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08-27-2017, 09:24 PM
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Join Date: Jul 2014
Location: Madison, WI
Posts: 685
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Blue RTV around baffles?
Yeah I know, wtf is wrong with me... I'm wondering your thoughts on using blue RTV instead of red around my baffle/engine. The engine is blue, the baffles are silver, and the silicone baffle material is blue. You can see how blue would look nicer here.
Per their website, the blue RTV is good up to 500deg:
https://www.permatex.com/products/ga...-gasket-maker/
Would that be ok on the top side of the engine?
Or if 400deg is no good, thoughts on one of the gray options?
https://www.permatex.com/products/ga...-gasket-maker/
or 3m Fire barrier?
__________________
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RV-9A - started 01/2015, completed 07/19/2018, 500hrs 03/14/2020
RV-10 - started 04/2020
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08-27-2017, 11:33 PM
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Join Date: Mar 2007
Location: WARNER ROBINS, GA
Posts: 391
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DOW 732 ??
Some time ago someone did a comparison on VAF of several different RTVs for baffle seal. Try a search. One of the better ones was DOW732 clear. So That's what I ended up using on my blue motor.
__________________
Keith
RV 7A RV #9700 May 2017
N325KS the Flying “K”
Built in SoCal KCCB, now in GA @ KPXE
550+ Hours & 7X cross the USA
OSH flyin 2018 & 2019 & Petit Jean 2019
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08-27-2017, 11:38 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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One issue may be that products called "gasket maker" are only designed for thin applications and not as a gap filler, which might be needed in various baffle location.
__________________
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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08-28-2017, 08:04 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Buy a tube and do some tests until you're satisfied or not. For example, clean a spot on the exhaust port of your car's cylinder head and run a bead, check it in a few weeks.
Datasheet:
https://www.permatex.com/wp-content/.../tds/80022.pdf
FWIW, I've found Loctite 598 black sealant to be nearly unbeatable for baffle sealing. The exact same product is also marketed as Permatex Ultra Black.
https://tds.us.henkel.com/NA/UT/HNAUTTDS.nsf/web/A2965F05FAE81B71882571870000D84B/$File/SI%20598-EN.pdf
https://www.permatex.com/wp-content/.../tds/82180.pdf
Datasheet comparison says the blue exhibits about 25% less tensile strength, and the temperature rating is marginal for cylinder heads. Same gap fill rating.
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Dan Horton
RV-8 SS
Barrett IO-390
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08-28-2017, 10:30 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Ditto on above, I used Ultra Black on mine, no problems.
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7A Slider, EFII Angle 360, CS, SJ.
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08-28-2017, 01:53 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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I used the ultra gray to match colors. It is 400F continuous duty - that is the temperature that paint will darken and come off. I figure it is good.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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08-28-2017, 06:14 PM
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Join Date: Mar 2009
Location: Arvada, CO
Posts: 118
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I used blue on my blue engine, all around. 200 hours and no problem.
Jim
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Jimzims
2015 RV7 I0-360 FP
Dues gladly paid, 2020
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08-28-2017, 08:34 PM
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Join Date: Jul 2014
Location: Madison, WI
Posts: 685
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As a side, I checked with Van's and they are OK with using the blue RTV for baffles.
__________________
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RV-9A - started 01/2015, completed 07/19/2018, 500hrs 03/14/2020
RV-10 - started 04/2020
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08-29-2017, 12:21 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by pilotkms
Some time ago someone did a comparison on VAF of several different RTVs for baffle seal. Try a search. One of the better ones was DOW732 clear. So That's what I ended up using on my blue motor.
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Be careful with application......
Compatibility
DOW CORNING 732 Multi-Purpose
Sealant releases a small amount of
acetic acid during cure. This may
cause corrosion on some metallic
parts or substrates, especially in direct
contact or when the cure is carried out
in a totally enclosed configuration
which would not allow cure by-
products to escape.
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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