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Old Mar 19, 2015, 05:37 PM
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What Epoxy do you use?

So I am looking for a Low Thermal Resistance Epoxy to waterproof from ESC and Receiver Boards. What do you guys use? Let me know! Thanks!
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Old Mar 19, 2015, 10:06 PM
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No body....? At all? Well then how do you waterproof your boards?
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Old Mar 19, 2015, 10:12 PM
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Do a search for "cornformal coating".
Quote:
A*Conformal coating*is a protective chemical*coating*or polymer film 25-75m thick (50m typical) that 'conforms' to the circuit board topology. Its purpose is to protect electronic circuits from harsh environments that may contain moisture and or chemical contaminants.
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Old Mar 19, 2015, 10:45 PM
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Originally Posted by jtroutt19 View Post
So I am looking for a Low Thermal Resistance Epoxy to waterproof from ESC and Receiver Boards. What do you guys use? Let me know! Thanks!
Years ago we had moisture issues with some of our outdoor electronic controls for high voltage circuit breakers. The first solution was to use epoxy over critical areas of those circuit boards.

Only problem was, after a year or so, that epoxy started to allow moisture under it, and after that happened, the board was junk. (Those were $1100 circuit boards)

They went to a specialized encapsulation that covered the circuit board with 3/8 inch thick covering. This was a specialized coating designed for electronic use. This stuff has poor thermal conductivity, and using it on an ESC would cause it to overheat.

DO NOT use the stuff from the local hardware store. If that stuff smells, it's got chemicals that will damage your electronics. We got hit with that years ago, and it resulted in a field recall program. The over the counter stuff that was used by one of our suppliers dissolved the enamel off of some solenoid windings after a year or so.
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Old Mar 20, 2015, 07:14 AM
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No body....? At all? Well then how do you waterproof your boards?
Uhh, I keep mine out of the water.
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Old Mar 20, 2015, 08:48 AM
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When I was manufacturing ESCs (RC-Hydros.com) I used 3M DP-270 to conformal coat the electronics on my products. I also used it to coat my receivers (I always glued the crystal in). Never had any problems.

You can get DP-270 from Newark Electronics, or you can try www.OffshoreElectrics.com in Boston area.

Andy
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Old Mar 20, 2015, 07:34 PM
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Thanks alot Andy I will check them out. I am wanting something that will not degrade over time and also transfers heat really well. I work on electronic devices for a living and I see this stuff that manufactures put on cell phone boards. They use a really thing layer over most of the board and it seems to seal the board up. One reason I believe that water damage treatments work for cell phones is because of this stuff. It is not like regular epoxy in the sense that you can heat it up and remove it. But it is just as hard as epoxy. I believe it also adds shock protection to the PCB as well to keep solder joints from breaking when devices are dropped and such.
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Old Mar 20, 2015, 09:16 PM
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Humiseal 1B31. Any electronics grade silicone. (Do not use normal RTV silicones on electronics.) Corrosion X sprayed on seems to offer some protection - google "Corrosion X ESC" or some of the similar CRC products at a lot of hardware stores.
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Old Mar 20, 2015, 10:32 PM
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Yeah I've looked at the corrosion x. Thing is I want total protection not some! I plan on possible submersion.
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Old Mar 20, 2015, 10:58 PM
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Yeah I've looked at the corrosion x. Thing is I want total protection not some! I plan on possible submersion.
Submersion?

You still have the connectors to worry about. Problem is with total submersion, the DC voltage and currents that exist on the RC equipment will be flowing between the pins of the various connectors.

Not good, since that current will be removing copper and/or plating on the pins of the connectors.

Don't know how much room you have available. Places like Home Depot do sell plastic outdoor electrical boxes with screw on lids that are sealed against the environment with O'Rings and similar.

Or check out www.digikey.com for their sealed boxes.

http://www.digikey.com/product-searc...0&pageSize=100

Or
http://www.digikey.com/product-detai...515-ND/1219176

Or Mouser
http://www.mouser.com/Enclosures/Enc...pe%7c0&FS=True

If you run the various wires through the side of one of these boxes, you can seal it off with some electrical safe sealing compound.

Duct Seal putty is good for that purpose, but it is hard to find.

I think this is the stuff:
http://www.homedepot.com/p/Gardner-B...-110/100212441
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Old Mar 21, 2015, 07:29 AM
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I thought about a enclosure as well the only issue I came up with is cooling. The esc will not be able to cool itself properly. As far as the connections go Heat shrinking and then adding silicon to them has always worked for me well enough.
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Old Mar 21, 2015, 09:14 AM
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...I see this stuff that manufactures put on cell phone boards. They use a really thing layer over most of the board and it seems to seal the board up.
Yup, that's most likely Humiseal, as mentioned earlier. We used that in power supplies at my last job, but not on areas where we were moving heat. It doesn't let the heat out very well.

On my ESCs I only put the DP-270 on the areas where there was power, not on the cooling portions. Those were exposed.

Quote:
It is not like regular epoxy in the sense that you can heat it up and remove it.
DP-270 is like that too. It's a hard finish, but with a soldering iron you can easily remove the compound and retouch the components under it, the put a dab back to cover your work and all is well.

Andy
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Old Mar 21, 2015, 09:02 PM
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You can always enclose the ESC, but cut a hole and put the the ESC's heatsink out the side and then glue the seam so it's sealed. Just a thought. So many ways to (insert inappropriate comment here).
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Old Mar 21, 2015, 10:22 PM
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You can always enclose the ESC, but cut a hole and put the the ESC's heatsink out the side and then glue the seam so it's sealed. Just a thought. So many ways to (insert inappropriate comment here).
Yup

That would work. And, if your ESC gets submerged, you get instant water cooling
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Old Mar 22, 2015, 10:07 AM
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Andy man thanks I have always wondered what that stuff was but I will say this I cannot remove it with a soldering iron. I've tried and it holds fast even at 480 Celsius. As for the instant water cooling that is a fabulous idea! lol. I might actually do that though Easy enough to cut a hole in plastic. I don't know though we will see. Good Idea though!
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