Epoxies

[Koenig, Tom]

Gray,
 
very informative, thanks for that. Now.....I've got about as much of a
chance of finding Shell 8500 down here as I have of being World champion,
and even if I did, it would probably have to be in a 44. What would I do
with the other 43.9 Gallons???!!!!
 
Back to the good old LC 3600 for my cowls etc.
 
Tom
 
 

-----Original Message-----
From: Gray E Fowler [mailto:gfowler at raytheon.com]
Sent: Wednesday, 26 March 2003 10:36 AM
To: discussion at nsrca.org
Subject: RE: question regarding header & tuned pipe



Tom-had to resend without all the attachments 

Morton Thiokol does not make resin, BUT you are on to something......Morton
Thiokol, now called ATK ,filament winds rocket motor casings, and that Shell
8500 is a favorite of filament winder guys. Epoxies typically have extremely
long shelf lifes. Some preformulated epoxies do have consituents that may
increase the viscosity with age, if not refridgerated. As far as cost goes
it is all relative. There are expensive epoxies at about $15 lb.  Regular
epoxy (bisphenol A) is $3 lb when purchased in a 55 gallon drum and  about
twice that by the gallon. High temperature resistance usually comes from th
echoice of hardener not the epoxy resin.  Epoxy resins that can increase
temperature (multifunctional) resistance are solids at room temperature-not
too pattern guy user friendly. Preformulated epoxy systems cost 5X-10X the
raw material-usually from the hardener side. Example-West systems epoxy is a
"formulated" hardener , ! that is a blend of several components and the
epoxy side is packaged straight from the drum.





Gray Fowler
Principal Chemical Engineer
Composites Engineering


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