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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
Pot Life 45 minutes @ 200ºF
Hardness, Shore "D" 90
Tensile Strength, PSI 9,500
Compressive Strength, PSI 15,000
Flexural Strength, PSI 15,000
Heat Distortion 325ºF
Density: Resin 9.6
Hardener 8.1
Mixed 9.52
Specific Gravity: Resin 1.16
Hardener .98
Mixed 1.15
Shelf Life: Resin/Hardener 1 year
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
Ratio by Volume 4 to 1
Pot Life 90 minutes
Hardness, Shore "D" 85-88
Hardness, Shore "D" (350º F) 84-86
Flexural Strength @ 72ºF 55,000
Flexural Strength @ 350ºF 36,000
Flexural Modulus @ 72ºF 6.25 x 106
Flexural Modulus @ 350ºF 4.10 x 106
Heat Distortion 375ºF
Density: Resin 9.6
Hardener 7.8
Mixed 9.25
Specific Gravity: Resin 1.18
Hardener .94
Mixed 1.11
Shelf Life: Resin/Hardener 1 year
-----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=1561&prd_id=6&cat_i
d=4&curPage=1
This will be an even more interesting experiment.
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
a huge amount of hits. I particularly liked what I saw at De-Comp
Composites... http://www.decomp.com/indexA.htm. Once there and poking
around
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
resin systems, all requiring post cure, and all with very impressive
strength
numbers. I clicked on their link to a hi-temp flame retardant system
(http://www.decomp.com/laminate/htlfr.htm) which is good to a HDT of
375F, has
a mixed specific gravity of 1.11 (figure 11% thicker than water...
excellent
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
quite simple, as is vacuum bagging. You don't actually need a real
vacuum
pump, as you can pull a good vacuum with a shop-vac or on the intake
side of
your air compressor. I buy my bagging supplies from FibreGlast
Developments
(hardware & fittings, bagging plastic, sealing tape) but I get my peel
ply
from Aircraft Spruce and my breather ply from Joanne Fabrics (polyester
fiber-fill batt insulation). ACS is also a reasonbly priced source for
carbon
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
than plain weave, goes around curves really well and pleasant to work
with...
it's just expensive. Attached is my latest CF creation.. it's a ventral
fin I
added to the tail of the IVP I've been talking about. There are 14
plies
around the edges and there's about no deflection when you beat on it.
It's
basically 4 plies CF each side over a hardwood-strengthened foam core
with the
edges wrapped and the whole thing peel plyed. I really enjoy composite
work,
and am always happy to talk about it. Enough for now. Thanks for
listening.
<Marv>
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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