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Old 03-01-2019, 03:58 AM
raph innri raph innri is offline
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Mold +1300C

Hello everyone,

I am a designer, and new on this forum so forgive me in advance if I appear neophyte.

For a very particular realization I try to manufacture a mold whose characteristics are as follows:

-is placed in the kiln for firing
-resist at 1300 C
-resist the time of firing (typical ceramic firing)
-do not burn
-homemade

I am doing tests with a silico-plaster mixture, but the plaster does not behave well beyond 1000 C. And my material stick to it.

The casting "red sand" could be a solution at 1300C, but I don't know how long it can resist to this temp.

Thank you all for your help.
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Old 03-01-2019, 07:32 AM
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Pete VanderLaan Pete VanderLaan is offline
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1300C=2375F. That's a hot kiln and no plaster will survive it. Graphite may survive it but not for all that long. A mold made from Hydrated alumina and silica would do OK but not for that long.

I do assume you are trying to hot ladle glass into an open faced mold. Or is it the case that you are loading the mold with cullet? In that case, this is all too hot.
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Old 03-01-2019, 06:55 PM
Art Freas Art Freas is offline
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It is too hot. Also are you using a release agent?
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Old 03-03-2019, 11:15 AM
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Greg Vriethoff Greg Vriethoff is offline
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You will be hard-pressed to make a "homemade" mold that will work within these parameters. Plaster begins to break down at around 800C, so I would abandon it. Sand/silica is always going to stick (especially at the temps you are suggesting), so you will need a release of some sort.

I understand that as a designer you probably can't share too many details, but it would be helpful if we knew what the desired results are. Someone may have an alternate path to offer.
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Old 03-05-2019, 12:42 AM
Lynn Read Lynn Read is offline
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Can you give us more information on your goal?
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Old 03-05-2019, 07:21 AM
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Pete VanderLaan Pete VanderLaan is offline
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raph may be the equivalent of a drive by shooting. He registered from Iceland and has yet to return.
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