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Silicone goo in IR alt.

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Jan 20, 2010 11:06 am Post subject: Silicone goo in IR alt.

When I opened up the regulator of an IR alternator, the circuit board was submerged in a slime of silicone jelly. I blew most of it out with 100 psi air, but how do you get rid of the residue? I tried acetone with no effect. And even though I wiped off the area, I can still feel the slippery effects of the residue everytime I handle that part. I'm concerned about contaminating other parts of my plane and subsequent bonding problems for resin and/or paint.

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retasker(at)optonline.net
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Posted: Wed Jan 20, 2010 12:55 pm Post subject: Silicone goo in IR alt.

Essentially impossible.  All you can do is make sure you do not handle 

the part and then touch anything else that may need paint or resin.



I guess curiosity would prompt me to ask why you removed the silicone 

potting material since it was put there for a purpose?  And why you are 

removing the regulator from an IR alternator in the first place?



If your intention is to replace it with an external regulator, then just 

get rid of the part with the silicone residue on it - problem solved.  

If you plan to repackage the internal regulator externally, then do so 

now - problem solved.



Dick Tasker



jonlaury wrote:

 	  Quote: 	
		   



 When I opened up the regulator of an IR alternator, the circuit board was submerged in a slime of silicone jelly. I blew most of it out with 100 psi air, but how do you get rid of the residue? I tried acetone with no effect. And even though I wiped off the area, I can still feel the slippery effects of the residue everytime I handle that part. I'm concerned about contaminating other parts of my plane and subsequent bonding problems for resin and/or paint.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 82524#282524

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lists(at)stevet.net
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Posted: Wed Jan 20, 2010 12:59 pm Post subject: Silicone goo in IR alt.

Hey, John, how about something like this?:



http://tinyurl.com/yhotqp4

Steve Thomas

________________________________________________________________________





On Jan 20, 2010, at 11:06 AM, jonlaury wrote:



 	  Quote: 	
		   

 

 When I opened up the regulator of an IR alternator, the circuit board was submerged in a slime of silicone jelly. I blew most of it out with 100 psi air, but how do you get rid of the residue? I tried acetone with no effect. And even though I wiped off the area, I can still feel the slippery effects of the residue everytime I handle that part. I'm concerned about contaminating other parts of my plane and subsequent bonding problems for resin and/or paint.

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 20, 2010 2:24 pm Post subject: Silicone goo in IR alt.

At 01:06 PM 1/20/2010, you wrote:

 	  Quote: 	
		  



When I opened up the regulator of an IR alternator, the circuit 

board was submerged in a slime of silicone jelly. I blew most of it 

out with 100 psi air, but how do you get rid of the residue? I tried 

acetone with no effect. And even though I wiped off the area, I can 

still feel the slippery effects of the residue everytime I handle 

that part. I'm concerned about contaminating other parts of my plane 

and subsequent bonding problems for resin and/or paint.


	


    That's a tough job . . . I think we had some

    super-solvents at HBC that would cut silicon

    oils. I'm going to be out there tomorrow close

    to the processes lab . . . I'll drop in and

    ask.



    Bob . . .

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Jan 20, 2010 6:13 pm Post subject: Re: Silicone goo in IR alt.

Dick,



Thanks for your thoughts. 

I opened up the IR to cut all the circuits of the board away from external terminals so that I could convert it to a ER alternator. I'll have to look at how I might do the conversion without the OE plug and mounting points. 



I was following instructions for the conversion from an article that appeared in the Experimenter. The alternator in the pictures had an epoxy potted board instead of this nasty silicone surprise



John.

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Jan 20, 2010 6:21 pm Post subject: Re: Silicone goo in IR alt.

Steve, 

Thanks for that. The data sheet says it gets rid of silicone oils so should do the trick. Now the trick is to find it.javascript:emoticon('')



John

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Wed Jan 20, 2010 6:34 pm Post subject: Silicone goo in IR alt.

Jon;  

   

Possibly the last item on this page?? http://tinyurl.com/yjjtwus Silicone is resistant to most solvents. Another possibility is silicone polish remover, available from auto paint shop wholesalers.   

   

Bob McC  

   

[b]> --

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Bob McC
Falco #908
(just starting)

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Jan 20, 2010 7:00 pm Post subject: Re: Silicone goo in IR alt.

Bob McC



The PolySi product looks like it would do the job, but one gal. smallest size is a bit more than I need.



The 3M Novec Degreaser product is available (who'd athunk) from Aircraft Spruce! in 12 oz aerosol, $19, and  I have to place an order there soon.



Thanks for the thought,

John

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Wed Jan 20, 2010 7:30 pm Post subject: Silicone goo in IR alt.

John;



The link I sent says it's available also in pints and quarts, but if you've

found something at "Spruce" and you're placing an order anyway, then that's

the way to go.



Bob McC



[quote] --

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Falco #908
(just starting)

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