Marcia Selsor on wed 18 oct 00
Dear Karen,
I saw some awesome clay/glass combination work in Iceland. Also, several
ceramics were using clay molds for CASTING glass. It was fired hotter
than a bisque -1200 C. The hotter it went, the color changed. It is
something I wanted to play around with. One artist used the clay molds
as part of the piece in a positive and negative image. Very beautiful
pieces and looked like Ice. Icelanders are very interesting folks.
Marcia
Karen Sullivan wrote:
>
>
> >
> > Thought ceramic artists would be interested in this. Almost all suppliers of
> > glass slumping molds are having a very hard time getting molds for glass work.
> > Most of these molds are nothing more than simple bisque plates & shallow
> > bisque bowls. One of my suppliers told me today she is thrilled to find this
> > guy doing them in his garage even though he can't keep up with the demand.
> > Another one just chuckles when I ask when they will get them in stock. Glass
> > fusing & slumping has grown in leaps & bounds in recent years. Sounds like a
> > major opportunity for a potter.
> >
> > Karen K.
> > Gift Garden Stained Glass
> > giapet@softhouse.com
> >
> >
> >
> >
>
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--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/spain99.html
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Craig Martell on wed 18 oct 00
Hi:
I make glass slumping molds for my wife, Linda Owen, who was a potter for
over 20 yrs but gave it up. She makes some of her own too but I do the
thrown ones for her.
You can use many clays to make slump molds but they won't last. The reason
is that slumpers and fusers do a very fast cool through the quartz
inversion to prevent or minimize devitrification of the glass. This is
good for glass but bad for clay molds. They will eventually fail. The
approach I've taken to avoid this is to develop a claybody for the molds
that is as low in free quartz as I can get it. The silica/alumina ratio of
the clay is about 3.2/1. I've also fluxed the clay to be pretty tight at
cone 02. I've added some stuff to help develop primary mullite for some
strength. So far, the molds are holding up very well. I've made plate,
bowl, and platter molds for her, up to 20 inches in dia. When I was
working on the claybody, I received some very good help and advice from Ron
Roy and Jim Robinson.
Marcia Selsor on thu 19 oct 00
Craig,
Thanks for the advice. The clay molds I saw looked like stoneware and
were fired to 1200C.
That is a lot hotter than a bisque. I wonder if the clay would hold up
for just one firing with the glass.
Any insight is appreciated.
Marcia
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> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/spain99.html
http://www.silverhawk.com/ex99/selsor/welcome.html
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