Aeromarine Epoxies

Has anyone on the list used Aeromarine brand epoxies?

They are available at http://www.jgreer.com

I seek feedback from users.

Fly right.

Earlier, (Nicholas Cafarelli) wrote:

Has anyone on the list used Aeromarine brand epoxies?

They are available at http://www.jgreer.com

I seek feedback from users.

Off topic, since I haven't used that brand:

When it comes to low-cost general-purpose epoxies, I prefer the 635
system from US Composites (http://www.uscomposites.com) with 3:1
medium hardener.

In the 2.66-gallon kit, it costs about $30 per gallon (about the same
as polyester resin at the hardware store), has a nice 3-hour working
time for thick layups, and I've had good consistent cure from it.

However, I cannot attest to the strength or other properties of these
materials. I've been using it only for tooling parts, so I don't
consider it of great importance at this time. I'd want to do a coupon
tests before I used it for any sort of flight or structural article.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com

(Bob Kuykendall) wrote in
om:

Earlier, (Nicholas Cafarelli) wrote:

Has anyone on the list used Aeromarine brand epoxies?

They are available at http://www.jgreer.com

I seek feedback from users.

Off topic, since I haven't used that brand:

When it comes to low-cost general-purpose epoxies, I prefer the 635
system from US Composites (http://www.uscomposites.com) with 3:1
medium hardener.

In the 2.66-gallon kit, it costs about $30 per gallon (about the same
as polyester resin at the hardware store), has a nice 3-hour working
time for thick layups, and I've had good consistent cure from it.

However, I cannot attest to the strength or other properties of these
materials. I've been using it only for tooling parts, so I don't
consider it of great importance at this time. I'd want to do a coupon
tests before I used it for any sort of flight or structural article.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com


I have not started building my plane yet... haven't even settled on a
WHICH plane... but I have used US Composits epoxy to build a canoe from
scratch and can attest to it's properties. It appears to me to have
every bit of the strength of West systems epoxy for about half the
price. The only downside is the shop really needs to be at least 80 -90
degrees for it to cure in a reasonable time. I live in south Texas, so
that's really not a big issue for me. I have no idea about heat curing
etc as I've read needs to be done for aircraft layups, but the guy in
florida who markets this stuff seem very knowledgable on the phone.
Their URL is http://www.uscomposites.com/.

I would be curious to know what is special about "airplane" epoxy vs
West system or East system etc... or is that another on of those things
that they make for airplanes and triple the price??


--
ET


"A common mistake people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools."---- Douglas Adams

On 09 Dec 2003 04:58 AM, ET posted the following:
(Bob Kuykendall) wrote in
om:

When it comes to low-cost general-purpose epoxies, I prefer the 635
system from US Composites (http://www.uscomposites.com) with 3:1
medium hardener.

I have not started building my plane yet... haven't even settled on a
WHICH plane... but I have used US Composits epoxy to build a canoe
from scratch and can attest to it's properties. It appears to me to
have every bit of the strength of West systems epoxy for about half
the price. The only downside is the shop really needs to be at least
80 -90 degrees for it to cure in a reasonable time.

A few years ago I built a sailboat and a canoe using Raka epoxy, and I
was pleased with it. One thing I liked was the ability to mix the fast
and slow hardeners to get exactly the cure speed I wanted, which helped
a lot in getting the stuff to cur ein Alaska.

http://www.raka.com/

----------------------------------------------------
Del Rawlins-
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/

Thanks Bob. Useful info. I look forward to reading about any future
coupon testing you end up doing on your informative website.

I have inquired about samples from http://www.jgreer.com and intend to
do testing. It sounds like testing of US Composites 635 resin system
would make a useful comparison.

One main factor is temperature tolerance.
For example AeroPoxy has nearly 200F tolerance
before it gets soft. For a boat, high temperature is not
critical. But for a plane, the built up heat inside
can result in structural weakness.

----------------------------------------------------
Paul Lee, SQ2000 canard project: www.abri.com/sq2000

ET wrote in message .. .
.....
I would be curious to know what is special about "airplane" epoxy vs
West system or East system etc... or is that another on of those things
that they make for airplanes and triple the price??

(Nicholas Cafarelli) wrote in message . com...
Has anyone on the list used Aeromarine brand epoxies?

They are available at http://www.jgreer.com

I seek feedback from users.

Not a user, but I will say that it sort of bothers me that most of the
discount epoxy suppliers don't provide any mechanical properties on
their web sites. Tensile strength, toughness, Young's Modulus, and
glass transition temperature are the minimum I would like to see.

As an example, WEST system is great for it's intended purpose (coating
wood), but it cures to a fairly low stiffness, even though it's
tensile strength looks OK. The same part built with WEST will deflect
at a given load a LOT more than a part with the same glass content
molded with AeroPoxy, or even dime store polyester!

Notice that the Gougeon Brothers have a different system they
advertise for composites...if you are building a composite airplane,
don't use WEST for structural layups, or anything that advertises as
"As Good As WEST".

You pays your money, you takes your chances, but without the
mechanicals, you take MORE chances. More than I care to make.

(Ryan Young) wrote in
om:

(Nicholas Cafarelli) wrote in message
. com...
Has anyone on the list used Aeromarine brand epoxies?

They are available at http://www.jgreer.com

I seek feedback from users.

Not a user, but I will say that it sort of bothers me that most of the
discount epoxy suppliers don't provide any mechanical properties on
their web sites. Tensile strength, toughness, Young's Modulus, and
glass transition temperature are the minimum I would like to see.

As an example, WEST system is great for it's intended purpose (coating
wood), but it cures to a fairly low stiffness, even though it's
tensile strength looks OK. The same part built with WEST will deflect
at a given load a LOT more than a part with the same glass content
molded with AeroPoxy, or even dime store polyester!

Notice that the Gougeon Brothers have a different system they
advertise for composites...if you are building a composite airplane,
don't use WEST for structural layups, or anything that advertises as
"As Good As WEST".

You pays your money, you takes your chances, but without the
mechanicals, you take MORE chances. More than I care to make.


After the post above having to do with heat tollerace, I went to the US
composites website to look for their spec sheet.... no luck.... I am
leaning toward an alum plane anyway.... but I may call them and/or do
some tests if it comes time to make a custome tip or cowl...



--
ET


"A common mistake people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools."---- Douglas Adams

While I have emailed both jgreer.com and uscomposites.com I have yet
to hear back. I continue to await engineering data, if indeed it is
available.

I wonder if the properties of their materials vary because of constant
slight changes in formulation. This might be possible if they are
changing resins, buying from the lowest bidder.

I was hoping someone experienced with the industry might see this
thread.

nc

Earlier, (Nicholas Cafarelli) wrote:

I was hoping someone experienced with the industry might see this
thread.

The guy you really want to talk to about epoxies is George Applebay in
Moriarty, NM, but I don't think he posts to RAH. He knows how modern
epoxies are formulated, and he's got a hatful of recipes for various
epoxies he makes from bulk stocks.

Bob K.