Sand mold for IN the kiln - WarmGlass.com

Sand mold for IN the kiln

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Jan de Jong
Posts: 67
Joined: Sun Mar 09, 2003 3:31 pm
Location: The Netherlands

Sand mold for IN the kiln

Postby Jan de Jong » Sun Nov 26, 2017 5:24 am

Hello, what is the best and cheapest way to make a sand mold for in the kiln ? Thank you, Jan

Tony Smith
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Re: Sand mold for IN the kiln

Postby Tony Smith » Tue Nov 28, 2017 6:46 am

This thread from the archives should be helpful.
viewtopic.php?f=7&t=39990&p=346214&hilit=Bert+sand+mold#p346214

Tony
The tightrope between being strange and being creative is too narrow to walk without occasionally landing on both sides..." Scott Berkun

Jan de Jong
Posts: 67
Joined: Sun Mar 09, 2003 3:31 pm
Location: The Netherlands

Re: Sand mold for IN the kiln

Postby Jan de Jong » Wed Nov 29, 2017 6:19 am

Tony Smith wrote:This thread from the archives should be helpful.
viewtopic.php?f=7&t=39990&p=346214&hilit=Bert+sand+mold#p346214
Tony

Thank you Tony. But the problem is.....my knowledge of the English language is too poor. Am I wrong if I think the mentioned thread is about HOT glass ? Jan

Tony Smith
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Joined: Sun Mar 09, 2003 5:59 pm
Location: Massachusetts, USA
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Re: Sand mold for IN the kiln

Postby Tony Smith » Thu Nov 30, 2017 6:52 am

Some of the thread talks about hot casting. Then Bert talks about his experience kilncasting:

"Many years later, I was taught how to kilncast with sand. That lesson used 20% dry plaster mixed with the sand. I have switched to 25% alumina hydrate, because it lasts longer for me. I reuse my sand mixes over and over. I have experimented with many different sands over the years. Most I have tried work. The big deal is particle sizes. For the strongest mold, you need a range of particle sizes from coarse to fine. This will create the strongest matrix. If you only use finer particles, the weight of the glass will smush it down more, changing the pattern."

I would start with the 20% dry plaster and sand. Olivine sand is used for metal casting, and I've had success casting sheet glass into a dry plaster/olivine mixture. If you don't have access to olivine sand, then I suppose you could experiment with silica sand.

Tony
The tightrope between being strange and being creative is too narrow to walk without occasionally landing on both sides..." Scott Berkun


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