<br><font size=2 face="sans-serif">Dave-</font>
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<br><font size=2 face="sans-serif">I do not know. I have never seen or used hobby poxy 3. <br>
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Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</font>
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<td><font size=1 face="sans-serif"><b>"David Harmon" <k6xyz@attbi.com></b></font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">09/06/2002 12:39 PM</font>
<br><font size=1 face="sans-serif">Please respond to discussion</font>
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<br><font size=1 face="sans-serif"> To: <discussion@nsrca.org></font>
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<br><font size=1 face="sans-serif"> Subject: RE: What is CABOSIL ??</font></table>
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<br><font size=2 color=blue face="Comic Sans MS">Gray...does Hobbypoxy #3 Thixotropic epoxy have cabosil in it or does it have some other substance</font>
<br><font size=2 color=blue face="Comic Sans MS">that makes it so thick?</font>
<br><font size=3 face="Times New Roman"> </font><font size=2 color=blue face="Comic Sans MS">Dave</font>
<br><font size=2 face="Tahoma">-----Original Message-----<b><br>
From:</b> discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <b>On Behalf Of </b>Gray E Fowler<b><br>
Sent:</b> Friday, September 06, 2002 9:37 AM<b><br>
To:</b> discussion@nsrca.org<b><br>
Subject:</b> RE: What is CABOSIL ??<br>
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Mike</font><font size=3 face="Times New Roman"> <br>
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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>
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Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</font><font size=3 face="Times New Roman"> <br>
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<td width=49%><font size=1 face="sans-serif"><b>"Baiano, Mike [HCS]" <MBaiano2@HCSUS.JNJ.com></b></font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
Sent by: discussion-request@nsrca.org</font><font size=3 face="Times New Roman"> </font>
<p><font size=1 face="sans-serif">09/06/2002 11:08 AM</font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
Please respond to discussion</font><font size=3 face="Times New Roman"> </font>
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To: "'discussion@nsrca.org'" <discussion@nsrca.org></font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
cc: </font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
Subject: RE: What is CABOSIL ??</font></table>
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HI Verne,</font><font size=3 face="Times New Roman"> <br>
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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><font size=3 face="Times New Roman"> <br>
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Thanks,</font><font size=3 face="Times New Roman"> </font><font size=2 color=blue face="Arial"><br>
Mike</font><font size=3 face="Times New Roman"> </font><font size=2 face="Tahoma"><br>
-----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 ??</font><font size=3 face="Times New Roman"><br>
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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><font size=3 face="Times New Roman"> <br>
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Verne</font><font size=3 face="Times New Roman"> <br>
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----- Original Message ----- <b><br>
From:</b> </font><a href=mailto:extra330@tampabay.rr.com><font size=3 color=blue face="Times New Roman"><u>Van - E-Mail LIST</u></font></a><font size=3 face="Times New Roman"> <b><br>
To:</b> </font><a href=mailto:discussion@nsrca.org><font size=3 color=blue face="Times New Roman"><u>Pattern LIST</u></font></a><font size=3 face="Times New Roman"> <b><br>
Sent:</b> Thursday, September 05, 2002 8:32 PM <b><br>
Subject:</b> What is CABOSIL ?? <br>
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Don't think I know what this is ?</font><font size=3 face="Times New Roman"> </font><font size=2 face="Times New Roman"><br>
________________________________________________</font><font size=3 face="Times New Roman"> <br>
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Van Flowers<br>
AMA: 6216 IMAC: 2229 <br>
IMAA: 26019 NSRCA: 2778</font><font size=3 color=blue face="Times New Roman"><u><br>
</u></font><a href="http://www.rc-aerobatics.com/"><font size=2 color=blue face="Times New Roman"><u>www.rc-aerobatics.com</u></font></a><font size=3 face="Times New Roman"> <br>
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