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Effect of Different Epoxies

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Re: Effect of Different Epoxies

Postby rynhardt » Fri Dec 01, 2017 7:24 am

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Re: Effect of Different Epoxies

Postby Bille » Fri Dec 01, 2017 6:17 pm

tahoedirk wrote:
Thu Nov 30, 2017 8:18 pm
MGS from Germany is by far the best I've used but too expensive. My masts have always been solid carbon/epoxy though
YEP !! :thumb:
But the real reason i use MGS , and Aeropoxy , is because nether brands use MDA
aromatic amines (a known liver toxin and carcinogen) in their hardeners. And also, both satisfy
all structural, pot life and wet-out characteristics according to tests by Rutan Aircraft
Factory, and RAF recommended its use for all homebuilt aircraft applications.

Aeropoxy takes like 4 months @77-f to to full cure , and parts can be handled
about 24-hr after initial cure, and when Ya laminate to that uncured part you still get
a Great molecular as well as a structural bond. Want to finish off the cure ; just
toss it in the oven @ 140-F for 2 hours,(or in my Van for the afternoon, in the Vegas summer sun)
and it's done.

MGS has hardener range of 6-hours, for the slow, and :15-min for the Fast ; they
both can be blended to get any cure time Ya want in-between, because they
both have the same PHR mix-ratio.

I personally can not use West-system slow hardner ; the smell makes me sick , and
i start to get a skin rash.
Most the good brands of epoxy are suitable for what we build as DIY'ers ; some of
those epoxys will kill Ya , faster than others. :o


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Re: Effect of Different Epoxies

Postby tkettlepoint » Sun Dec 17, 2017 10:55 pm

head to head ... RR is soft and flex compared to foresset epoxy that is heat cured.
In the beginning 3 years ago I made some of the prototype foils out of RR more flex and not as strong for sure. Pulled few inserts on the wing mounts out of the fuse. Could bend the wings alittle by hand.

Same lay up with carbon but with forrest epoxy ( heat cured) way way stronger and don't get soft on the beach in the sun. you tap on the parts it sounds like metal almost. I have being using medium Vos but have some high here to which I am going to try. The only draw back is hot coat after if fill pin holes it is a pain in the ass... Got some some clear polyester spot puddy from my local suppler that I get all my paint from and it is the cats meow.


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