micro-balloons etc

[Rcmaster199 at aol.com]

In a message dated 5/18/2003 8:42:56 PM Eastern Daylight Time, 
Tom.Koenig at actewagl.com.au writes:


> Subj:micro-balloons etc 
> Date:5/18/2003 8:42:56 PM Eastern Daylight Time
> From:<A HREF="mailto:Tom.Koenig at actewagl.com.au">Tom.Koenig at actewagl.com.au</A>
> Reply-to:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> To:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> Sent from the Internet 
> 
> 
> 
> 
> Help.....please
> 
> Gray, Matt, Lance.... anyone.
> 
> I have a huge tub at home that is a white fluffy powder, which weighs
> nothing...( Nooooo....not that sort of powder<VBG>) I dont know wether it 
> is
> micro balloons or cabosil, or whatever.
> When I mix it with epoxy it sort of forms the white stuff which you 
> commonly
> see in the corners of layups ( to help lay the glass), but it isnt quite 
> the
> same, it seems to be more translucent.
> Am I not mixing properly? It seems that when I keep adding more powder it
> becomes too dry and unworkable. It also doesn't seem that light which makes
> me think it isnt micro balloons. Is it the resin I'm using ( LC 3600)?
> 
> Sorry for the moronic question...but how can I tell what I've got? Also 
> what
> exactly is used as the fillers in the ZN kits, Bollys etc ? Do they use a
> thixotropic additive in the resin when they form the fillets etc.
> 
> Thanks guys
> 
> Tom

Tom It's probably cabosil fumed silica. This material makes epoxy thixotropic 
when used in smaller quantities. I don't like it as filler because it is very 
tough to sand. But as an additive to epoxy for mold making, it's great stuff, 
since it produces a pretty hard surface, and very smooth finish.

Matt 
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