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pwmac(at)sisna.com
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Posted: Mon Aug 04, 2008 5:34 am Post subject: epoxys

Correct. For structural purpose the strongest additives would be 

chopped or strands of  Fiberglas then cotton flox. Much of the other 

fillers are just thickeners and definitely weaken the resin.The 

question is do you want to use epoxy resin for structural purposes?. 

Its pretty substandard for anything structural.

In the case of our rib to spar epoxy joint the epoxy just holds the 

rib in place. Works fine if one uses a generous filet. That is not a 

good place for a small amount of epoxy. At that location plain powder 

filler or beads work just fine. Just use a syringe and a caulking 

gun, then use a pop stick to reach the places where the caulk gun 

does not reach.



Lots of good books out there to get up to speed on the use of epoxy 

and Fiberglas composites.

Paul

===========

At 06:00 AM 8/4/2008, you wrote:

[quote]



as i understand it glass beads are not just like flox. beads are 

used to stiffen the mix , say to use as filler, but they weaken the 

mix and should not be used in a structural application.  bob noffs

---

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Mon Aug 04, 2008 5:49 am Post subject: Re: epoxys

Jorge,

I have used both the 3M epoxy and the Hysol.  I did not put flox in the 3M on the wing ribs I installed and had to push it back into place about every 30 minutes until it set up enough to not sag.



I built another complete wing using Hysol and found that it did not sag, stays in place well, and needed no flox.



Flox can be added to Hysol to make it cure very hard.  It is useful this way to coat the foam used to make flaperon tips and such.  Mix up some Hysol with flox added, spread it on the foam wing flaperon tips and rasp, file, and sand to shape and smooth when cured.  Hard as a rock!



I also used Hysol with flox to fill and shape PVC wing strut fairing where they are trimed on the trailing edge to provide clearance to fold the wings.  The aluminum fairing cuff was riveted right into the harded flox/hysol mix.



If you do find you need to thicken up some hysol, go slow adding the flox.  By volume start with about 1/8th the volume of the total hysol mixed up.  Mix it in well, then mix in a 1/2 a teaspoon or teaspoon at a time until it is the consistency of peanut butter and holds its shape when you make a peak like whipped cream with it.



I use a set of cooking measuring spoons and eyeball the volumes when mixing.

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Aug 04, 2008 4:45 pm Post subject: epoxys

In models, we used the glass beads (Microballoons) to allow the epoxy  

to be sanded more readily. The milled fiberglass (chopped fiberglass)  

really adds strength.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying...oops...holding short at 561.8 hrs



On Aug 4, 2008, at 8:00 AM, bob noffs wrote:



[quote] 



 as i understand it glass beads are not just like flox. beads are  

 used to stiffen the mix , say to use as filler, but they weaken the  

 mix and should not be used in a structural application.  bob noffs

 ---

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Tue Aug 05, 2008 5:02 am Post subject: epoxys

I have used silicon powder as a filler on my boat.  It is not nearly as

strong as flox but a lot smoother and harder than microballoons.  It's also

a lot heavier than either.



Noel



--

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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