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Pate de Verre lesson

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Pate de Verre lesson

Postby Keith » Fri Nov 18, 2016 4:05 pm

Hello, I just watched the new video on making a mold for a pate de verre bowl. In the first step they use #1 plaster to make the plaster mold from the found object. When they go to make the 2 layer refractory mold they use "investment" for the first layer. My question is can I use #1 plaster for the 1st layer instead of "investment"? If not what is the difference?

Thanks
Keith
 
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Re: Pate de Verre lesson

Postby marykaynitchie » Mon Nov 21, 2016 9:34 am

Hi Keith,

Investment in this case is plaster-silica, which holds up to kiln process temperatures better than plaster. If you use only plaster, it is likely to crack while the glass is liquid, which may ruin your piece (at best) and could lead to the entire mold breaking, releasing flowing glass into your kiln (at worst).

http://shop.bullseyeglass.com/bullseye- ... 27-kg.html

Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

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Re: Pate de Verre lesson

Postby Keith » Mon Nov 21, 2016 1:17 pm

Thanks. That does not sound like any outcome I would enjoy.

Keith
Keith
 
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