Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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 Posted: Wed Apr 01, 2009 6:44 pm Post subject: Removing potting compound. |
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On Wed, April 1, 2009 1:58 pm, Av8r3400 wrote:
| Quote: | >From pouring hundreds of gallons of different potting compounds for my work, I can
> attest that more likely any heat or solvent that would soften/remove this compound
> will destroy any electronics contained in it. That is it's primary function,
> protection from contaminates and vibration.
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As I said before, the two methods for removal are heat and solvents. People have been
successful with various concoctions of nasty solvents and some clever ways to induce
them into the tiny air pockets within the potting.
First here's two briefs on a patented potting removal processes:
<http://www.freepatentsonline.com/5879468.html>
<http://www.patentstorm.us/patents/5879468/description.html>
Here's how a clever Aussie got the potting out of a CDI system.
<http://www.rg500.net/HTML/marc02/index.html>
Patience! That appears to be required.
You can get it cold enough to break the brittle potting out or you can use solvent.
These guys even have a link to the solvent they bought and used successfully.
<http://www.pottingsolutions.com/my%20site/Technology/potting_hints.htm#remove%20the%20potting%20material>
But as AV8R3400 said (no apparent name in the posting)
Removing the potting is a tough or nearly impossible job. This guy did enough so he
could simply identify the components and dump the EPROMs then rebuild with new parts.
Good photos and description though. He says: "The chemicals needed to perform epoxy
removal are pretty nasty stuff... things like methylene chloride and perchloroethane,
and formic acid. I did buy some epoxy stripper from McMaster Carr, but I did not use
it here."
<http://www.tripoint.org/kevtris/Projects/votraxpss/unpot.html>
Apparently there are three broad classifications of potting compounds which may all be
thermosetting resins but possibly the polyurethane type is thermoplastic.
1) Silicone
2) Epoxy
3) Polyurethane
As I said before, "Google is your friend"!
<http://preview.tinyurl.com/d4ew8q>
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
Finagle's Second Law:
No matter what the anticipated result, there will always be
someone eager to (a) misinterpret it, (b) fake it, or (c) believe it
happened according to his own pet theory.
hangover, n.:
The wrath of grapes.
"In matters of principle, stand like a rock; in matters of taste, swim with
the current."
-- Thomas Jefferson
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
|
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