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Silicated Plaster Recipe Needed

Posted: Sun Apr 18, 2004 1:19 pm
by suntoys
Does anybody have a recipe for the combination needed to mix silicate powder and casting plaster for mold making? Thank you.

Posted: Sun Apr 18, 2004 5:30 pm
by rosanna gusler
i do it by weight. 1:1:1 . this is a fairly thick mix. you can reduce the dry a hair if you want. rosanna

Posted: Sun Apr 18, 2004 5:35 pm
by suntoys
Thank you very much. I hope that everybody that's looking at this post can appreciate this.

Posted: Mon Apr 19, 2004 4:48 pm
by Wallace Venable
I use equal parts of:
Plaster of Paris (from Lowes)
Diatomateous Earth (swimming pool filter media from Walmart)
to which I add about 5% kiln wash (Hot Line or Bullseye)

It may not be "the best" mix, but the only exotic stuff is the shelf wash, which you should already have.

This mix can be reused several times if kept below about 1450° F.

I've run over ten slumpson a single mold when bending stained glass panels for "Tiffany" replacements.

Posted: Mon Apr 19, 2004 7:58 pm
by Barbara Cashman
Wallace Venable wrote:I use equal parts of:
Plaster of Paris (from Lowes)
Diatomateous Earth (swimming pool filter media from Walmart)
to which I add about 5% kiln wash (Hot Line or Bullseye)

It may not be "the best" mix, but the only exotic stuff is the shelf wash, which you should already have.

This mix can be reused several times if kept below about 1450° F.

I've run over ten slumpson a single mold when bending stained glass panels for "Tiffany" replacements.

Does this mixture shrink when you use specifically for the replacement bent panel lamps? - Barbara