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05-09-2011, 02:12 AM
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Join Date: Oct 2010
Location: Belgium, Geraardsbergen
Posts: 120
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RTV
Hi guys,
I have a very idiot question.
Being non US citizen and non native english speaker, I'm kind of confused what you guys refer to as RTV sealant. (the stuff you put on the end of the stiffeners to avoid cracks.
I understood this is a kind of silicone that hardens with exposure to air. The only problem is, there are 100s of types you can buy of this stuff. In Europe we also have this to seal bathroom sinks etc...
I looked on lowes website to have the US equivalent and found this : http://www.lowes.com/pd_219849-68-18...ant%26page%3D6
Can somebody confirm that this is the stuff to get. Or post me another link at lowes or homedepot which one to get.
Thanks in advance
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05-09-2011, 05:28 AM
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Join Date: Dec 2006
Location: Italy
Posts: 203
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Hi Jurgen,
had the same problem here in Italy.
RTV stands for "Room Temperature Vulcanizing", it's a kind of rubber material that hardens without heat.
It's usualy availble at industrial supply shops (try a search on rscomponents.com). Check for compatibility with aluminium, some of them may cause corrosion and, if possible, avoid silicone based products (silicone contaminated surfaces will be hard to paint).
I don't have on hand what I used, but I bought it from rs-componets.. a little expensive, but it usually stocks those hard to find items.
__________________
Claudio
Was Avellino - Italy...
Now Cypress, TX
www.rv7a.it
RV-7 I-KLAU (Reserved)
Empennage Done!! (except fiberglass)
Wings done!!
Working on aft fuse.
...SOLD! 
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05-09-2011, 06:18 AM
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Join Date: Dec 2006
Location: UK
Posts: 368
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If you cannot source any locally then there is a specialist aviation outfit in the UK that supplies many items of use for a/c builders.
LAS Aerospace in Okehampton, Devon, UK
Here is a link to their Sealants and Adhesives section: http://www.lasaero.com/site/products...y?id=B02XV0WWL
__________________
Steve Hutt
West Sussex, UK
RV-7 G-HUTY (not flying yet)
( Tip-UP / TMX-IO-360-M1B / Hartzell 7497-2 / 1x LSE PLASMA III / Dual AF4500's / AF-Pilot AP / 695 )
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05-09-2011, 07:10 AM
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Join Date: Apr 2011
Location: Melbourne, Victoria, Australia
Posts: 211
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General interest
Vulcanising usually refers to Sulpher cross linking of Rubber. Its what makes car tyres so durable. Then you have acid resistant Vulcanising which is nitrile rubber, that is obviously with NO instead of Sulpher. Silicon cross links with a dehydration reaction that means that acetic acid is produced when it cross links. Hence why you can smell vinegar sometimes as it drys. All three are very different and will have different responses to heat, flexibility and more to the point oxidation from Ozone ( O3 ) believe it or not. It ends up cracking over time and it oxidises. Oxidation breaks down those cross links.
Not that you really care but just to let you know. The side effect of being a chemist in a previous life.
__________________
Gus Bisbal
RV7
Obsession only exists when someone else isn't doing it too.
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05-09-2011, 08:31 AM
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Join Date: Oct 2010
Location: Belgium, Geraardsbergen
Posts: 120
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Does somebody know the product number how you get this at lowes or homedepot ? I am fortunate that a collegue of mine is going to the US next week and can bring some stuff. Just need to know what to get.
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05-09-2011, 08:45 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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I use RTV 3145, MUCH better than anything you can get at HomeDepot! No acid, long shelf life, does not dry out in the nozzle which makes it easy to use.
http://www.aircraftspruce.com/catalo...ingRTV3145.php
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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05-09-2011, 12:48 PM
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Join Date: Aug 2006
Posts: 703
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Quote:
Originally Posted by JurgenRoeland
Hi guys,
I have a very idiot question.
Being non US citizen and non native english speaker, I'm kind of confused what you guys refer to as RTV sealant. (the stuff you put on the end of the stiffeners to avoid cracks.
I understood this is a kind of silicone that hardens with exposure to air. The only problem is, there are 100s of types you can buy of this stuff. In Europe we also have this to seal bathroom sinks etc...
I looked on lowes website to have the US equivalent and found this : http://www.lowes.com/pd_219849-68-18...ant%26page%3D6
Can somebody confirm that this is the stuff to get. Or post me another link at lowes or homedepot which one to get.
Thanks in advance
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No, that is not what you want. In my area I get RTV from auto parts store. They generally have 2 brands one name brand and one clone brand. It will be sold in different colors which are intended to make it easy to identify the type. They have various temp ratings and such. It is sold for gasket work in automotive repair. I tend to like the "black" stuff. I see brands like Dow, Mr Gasket, NAPA. I hope this helps.
__________________
RV 7
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05-09-2011, 01:07 PM
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Join Date: Mar 2005
Posts: 5,685
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For high temp I use DOW #736 from Aircraft Spruce
I always use Dow #736 for high temperature applications. Copied from Aircraft Spruce on line ( www.aircraftspruce.com):
#736 High Temp. (to 500?F) Red RTV, 3 Oz. Tube
P/N 09-27900
$10.95
Bob Axsom
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05-09-2011, 01:54 PM
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Join Date: Oct 2005
Location: Highland Village, TX
Posts: 1,520
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I used a lot of the Dow 3145 that Walt recommended. I got some from Walt's "expired surplus" supply and I bought some more expired 3145 on Ebay.
I also used the copper colored, High Temp Sensor Safe stuff found at auto supply places FWF. The sensor safe type is non-acidic
__________________
Rick Aronow,
A&P
Flying 7A Slider;
RV-12 SOLD
Jacksonville, FL
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05-09-2011, 03:13 PM
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Join Date: Jan 2005
Location: northwest georgia
Posts: 315
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__________________
Cary Rhodes
Taylorsville, Georgia
N203CR
Van's RV-7
First Flight April 2004
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