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<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003>Gray,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=873243201-26032003>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???!!!!</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=873243201-26032003>Back
to the good old LC 3600 for my cowls etc.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003>Tom</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=873243201-26032003></SPAN></FONT> </DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Gray E Fowler
[mailto:gfowler@raytheon.com]<BR><B>Sent:</B> Wednesday, 26 March 2003 10:36
AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> RE: question
regarding header & tuned pipe<BR><BR></FONT></DIV><BR><FONT
face=sans-serif size=2>Tom-had to resend without all the attachments</FONT>
<BR><BR><FONT face=sans-serif size=2>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.<BR></FONT><BR><FONT face=sans-serif size=2><BR><BR><BR><BR>Gray
Fowler<BR>Principal Chemical Engineer<BR>Composites
Engineering</FONT></BLOCKQUOTE></BODY></HTML>
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