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<DIV><SPAN class=708303717-06092002><FONT face="Comic Sans MS" color=#0000ff
size=2>Gray...does Hobbypoxy #3 Thixotropic epoxy have cabosil in it or does it
have some other substance</FONT></SPAN></DIV>
<DIV><SPAN class=708303717-06092002><FONT face="Comic Sans MS" color=#0000ff
size=2>that makes it so thick?</FONT></SPAN></DIV>
<DIV><SPAN class=708303717-06092002> <FONT
face="Comic Sans MS" color=#0000ff size=2>Dave</FONT></SPAN></DIV>
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<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <B>On
Behalf Of </B>Gray E Fowler<BR><B>Sent:</B> Friday, September 06, 2002 9:37
AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> RE: What is CABOSIL
??<BR><BR></FONT></DIV><BR><FONT face=sans-serif size=2>Mike</FONT>
<BR><BR><FONT face=sans-serif size=2>Neither cabosil nor microballoons are
structural and they way you are using them is correct. Cabosil does not change
the strength of the epoxy much at all and is used just to increase the
thixotropic index -to make it not flow. 6% cabosil by weight when mechanically
mixed will turn a low viscosity resin into jelly. Microballoons do reduce the
strength of the epoxy but most of the time this is okay becuase it is still
strong enough for our airplane applications. And as you know microballoons
greatly increase volume and reduce the density of the epoxy.
<BR><BR><BR><BR>Gray Fowler<BR>Principal Chemical Engineer<BR>Composites
Engineering</FONT> <BR><BR><BR>
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<TD><FONT face=sans-serif size=1><B>"Baiano, Mike [HCS]"
<MBaiano2@HCSUS.JNJ.com></B></FONT> <BR><FONT face=sans-serif
size=1>Sent by: discussion-request@nsrca.org</FONT>
<P><FONT face=sans-serif size=1>09/06/2002 11:08 AM</FONT> <BR><FONT
face=sans-serif size=1>Please respond to discussion</FONT> <BR></P>
<TD><FONT face=Arial size=1> </FONT><BR><FONT
face=sans-serif size=1> To:
"'discussion@nsrca.org'"
<discussion@nsrca.org></FONT> <BR><FONT face=sans-serif
size=1> cc:
</FONT> <BR><FONT face=sans-serif size=1>
Subject: RE: What is CABOSIL
??</FONT></TR></TBODY></TABLE><BR><BR><BR><FONT face=Arial color=blue
size=2>HI Verne,</FONT> <BR><FONT face="Times New Roman" size=3> </FONT>
<BR><FONT face=Arial color=blue size=2>So does micro-balloon expoxy mixtures
have any structural strength? I have both micro-balloons and cabosil - and I'm
never quite sure when I should use one as opposed to the other. I generally
reserve the cabosil when I just want to thicken epoxy into a paste, and weight
isn't a huge issue. How do you decide which one to use for a particular
application?</FONT> <BR><FONT face="Times New Roman" size=3> </FONT>
<BR><FONT face=Arial color=blue size=2>Thanks,</FONT> <BR><FONT face=Arial
color=blue size=2>Mike</FONT> <BR><FONT face=Tahoma size=2>-----Original
Message-----<B><BR>From:</B> Verne Koester [mailto:verne@twmi.rr.com]
<B><BR>Sent:</B> Thursday, September 05, 2002 11:41 PM<B><BR>To:</B>
discussion@nsrca.org<B><BR>Subject:</B> Re: What is CABOSIL
??<BR></FONT><BR><FONT face="Times New Roman" size=4>Cabosil is fumed silica
sand. It's extremely light weight. When mixed with epoxy finishing resin, it
creates a paste that won't run on vertical surfaces. It's also frequently
mixed with epoxy in a thinner mix and brushed into a mold to create the
external gel coat on a glass part which prevents pinholes from making it to
the surface of a part. On a clear epoxy-cloth piece, the epoxy/cabosil mix can
be seen in all the 90-degree corners to bridge the radius the cloth can't
make. It'll show as an opaque white as opposed to the clear epoxy/cloth you
see everywhere else. Down side is that it's much tougher to sand than
micro-balloons and has virtually no structural strength. Good stuff to have
around, though. I use it a lot.</FONT> <BR><FONT face="Times New Roman"
size=3> </FONT> <BR><FONT face="Times New Roman" size=4>Verne</FONT>
<BR><FONT face="Times New Roman" size=3> </FONT> <BR><FONT
face="Times New Roman" size=3> </FONT> <BR><FONT face="Times New Roman"
size=3>----- Original Message ----- </FONT><BR><FONT face="Times New Roman"
size=3><B>From:</B> </FONT><A href="mailto:extra330@tampabay.rr.com"><FONT
face="Times New Roman" color=blue size=3><U>Van - E-Mail
LIST</U></FONT></A><FONT face="Times New Roman" size=3> </FONT><BR><FONT
face="Times New Roman" size=3><B>To:</B> </FONT><A
href="mailto:discussion@nsrca.org"><FONT face="Times New Roman" color=blue
size=3><U>Pattern LIST</U></FONT></A><FONT face="Times New Roman" size=3>
</FONT><BR><FONT face="Times New Roman" size=3><B>Sent:</B> Thursday,
September 05, 2002 8:32 PM</FONT> <BR><FONT face="Times New Roman"
size=3><B>Subject:</B> What is CABOSIL ??</FONT> <BR><BR><FONT
face="Times New Roman" size=2>Don't think I know what this is ?</FONT>
<BR><FONT face="Times New Roman"
size=2>________________________________________________</FONT> <BR><FONT
face="Times New Roman" size=3> </FONT> <BR><FONT face="Times New Roman"
size=2>Van Flowers<BR>AMA: 6216 IMAC: 2229 <BR>IMAA: 26019 NSRCA:
2778</FONT><FONT face="Times New Roman" color=blue size=2><U><BR></U></FONT><A
href="http://www.rc-aerobatics.com/"><FONT face="Times New Roman" color=blue
size=2><U>www.rc-aerobatics.com</U></FONT></A> <BR><FONT
face="Times New Roman" size=3> </FONT> <BR><FONT face="Times New Roman"
size=3> </FONT> <BR><FONT face="Times New Roman" size=3> </FONT>
<BR><FONT face="Times New Roman" size=3> </FONT>
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