plaster molds

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

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

Hi Jan, there are lots of different mold formulas. The one in my book for plaster/silica is:

Wrap your mold with wire when you go to fuse the glass.

Hope this helps.

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