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Elevated Temperature Epoxy

Elevated Temperature Epoxy

Elevated Temperature Epoxy

(OP)
Hello Everyone,

I am looking for a room temperature curing epoxy that will not degrade in the 160 to 220 deg F temperature range.  Something in a colorless epoxy with a viscosity less than 700 for RTM.  I have been using several of the 2:1 epoxies and they have been working well for other projects, but I now have a project that the part may be exposed to direct sun and reach temps above 160 F.  My initial tests showed that the 2:1 gets soft and also shows fabric break through. I have tried post cure at 140 F and adding UV safe clear coat, but the test parts still degrade.   Are vinyl esters or polyester resins the only solution? Any thoughts?

Thanks.

Mike

RE: Elevated Temperature Epoxy

Check out Hysol's selector guide for the aerospace industry here:

http://www.henkel.com/SID-54DB71D9-0075C5FF/cps/rde/xchg/henkel_com/hs.xsl/downloads-21476.htm?iname=Electronics&;countryCode=com&;BU=industrial&parentredDotUID=0000000H0K&redDotUID=00000002KJ

EA9396 is good to 350° with good properties.  I'm not sure what the viscosity is, but it calls it low viscosity.

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.

RE: Elevated Temperature Epoxy

Kirby's suggested EA9396 is fairly thin (a bit thinner than honey if I recall correctly).  For high temps I like the Hysol pastes instead.  EA934.NA may be expensive, but the performance is excellent even when it's hot.  Did some pull-tests straight out of an oven and it emerged the winner.  

I also tried a Loctite H8000 which resisted heat very well.  It's "methactrylate", and when mixed 10:1 it has a consistency like toothphaste.  Applying it is tricky but once cured the bond was good.

Steven Fahey, CET

RE: Elevated Temperature Epoxy

Any resin will degrade when exposed to UV. Gel coat will help as will UV inhibitor. Vinyl ester can handle temp to 300F and 350 cps.

Epicure 3218 is a pretty good room temp curing agent used with Bis A epoxy. Believe with heloxy modifiers can reduce the viscosity where you want it.  

RE: Elevated Temperature Epoxy

(OP)
Thank you to each of you for your suggestions.  I was hoping to not have to work with a polyester or vinyl ester due to the color, the styrene smell, and the mekp catalyst. I am doing infusion so viscosity is a concern. I have been searching for a solution for about 6 months. This week I was able to reach
technical reps from huntsman and cook. They have both suggested examples to try.  I should have results in about 3 weeks that I will post.

Mike

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