Message-Id: <200407072015.i67KFHW12402@envelope.rose-hulman.edu>
From: "Alex Madsen" <madsena@rose-hulman.edu>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: High Temperature Epoxy Selection
Date: Wed, 7 Jul 2004 14:15:09 -0600
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In-Reply-To: <list-245703@logan.com>

Good news. I called De-Comp Composites today. Their High Temperature
Laminating Rigid HTR-250 and High Temperature Laminating Flame Retardant
HTR-250-FR is $52 for a gallon. HTR-250 uses 100:5 HTE-48 hardener which =
is
$31.5/lb.  HTR-250-FR uses 100:25 HT-106-3 which is $14.08/2lb. The kit =
of
resin and hardener for High Temperature Laminating Flame Retardant is
$66.08.
Spec Sheets below
Alex Madsen

HTR-250
HARDENER:  HTE-48
RATIO:  100 pbw to 5 pbw
GENERAL DESCRIPTION:  HTR-250 is an unfilled tough, strong resin system =
with
good heat distortion, chemical resistance and excellent adhesive =
quality.

TYPICAL PHYSICAL PROPERTIES
Ratio by Weight 100 pbw to 5 pbw=20
Pot Life 45 minutes @ 200=BAF=20
Hardness, Shore "D"  90=20
Tensile Strength, PSI 9,500=20
Compressive Strength, PSI  15,000=20
Flexural Strength, PSI 15,000=20
Heat Distortion 325=BAF=20
Density:  Resin 9.6=20
                Hardener 8.1=20
                Mixed 9.52=20
Specific Gravity:  Resin 1.16=20
                              Hardener .98=20
                              Mixed 1.15=20
Shelf Life:   Resin/Hardener 1 year=20

=20

HTR-250-FR
HARDENER:  HT-106-3
RATIO:  100 pbw to 25pbw
GENERAL DESCRIPTION:  HTR-250-FR is an unfilled tough, strong flame
retardant resin system with good heat distortion, chemical resistance =
and
excellent adhesive quality.

TYPICAL PHYSICAL PROPERTIES
Ratio by Weight 100 pbw to 25 pbw=20
Ratio by Volume 4 to 1=20
Pot Life 90 minutes=20
Hardness, Shore "D"  85-88=20
Hardness, Shore "D"  (350=BA F) 84-86=20
Flexural Strength @ 72=BAF 55,000=20
Flexural Strength @ 350=BAF 36,000=20
Flexural Modulus @ 72=BAF 6.25 x 106=20
Flexural Modulus @ 350=BAF 4.10 x 106=20
Heat Distortion 375=BAF=20
Density:  Resin 9.6=20
                Hardener 7.8=20
                Mixed 9.25=20
Specific Gravity:  Resin 1.18=20
                              Hardener .94=20
                              Mixed 1.11=20
Shelf Life:   Resin/Hardener 1 year=20

=20


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Alex Madsen
Sent: Wednesday, July 07, 2004 10:56 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: High Temperature Epoxy Selection

Nice site. I will call them tomorrow and see what they have to say.
Maybe I can get a test sample or the "student experiment" discount.

Alex Madsen

P.S. (I am not sure if I should mention this yet) If all goes will with
manifold development I may eventually look into compost exhaust with
this stuff:
http://www.graphitestore.com/itemDetails.asp?item_id=3D1561&prd_id=3D6&ca=
t_i
d=3D4&curPage=3D1

This will be an even more interesting experiment.=20

Alex Madsen

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Marvin Kaye
Sent: Wednesday, July 07, 2004 12:43 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: High Temperature Epoxy Selection

I did a Google search on "high temperature laminating epoxy" and came up
with=20
a huge amount of hits.  I particularly liked what I saw at De-Comp=20
Composites... http://www.decomp.com/indexA.htm.  Once there and poking
around=20
I noticed that some of their product line is used by Boeing... quite the

recommendation.  Down in the hi-temp laminating area I spotted all sorts
of=20
resin systems, all requiring post cure, and all with very impressive
strength=20
numbers.  I clicked on their link to a hi-temp flame retardant system=20
(http://www.decomp.com/laminate/htlfr.htm) which is good to a HDT of
375F, has=20
a mixed specific gravity of 1.11 (figure 11% thicker than water...
excellent=20
for layups) and thought it would be an ideal candidate.  Post cures in a

kitchen oven (if the parts will fit and the Missus doesn't mind) is
actually=20
quite simple, as is vacuum bagging.  You don't actually need a real
vacuum=20
pump, as you can pull a good vacuum with a shop-vac or on the intake
side of=20
your air compressor.  I buy my bagging supplies from FibreGlast
Developments=20
(hardware & fittings, bagging plastic, sealing tape) but I get my peel
ply=20
from Aircraft Spruce and my breather ply from Joanne Fabrics (polyester=20
fiber-fill batt insulation).  ACS is also a reasonbly priced source for
carbon=20
fiber ($16.95/yd is excellent).  I have paid as much as $37/yd for wider

crow's foot weave, but that is a bit of a specialty product... much
stronger=20
than plain weave, goes around curves really well and pleasant to work
with...=20
it's just expensive.  Attached is my latest CF creation.. it's a ventral
fin I=20
added to the tail of the IVP I've been talking about.  There are 14
plies=20
around the edges and there's about no deflection when you beat on it.
It's=20
basically 4 plies CF each side over a hardwood-strengthened foam core
with the=20
edges wrapped and the whole thing peel plyed.  I really enjoy composite
work,=20
and am always happy to talk about it.  Enough for now.  Thanks for
listening.

       <Marv>
 =20


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