Re: refractory materials

[Harmon Seaver <hseaver@cybershamanix.com>]

    Why would you choose vermiculite over perlite? Not that I know one is better
than the other, but isn't perlite more insulating? I've been using that and
diatomaceous earth w/cement for refractory.


On Thu, Nov 07, 2002 at 07:40:57AM -0500, Norbert Senf wrote:
> At 08:01 PM 2002-11-05 -0700, Ron Larson wrote:
> >(snip) I have to
> >agree with Dean that we can probably do better (especially in developing
> >countries) by making our own materials.  A key could be what this site 
> >calls
> >"bonding agent" - what is this?
> 
> Hi Ron and stovers:
> 
> Bonding agents that we have used for vermiculite include:
> 
> portland cement (breaks down at 600 F)
> calcium aluminate cement
> clay
> sodium silicate
> 
> We can get vermiculite here (Ottawa Canada) in 3 grades:
> plaster aggregate (fine)
> concrete aggregate ( coarse)
> Block fill (treated with a silicone water repellent)
> 
> It soaks up a lot of water, so one of the tricks to mixing it is to add the 
> water first, to satisfy the vermiculite's "thirstyness", before adding the 
> binder.
> 
> Best ...... Norbert Senf
> ----------------------------------------
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-- 
Harmon Seaver	
CyberShamanix
http://www.cybershamanix.com

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