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Looking for strong thermoset with low CTE

Looking for strong thermoset with low CTE

Looking for strong thermoset with low CTE

(OP)
I am searching for an epoxy resin that has a low coef. of thermal expansion (in the neighborhood of 10 uin/in-degF). Does anyone have recommendations for suppliers, websites, or materials that I can look in to?  Thanks.  

RE: Looking for strong thermoset with low CTE

Kevlar has a negative CTE so if you can use that to reinforce your mix you could have perfect control over the expansion.

Cheers

Greg Locock

RE: Looking for strong thermoset with low CTE

(OP)
Greg (or anyone else),

Do you know of any Kevlar products that can be added to a thermoset epoxy?  Does Kevlar come in forms other than sheets?  I need an additive that can be mixed into an epoxy and not significantly alter the epoxy pour/fill characteristics.  We plan to pour epoxy into a silicon mold, pull a vacuum, and cure it.  A fabric-like kevlar sheet won't work.  

We've tried glass-filled micro bubbles and were able to reduce the CTE from 35 to 25 uin/in-degF.

Thanks,
Scott

RE: Looking for strong thermoset with low CTE

Kevlar comes in a variety of forms, including continuous filament yarn, staple, engineered short fiber, pulp, spun yarn, and woven fabric.  I suggest you investigate further with DuPont:

http://www.dupont.com/kevlar/

Epoxies are frequently formulated with very high levels of inorganic mineral fillers in order to reduce the CTE, especially for encapsulation of microelectronic components.  I cannot recommend any specific grades or manufacturers, but you can perform your own search using the database from COMPOSITES TECHNOLOGY/HIGH PERFORMANCE COMPOSITES magazines:

http://www.compositestech.com/

then click on Sourcebook

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