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  #1  
Old 05-09-2011, 02:12 AM
JurgenRoeland JurgenRoeland is offline
 
Join Date: Oct 2010
Location: Belgium, Geraardsbergen
Posts: 120
Default 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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  #2  
Old 05-09-2011, 05:28 AM
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mototopo mototopo is offline
 
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Location: Italy
Posts: 203
Default

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.
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Was Avellino - Italy...
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  #3  
Old 05-09-2011, 06:18 AM
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shuttle shuttle is offline
 
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Location: UK
Posts: 368
Default

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
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  #4  
Old 05-09-2011, 07:10 AM
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GusBiz GusBiz is offline
 
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Location: Melbourne, Victoria, Australia
Posts: 211
Default 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.
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  #5  
Old 05-09-2011, 08:31 AM
JurgenRoeland JurgenRoeland is offline
 
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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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  #6  
Old 05-09-2011, 08:45 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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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
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  #7  
Old 05-09-2011, 12:48 PM
Charles in SC Charles in SC is offline
 
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Posts: 703
Default

Quote:
Originally Posted by JurgenRoeland View Post
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
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.
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  #8  
Old 05-09-2011, 01:07 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default 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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  #9  
Old 05-09-2011, 01:54 PM
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Rick_A Rick_A is offline
 
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Location: Highland Village, TX
Posts: 1,520
Default

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
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  #10  
Old 05-09-2011, 03:13 PM
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caryr caryr is offline
 
Join Date: Jan 2005
Location: northwest georgia
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Default

http://www.permatex.com/products/aut...sket_Maker.htm


this is good and very common in US
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