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#1
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plaster molds
Can anybody tell me, how to reduce cracking of plaster molds.
Thank you very much in advance. Jan |
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#2
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Ahoj Zenka
Please give more information: What is your mold mixture? What temperature are you heating the molds to and for how long. Start with answering those questions and perhaps we can help. Jindri Can anybody tell me, how to reduce cracking of plaster molds. Thank you very much in advance. Jan |
#3
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Ahoj Jindrichu,
Mold mixture is plaster:silica 1: 1,5 I am using 720 degrees of Centrigrade for 60 min. Thank you very much for your kind response. Jan |
#4
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Hi Jan,
there are lots of different mold formulas. The one in my book for plaster/silica is: 1 part No. 1 Pottery plaster to 1 part Silica flour mix dry ingredients together well before adding water use 50 parts water to 100 parts mix use the slow cure method (I'm not sure how slow that is) for large molds add 1 cup chopped fiber to 5 lbs water before adding to mix Wrap your mold with wire when you go to fuse the glass. Hope this helps. -- Connie Ryman Cryman Studio wrote in message oups.com... Ahoj Jindrichu, Mold mixture is plaster:silica 1: 1,5 I am using 720 degrees of Centrigrade for 60 min. Thank you very much for your kind response. Jan |
#5
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plaster molds
I was always worried about the health risks of silica flour so used to
use Molochite or Sinterlite (calcined clays) But now I am getting exellent results with SRS Ltd.'s "Glass" which is ready mixed. It costs £15.80 for 25kg from Special Plasters in Hockley Birmingham. (not on web i think) Marcia On 25 Dec 2004 09:55:38 -0800, (Zenka) wrote: Can anybody tell me, how to reduce cracking of plaster molds. Thank you very much in advance. Jan |
#6
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plaster molds
Marcia wrote:
I was always worried about the health risks of silica flour so used to use Molochite or Sinterlite (calcined clays) But now I am getting exellent results with SRS Ltd.'s "Glass" which is ready mixed. It costs £15.80 for 25kg from Special Plasters in Hockley Birmingham. (not on web i think) Marcia I am afraid you have essentially reduced the health concern, and much less the hazard. With a ready made dry mix you have veru much the same amount of airborne dust while mixing it with water. -lauri |
#7
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plaster molds
On Thu, 16 Aug 2007 08:47:53 +0300, Lauri Levanto
wrote: Its not the dust thats the problem but what it contains. silica is very hazardous whereas refractories containing calcined clay are not so. Marcia wrote: I was always worried about the health risks of silica flour so used to use Molochite or Sinterlite (calcined clays) But now I am getting exellent results with SRS Ltd.'s "Glass" which is ready mixed. It costs £15.80 for 25kg from Special Plasters in Hockley Birmingham. (not on web i think) Marcia I am afraid you have essentially reduced the health concern, and much less the hazard. With a ready made dry mix you have veru much the same amount of airborne dust while mixing it with water. -lauri |
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