distributors for Hysol products :

As an afterthought, i offer a few points for consideration :

( 1 ) Encapsulating resins have different temperature coefficents than many electronic components. The resins will expand and contract at a different rate than the electronic components as the temperature changes. This can sometimes cause components such as integrated circuits (IC's) to crack or become damaged. One of many solutions to this problem is to first coat the device ( circuit board & components ) with "Latex Solder Mask". After the Latex dries pour the "Encapsulating Resin" over the device. The Latex will act as a cushion and isolate the circuitry from the ridged resin. The Latex also offers a certain degree of mechanical shock resistance.

Google "Latex Solder Mask"

These guys sell both Resins and Latex :

( 2 ) Non-sealed adjustable and mechanical assemblies such Potentiaometrs and Relays should be sealed to prevent the "Encapsulating Resin" from entering those devices. The "Latex Solder Mask" will solve this type of problem.

( 3 ) Power components such as "Power Transistors" can generate a lot of heat. You may need to mount "heat generating components" on a heat sink and allow the heat sink to protude outside of the "Encapsulating Resin". If you use Latex, make sure none of the components will become so hot as to char the Latex. Charred Latex could become "Electrically Conductive".

!!! CAUTION CAUTION CAUTION !!! If you decide to use "Latex Solder Mask", MAKE SURE THE LATEX IS NON- CONDUCTIVE. Most "Latex Solder Mask" is NON-CONDUCTIVE. Pure "Liquid Latex" is NON-CONDUCTIVE.

Some Latex products ARE CONDUCTIVE though. These products have many uses such as Anti-Static coatings.

Here is an example of "CONDUCTIVE LATEX" ( Don't use anything like this stuff ) :

MAKE SURE ALL OF THE ENCAPSULATION PRODUCTS ARE NON-CONDUCTIVE.

Hope this helps Good Luck :)