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n103md(at)yahoo.com
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 Posted: Mon Jun 18, 2007 5:54 pm Post subject: RTV sealants |
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There were several recent recommendations for the use of
RTV (room temperature vulcanizing) elastic sealants.
Before putting this stuff near your airframe or avionics,
you should know that there are many different types of RTV,
and most of them are somewhat corrosive as a result of the
acetic-acid curing chemistry (smells like vinegar).
For mounting antennas to aluminum airframes, consider using an
alcohol-cure RTV such as clear or gray Dow Corning 3145, white
General Electric RTV 162 or gray high strength RTV 167, or clear
Loctite 5140.
These alcohol-cure RTVs are more expensive.
Instead of a buck or three, McMaster sells the GE 162 for $12.66
per 2.8 oz tube.
http://www.mcmaster.com (part number 74935A65, page 3305)
The Dow 3145 is quite a bit more expensive than that.
references:
http://www.logwell.com/tech/servtips/RTV.html
http://www.mgchemicals.com/downloads/appguide/appguide0205-1.pdf
http://www.mgchemicals.com/products/silicones/cureguide-1part.html
.. and of course Google...
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kayce33(at)embarqmail.com
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| Posted: Tue Jun 19, 2007 10:13 pm Post subject: RTV sealants |
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As far as sealants are concerned, wouldn't shoe goo, Plumbers Goop or RV
Goop from eclectic products work as well? I remember Bob talking about Shoe
Goo and some other similar products. These I believe are all from eclecti
products in LA. I purchased mine at Home Depot...seem to work well.
Harold
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Wed Jun 20, 2007 3:34 am Post subject: RTV sealants |
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While it is important to be aware of the side effects of the acidic acid
cured RTVs on electrical contacts/components and use the neutral cured RTVs,
especially in a confined area, there is no problem using them on the
airframe. (Have you ever used self etching primers on your new winged
creation?) The acetic acid cured RTVs provide a stronger adhesion to the
metal substrate, if that is desirable, without the proper primer which may
be required with the neutral cured RTV's. A strong adhesion is not usually
necessary in an electrical/electronic applications.
Dale Ensing
many years silicone RTV experience with aerospace/aviation industry
| Quote: |
<kayce33(at)embarqmail.com>
As far as sealants are concerned, wouldn't shoe goo, Plumbers Goop or RV
Goop from eclectic products work as well? I remember Bob talking about
Shoe Goo and some other similar products. These I believe are all from
eclecti products in LA. I purchased mine at Home Depot...seem to work
well.
Harold
|
[quote] ---
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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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nuckollsr(at)cox.net
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| Posted: Wed Jun 20, 2007 5:03 am Post subject: RTV sealants |
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At 07:30 AM 6/20/2007 -0400, you wrote:
Good point Dale. With respect to Shoe Goo (E6000) and close cousins. I've
found
that these adhesives have excellent adhesion to clean surfaces and are
relatively
inexpensive and readily available. They do not have the high temperature
operating
characteristics of silicones and I'm not sure what the long term
characteristics
are with respect to ageing and in particular, attacks by the byproducts of
combustion and the inevitable constituents of oil that will end up on the
belly of your airplane.
RTV is not as aggressive as an adhesive and has a lower tensile strength
but it's resistance to evils of the environment and performance at
temperature extremes is inarguable. But if you ever have to open a joint,
it's harder to clean up than E6000 which is easily dissolved with mild
solvents.
In the case of antenna base sealing on the bottom of the aircraft, I
think RTV has "the edge" . . . but it's likely that an E6000 sealing
job will be just fine too.
Bob . . .
[quote]
<densing(at)carolina.rr.com>
While it is important to be aware of the side effects of the acidic acid
cured RTVs on electrical contacts/components and use the neutral cured
RTVs, especially in a confined area, there is no problem using them on the
airframe. (Have you ever used self etching primers on your new winged
creation?) The acetic acid cured RTVs provide a stronger adhesion to the
metal substrate, if that is desirable, without the proper primer which may
be required with the neutral cured RTV's. A strong adhesion is not usually
necessary in an electrical/electronic applications.
Dale Ensing
many years silicone RTV experience with aerospace/aviation industry
>
><kayce33(at)embarqmail.com>
>
>As far as sealants are concerned, wouldn't shoe goo, Plumbers Goop or RV
>Goop from eclectic products work as well? I remember Bob talking about
>Shoe Goo and some other similar products. These I believe are all from
>eclecti products in LA. I purchased mine at Home Depot...seem to work well.
>Harold
>---
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harvey4(at)earthlink.net
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| Posted: Wed Jun 20, 2007 12:00 pm Post subject: RTV sealants |
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Another sealant question;
Does anyone know of a sealant-like product that could be used for the
gap between the canopy and body as a weather seal?
I There are no off-the-shelf weather seals I can find that will fit
exactly. Perhaps there's a liquid sealant that can be extruded into
the gap and will mould to the right shape?
Thanks
Neil
At 01:37 PM 6/19/2007, you wrote:
[quote]
<kayce33(at)embarqmail.com>
As far as sealants are concerned, wouldn't shoe goo, Plumbers Goop
or RV Goop from eclectic products work as well? I remember Bob
talking about Shoe Goo and some other similar products. These I
believe are all from eclecti products in LA. I purchased mine at
Home Depot...seem to work well.
Harold
---
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mprather(at)spro.net
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| Posted: Wed Jun 20, 2007 12:39 pm Post subject: RTV sealants |
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There was an article a while back in Sport Aviation that was written by a
fellow that used automotive urethane windshield adhesive to install the
canopy on his RV-4 (I think)..
As I recall, he used a product like this:
http://www.levineautoparts.com/3murwiad10fl.html
Regards,
Matt-
[quote]
<harvey4(at)earthlink.net>
Another sealant question;
Does anyone know of a sealant-like product that could be used for the
gap between the canopy and body as a weather seal?
I There are no off-the-shelf weather seals I can find that will fit
exactly. Perhaps there's a liquid sealant that can be extruded into
the gap and will mould to the right shape?
Thanks
Neil
At 01:37 PM 6/19/2007, you wrote:
>
><kayce33(at)embarqmail.com>
>
>As far as sealants are concerned, wouldn't shoe goo, Plumbers Goop
>or RV Goop from eclectic products work as well? I remember Bob
>talking about Shoe Goo and some other similar products. These I
>believe are all from eclecti products in LA. I purchased mine at
>Home Depot...seem to work well.
>Harold
>---
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aadamson(at)highrf.com
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| Posted: Wed Jun 20, 2007 1:03 pm Post subject: RTV sealants |
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Lancair sells a "d" seal that would probably work or it looks like you can
get the same stuff from mcmaster carr. Look for silicone seals and you'll
find it, it's 5/8" wide by 3/8" tall and has a flat back. You put in on
with clear silicone. Actually McMaster has tons of that kind of stuff.
Makes good edge protection stuff as well.
Alan
--
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