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expanding a mold

updated tue 7 mar 06

 

Fredrick Paget on sun 5 mar 06


>hello everyone ,
>
>I wrote a message earlier about porcelain and how to reduce the shrink , the
>reason i wanted to reduce it was because my dad made me a horse out of stone
>cas t which is a hard form of plaster , i wanted to make six of these horses
>the same size out of porcelain but im finding it hard with the porcelain
>shrinking.
Gemma,
There used to be a plaster made for this purpose. It had an
especially high expansion and was used for the purpose you have
requested. I believe that it is no longer made by the original
company but maybe some where in the world there may be a similar
product.
Any one know?

--
From Fred Paget,
Marin County, CA, USA
fredrick@well.com
http://homepage.mac.com/fredrick/FileSharing1.html
Charter Member Potters Council

Don Goodrich on mon 6 mar 06


Gemma & Fred,
There's an expanding material called Hydrospan.
It's not a plaster, but may be useful for what
you're trying to do. If not, it looks like it would
be fun to play with anyway! Here's a link:
http://www.sculpt.com/catalog_98/CastingMaterials/HydroSpan.htm

Good luck,
Don Goodrich

goodrichdn@aol.com
http://dongoodrichpottery.com/

On Sun, 5 Mar 2006 21:31:39 -0800, Fredrick Paget wrote:

> Gemma,
>There used to be a plaster made for this purpose. It had an
>especially high expansion and was used for the purpose you have
>requested. I believe that it is no longer made by the original
>company but maybe some where in the world there may be a similar
>product.
>Any one know?
>