micro-balloons etc

[Koenig, Tom]

Hi again
 
Thank you all for the replies. I am actually making a mold, and want to make
life a little easier, so I'll use the cabosil there. However for the
finished item (moulding) I also want to make life easier than before, so it
looks like I'll go and buy a bag of micro-balloons for that. Previously, I
never used any fillers, but I must admit it is difficult ( not impossible
though) to do all those sharp corners without them.
 
I must be getting soft!!
 
Thanks guys

-----Original Message-----
From: Rcmaster199 at aol.com [mailto:Rcmaster199 at aol.com]
Sent: Monday, 19 May 2003 2:36 PM
To: discussion at nsrca.org
Subject: Re: micro-balloons etc


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: Tom.Koenig at actewagl.com.au <mailto:Tom.Koenig at actewagl.com.au> 
Reply-to: discussion at nsrca.org <mailto:discussion at nsrca.org> 
To: discussion at nsrca.org <mailto:discussion at nsrca.org> 
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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