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Home > Forums > Materials Engineers > Materials > Composite engineering Forum

Kevlar decomposition temperaure (2)

Read More Threads Like This One

SAK123 (Structural)

6 Jan 12 22:48

I read that Kevlar degrades at about 800 deg F. This info is all over the www.

What I need to know is as the temperature approaches the 800 deg F limit, does the Kevlar change strength / tensile properties ?

If I expose Kevlar to 700 deg F for 10 min and then quickly return it to room temperature (with 3 min.), will that cause a decrease in tensile capacity ?

Thanks for any input !

(2) berkshire (Aeronautics)

6 Jan 12 23:07

SAK 123.
This is the Dupont handbook on Kevlar which you can find by Googling.
Check page 11-8

B.E.

http://www2.dupont.com/Kevlar/en_US/assets/downloads/KEVLAR_Technical_Guide.pdf

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor

blaxabbath (Civil/Environmental)

16 Jun 12 12:23

With consideration for your system, I would study the glass transition temperature (Tg) of the epoxy you are using. When the epoxy softens, the integrity of the strength provided by the kevlar fabric (I am assuming you are using fabric here) is temporarily compromised (permanently if, when the temp is removed, the critical bond and alignment is not achieved).

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