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Sand mold for IN the kiln

Posted: Sun Nov 26, 2017 5:24 am
by Jan de Jong
Hello, what is the best and cheapest way to make a sand mold for in the kiln ? Thank you, Jan

Re: Sand mold for IN the kiln

Posted: Tue Nov 28, 2017 6:46 am
by Tony Smith
This thread from the archives should be helpful.
http://www.warmglass.com/phpBB3/viewtop ... ld#p346214

Tony

Re: Sand mold for IN the kiln

Posted: Wed Nov 29, 2017 6:19 am
by Jan de Jong
Tony Smith wrote:This thread from the archives should be helpful.
http://www.warmglass.com/phpBB3/viewtop ... ld#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

Re: Sand mold for IN the kiln

Posted: Thu Nov 30, 2017 6:52 am
by Tony Smith
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

Re: Sand mold for IN the kiln

Posted: Tue Dec 26, 2017 12:06 pm
by Jan de Jong
@ Tony Smith: Due to illness a late response.....thank you very much for your answer !!! Jan

Re: Sand mold for IN the kiln

Posted: Sat Jun 30, 2018 8:57 am
by FusedLightStudio
Hi Tony - I am also interested in this technique - does it matter what kind of plaster? No. 1 plaster, or plaster of Paris...?

Re: Sand mold for IN the kiln

Posted: Sun Jul 01, 2018 10:39 am
by Tony Smith
I've used #1 plaster. I'm not sure how that's different from plaster of Paris.

Tony