Glass Casting and Mold Making Materials for Glass Fusing - Sundance Art Glass Center
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SunTech Mold Mix

For Casting Glass, Bronze, metals and other materials, for making furnaces for glass blowing and other applications.

A Castable Refractory mix developed specifically for glass slumping and casting.

Brand 10 Pound Bag 25 Pound Bag
castabl refractory mould mixture
SunTech Mold Mix
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Ten pounds of the dry powder is about 250 cubic inches.

Cast Glass Art
To see Examples of Cast Glass Art Projects made using SunTech Mold Mix
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  • Notice: this process is very complicated and the below instructions are a simple guideline.
  • Always wear a respirator when working with any refractory product even though this product does not contain asbestos.
  • Determine the volume of mold material needed: approximate ratio is 60% material to 40% water by volume.
  • Have your master mold prepared with mold release applied.
  • Add mold mix to water and stir to desired consistency by hand for small molds. For larger molds, use a drill and mixer. The total working time is approximately 10 to 12 minutes. Longer working times can be obtained by using slightly more water to create a looser mixture.
  • After pouring, vibrate out trapped air or poke the liquid with a small stick all over, but gently so as not to damage the master mold.
  • Set-up time is 20 to 30 minutes (or longer). Remove master mold.
  • Dry completely before putting in mold in kiln
    • It is important to completely dry before using
    • Crack lid ½"
    • Ramp mold to 200° F (water turns to steam at 212° F - so we are drying just below this temperature)
    • Soak (Hold Temp) for 2 hours
    • Turn off kiln and let cool naturally
    • Add your glass
    • Crack lid ½"
    • Ramp up 400° per hour to 1000° F
    • Soak (Hold Temp) for 2 hours
    • Close Lid
    • Continue to heat to the temperature you will fire your glass to.
    • When done, cool very slowly to prevent thermo shocking.
  • The finished mold can be reworked if you have changes, use files, drills, scrapers, etc.
  • The less you handle the finished mold the longer it will last. Always place large molds on a kiln shelf and move it while resting on the shelf.

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Sundance Art Glass, 6052 Foster Rd., Paradise, CA, 95969-3121, USA
Phone: 800-946-8452  |  Phone: 530-872-3021