VAF Forums

VAF Forums (http://www.vansairforce.com/community/index.php)
-   RV-8/8A (http://www.vansairforce.com/community/forumdisplay.php?f=6)
-   -   RTV (http://www.vansairforce.com/community/showthread.php?t=100887)

SHF 06-16-2013 07:32 AM

RTV
 
The "riviting the rudder" instructions call for a daub of RTV. Some web searching learns that this is a brand name silicone adhesive, not sold in my part of the world. Looking for a replacement can I use any silicone adhesive or should it particularly be a gasket sealant, or something else for that matter.

Can anybody advise please?

thanks Roger.

Mel 06-16-2013 07:51 AM

A silicon adhesive is fine. Just be sure that it is marked "safe for aluminum".
Many silicon adhesives contain acetic acid that contributes to corrosion.

Bob Axsom 06-16-2013 09:01 AM

Room Temperature Vulcanizing
 
I use a lot of Dow 736 (red) in the high temperature areas and Dow 732 (black) in other areas on my dark blue airplane. Comes in a tube with a seal in the end that has to be broken and has a separate plastic cone that can be cut to different lengths for controlling the size of the opening. It has very good adhesion and "rubber" qualities when cured (24hrs full cure - skins in minutes). Can be used to: stabilize wire routing through a hole in metal, make flow fillets, etc. When I am making gap seals on parts like strut cuffs that are going to be removed a lot and I don't need the strength of the expensive Dow products I buy some similar "rubber in a tube" from an auto parts store. Great stuff.

Bob Axsom

Rick_A 06-16-2013 09:22 AM

Look for "Sensor Safe"
 
If you go the an auto parts store and don't find a silicone sealant labeled "safe for aluminum", look for one labeled as "Sensor Safe". These are the one that don't have acetic acid in them.

David Paule 06-16-2013 10:48 AM

The one I used was Permatex Ultra Blue, 81724 (77B). It's marked "sensor-safe RTV gasket maker."

The first auto-parts place I stopped at had it.

Dave

Karsten 06-16-2013 01:07 PM

In the Netherlands and in Germany you could use Sicaflex-521 UV!
It is ok for aluminum.

Karsten

Walt 06-16-2013 04:53 PM

Or good ole pro-seal.

jckonekamp 01-31-2017 12:22 PM

RTV Substitute - UPDATE
 
Here in Argentina I've found a great substitute from SIKA. Is almost the same (or the same) as the Sikaflex 521 UV. It's called Sikabond AT-Metal, and made in Switzerland. It's a grey hybrid polyurethane silicone, non aggressive to aluminum.
I had some RTV left from a previous plane that I decided not to use because it has been opened last year.
Here are the pictures. Hope it helps.










maniago 08-28-2017 09:05 AM

Quote:

Originally Posted by Mel (Post 779914)
A silicon adhesive is fine. Just be sure that it is marked "safe for aluminum".
Many silicon adhesives contain acetic acid that contributes to corrosion.

Well, this is painting with too broad a brush really. Gotta do the homework. Dow 732 is acetic acid cure, but is used on AL airplanes, is MIL spec and Boeing compliant.

http://www.sealantengineering.com/ca...79/7905593.htm

az_gila 08-28-2017 12:33 PM

Note that RTV is not a trade name it's a shortened description of "Room Temperature Vulcanizing" rubber.

Perhaps something got lost in the translation to EU languages?


All times are GMT -6. The time now is 06:24 AM.