What is CABOSIL ??

[Bill Glaze]

Agree:  I had the pleasure of meeting/judging them at the Nats'.  Great
flyers, very knowledgeable.
We're very fortunate to have so many folks who are so skilled at many
disciplines which apply to our hobby/sport on this list.  And, more
importantly, they are so willing to share their expertise with us.

Bill Glaze

> I have got to tell you, from the e-mails I have read from Gray and
> Lance in the last few weeks as I ready to build my Entropy. I have
> learned a TON about glass and gear. this is VERY VERY cool. Thanks
> guys, Van________________________________________________ Van Flowers
> AMA: 6216 IMAC: 2229
> IMAA: 26019 NSRCA: 2778
> www.rc-aerobatics.com
>
>      ----- Original Message -----
>      From: Gray E Fowler
>      To: discussion at nsrca.org
>      Sent: Friday, September 06, 2002 12:37 PM
>      Subject: RE: What is CABOSIL ??
>
>
>
>      Mike
>
>      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.
>
>
>
>      Gray Fowler
>      Principal Chemical Engineer
>      Composites Engineering
>
>
>

        "Baiano, Mike [HCS]"
        <MBaiano2 at HCSUS.JNJ.com>                    To:
        Sent by:                            "'discussion at nsrca.org'"
        discussion-request at nsrca.org        <discussion at nsrca.org>
                                                    cc:
        09/06/2002 11:08 AM                         Subject:        RE: What
        Please respond to discussion        is CABOSIL ??
>
>
>
>      HI Verne,
>
>      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?
>
>      Thanks,
>      Mike
>      -----Original Message-----
>      From: Verne Koester [mailto:verne at twmi.rr.com]
>      Sent: Thursday, September 05, 2002 11:41 PM
>      To: discussion at nsrca.org
>      Subject: Re: What is CABOSIL ??
>
>      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.
>
>      Verne
>
>
>      ----- Original Message -----
>      From: Van - E-Mail LIST
>      To: Pattern LIST
>      Sent: Thursday, September 05, 2002 8:32 PM
>      Subject: What is CABOSIL ??
>
>      Don't think I know what this is ?
>      ________________________________________________
>
>      Van Flowers
>      AMA: 6216 IMAC: 2229
>      IMAA: 26019 NSRCA: 2778
>      www.rc-aerobatics.com
>
>
>
>
>
>
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