Patty Gray Big Dam Slumping Mold

The Patty Gray Big Dam Slumping Mold from Creative Paradise is a rectangular dam form that holds glass inside its walls while it softens and conforms to the contained shape during firing. Glass is placed inside the inner area, which measures 10 inches by 8 inches with a depth of 0.5 inches, and as it heats it softens and takes that rectangular boundary by gravity. The outer mold footprint is 10.75 inches by 8.75 inches, with a diagonal of 13.25 inches.

Creative Paradise lists a fill weight of about 1005 grams for the inner area. Like all ceramic molds, this one is COE agnostic and reusable across many firings when prepped and cared for properly.

What does the Patty Gray Big Dam Slumping Mold make?
It shapes a rectangular slumped glass piece with an inner finished area of 10 inches by 8 inches. The dam walls contain the glass edges while it softens, so the finished piece comes out with clean, straight sides.

How does a dam slumping mold work?
Glass is set inside the dam frame and fired. As the temperature rises, the glass softens and conforms to the rectangular interior by gravity, with the dam walls holding the edges in place. Stacked glass sheets cut to the inner dimensions or a pre-fused blank of the same size both work well in this mold.

How much glass do I need?
Creative Paradise lists about 1005 grams for the inner area. Cut your glass to fit the 10 by 8 inch interior, weigh it before firing, and test a first run when the result matters.

What COE glass can I use with this mold?
Any COE. Ceramic molds are COE agnostic, so the same mold works with COE96, COE90, or other fusible glass. Match your firing schedule to the glass you are using.

How do I prep the mold before firing?
Coat the inner surfaces of the mold with a kiln shelf primer such as a boron nitride spray or a kiln wash such as Hotline Primo Primer, and let it dry completely before placing the glass. Re coat as needed between firings.

Specifications

• SKU: 165180
• Manufacturer: Creative Paradise (GM110)
• Makes: rectangular slumped glass panel
• Inner dimensions: 10 inches L x 8 inches W x 0.5 inches deep
• Mold size: 10.75 inches L x 8.75 inches W
• Diagonal: 13.25 inches
• Suggested fill weight: about 1005 grams
• Material: ceramic slumping mold, reusable
• Glass: any COE (COE agnostic)

Working Notes

These are guidelines, not guarantees. Every kiln fires a little differently, so test a small run first when the result matters and follow a slumping schedule suited to your glass and kiln.

• Prime the inner surfaces of the mold with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before placing the glass so the glass does not stick.
• Cut glass sheets to fit the 10 by 8 inch inner dimensions, or use a pre-fused blank of the same size. Place the glass inside the dam frame and fire so it softens and conforms to the rectangular interior by gravity.
• The mold is COE agnostic. Use a slumping schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the slumped piece. Re coat the mold with primer as needed between firings.
• The Slide Hi Temp brand separator is not recommended with these molds.

Creative Paradise Suggested Firing Schedule

This is a suggested COE96 starting schedule, not a guarantee. Every kiln fires differently. Test a small run and adjust the schedule for your glass and kiln.

Slump Schedule, Multiple Layers (COE96):

*Segment 4 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Helpful downloads: Fused Glass Fossils Tutorial (PDF) · Patty Gray Mold Instructions (PDF)

Description updated: July 6, 2026

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