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  #1  
Old 03-16-2021, 12:42 PM
Av8torTom's Avatar
Av8torTom Av8torTom is offline
 
Join Date: Nov 2009
Location: Yardley, PA
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Default Epoxy Temp Rating

Hi, I'm fabricating a plenum for my 9A.
Can I use West System 205 resin, or do I need to go with a higher temp rating resin?

Thanks,

Tom
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  #2  
Old 03-16-2021, 02:41 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Av8torTom View Post
Hi, I'm fabricating a plenum for my 9A.
Can I use West System 205 resin, or do I need to go with a higher temp rating resin?
West 105/206 has a relatively low Tg (glass transition temperature), the point at which the solid resin starts acting like rubber. Doesn't mean you can't use it. Just don't expect the part to be stiff at elevated temperature. Not all parts need to be real stiff.

Alternatives? Resin Services HTR-212/386-99 (available from Spruce) lists a very high Tg, too high really, and the person who responds to email avoids specific questions. I've built some parts with it, but I'm not buying any more.

Steve Smith has suggested MGS 285/287 as a reliable choice with a decent Tg, and they publish good info: https://www.aircraftspruce.com/catal...s/mgsresin.php
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  #3  
Old 03-16-2021, 03:21 PM
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Av8torTom Av8torTom is offline
 
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Thanks Dan - very helpful

Any ideas what the temp under a plenum might reach? On the ground?, in flight? After shutdown?
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RV-9A (empennage completed, both wings completed, fuselage and finish kit completed, engine hung, working on panel and wiring)
N677AT reserved
Superior XP O-320, 160HP
Picture log: http://s271.photobucket.com/albums/j...8tor215/RV-9A/
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  #4  
Old 03-16-2021, 03:29 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Av8torTom View Post
Thanks Dan - very helpful

Any ideas what the temp under a plenum might reach? On the ground?, in flight? After shutdown?
OAT plus a few degrees in flight.

Air temp at 220F is possible after shutdown on a hot day...but there is no structural load then. I think a plenum lid would cool very quickly as structural load resumed, post takeoff.
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