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03-24-2015, 04:16 PM
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Join Date: Nov 2008
Location: KY
Posts: 102
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Silicone recommendation
I'm at the stage of preparing the elevator pitch trim harness. The instructions have you apply silicone to one end of the harness. I have no experience with this type of work and I'm wondering what type of silicone to use......which makes me wonder if there is more than one type of silicone. What have you other 14 builders been using here. Thanks,

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Greg
RV-14A Fuselage Complete.
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03-24-2015, 04:52 PM
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Join Date: Jul 2005
Posts: 1,346
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Momentive RTV 162 or RTV 6708 are good choices.
You want an electronics grade, not acidic cure bathroom type sealant.
At least that would be my advice. If in doubt, call Van's.
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
Last edited by fl-mike : 03-24-2015 at 04:59 PM.
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03-24-2015, 07:39 PM
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Join Date: May 2014
Location: Savannah
Posts: 806
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RTV 3145 is ideal for this application. There are many other types that will work as well.
http://www.stanleysupplyservices.com...tube/p/162-815
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Mike Hammond
A&P IA PPL ASEL
RV-14A kit S/N 140170
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03-24-2015, 07:56 PM
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Join Date: Nov 2008
Location: KY
Posts: 102
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Thanks
Thanks Guys.
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Greg
RV-14A Fuselage Complete.
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03-25-2015, 04:41 PM
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Join Date: Oct 2013
Location: West Chester, OH
Posts: 24
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Quote:
Originally Posted by fl-mike
You want an electronics grade, not acidic cure bathroom type sealant.
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Alright, so I used GE Premium clear silicone from Home Depot. The plans don't specify anything specific. So I don't see where it would make a difference.
#140100
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03-25-2015, 07:44 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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alternative to Molex
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Last edited by Steve Melton : 03-25-2015 at 08:05 PM.
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03-25-2015, 08:34 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,507
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Quote:
Originally Posted by bschweinberg
Alright, so I used GE Premium clear silicone from Home Depot. The plans don't specify anything specific. So I don't see where it would make a difference.
#140100
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I made a living around electronics and know the difference between the different silicone that is available.
I, like you, used the CHEAP $3 stuff sold at Home Depot, Lowes, and Pep Boys to use on a Circuit Board to stabilize some capacitors. I did not want to buy the $30 stuff. That was over 18-years ago and the unit is still flying.
The link in this thread is the correct stuff to use but some of us CHEAP guys have used the other stuff that is available locally.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-25-2015, 10:03 PM
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Join Date: Jul 2005
Posts: 1,346
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Quote:
Originally Posted by bschweinberg
Alright, so I used GE Premium clear silicone from Home Depot. The plans don't specify anything specific. So I don't see where it would make a difference.
#140100
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for your bedtime reading:
http://www.academia.edu/1902960/Coat...bility_testing
page 120:
>>snip
"An originally introduced moisture-cured resin, in which the hydroxyl group was converted to acetoxy, is now seldom used for electronic applications because of the many failures caused by the release of corrosive acetic acid as the by-product. The released acetic acid corroded thin-film metallizations and chromium and cadmium plated parts, especially when confined in a sealed enclosure."
>>>
page 127:
(an interesting property (mildew under the shower caulk anyone?))
>>snip
"Other Properties.
Because of their low surface tension due to hydrocarbon groups appended to the silicon atoms, silicones have low water absorptions and repel water and, as such, are widely used as water repellents in many military and commercial applications. Paradoxically, in spite of their low water absorptions and water repellent properties, silicones have high moisture vapor transmission rates."
>>>
However, I doubt you'll fall out of the sky...well, before that anodized spar cracks or the knife-edge countersinks cause the tanks to fall off... 
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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03-26-2015, 05:53 AM
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Join Date: Oct 2013
Location: West Chester, OH
Posts: 24
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Quote:
Originally Posted by fl-mike
... now seldom used for electronic applications because of the many failures caused by the release of corrosive acetic acid as the by-product
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I'm just saying that if it was that important then Van's would have identified a specific silicone to use, or put something in the plans like "use electronics grade or aviation grade or mil-spec silicone of the non-acidic variety"
Because they didn't, I take it to mean it's up to the builder to use any silicone they want to seal that connection hanging on the outside of the airplane. It never occurred to me to look for anything other than what the local hardware store sells.
But.......now that there's a few recommendations, I made a note to consider them to seal any other electrical connections that come up during the build.
#140100
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03-26-2015, 09:52 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by bschweinberg
Alright, so I used GE Premium clear silicone from Home Depot. The plans don't specify anything specific. So I don't see where it would make a difference.
#140100
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The Home Depot stuff has a Reactivity of 0.
http://www.homedepot.com/catalog/pdf...3eb60ad111.pdf
Should be good to go.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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