Patty Gray 4" Square Dam Casting Mold

The Patty Gray 4 Inch Square Dam Casting Mold from Creative Paradise is a ceramic dam mold that forms one 4 inch by 4 inch square cast glass piece per firing. The outer mold frame measures 4.75 inches by 4.75 inches, with an inner casting area of 4 inches by 4 inches. Creative Paradise suggests about 205 grams of glass for a full fill using multiple stacked layers.

As a ceramic kiln dam mold, it is COE agnostic. Load the interior with frit, billets, or stacked sheet glass and fire so the glass fuses within the square dam. The mold is reusable across many firings when prepped and cared for properly.

What does the Patty Gray 4 Inch Square Dam Casting Mold make?
It casts one flat square glass piece measuring 4 inches by 4 inches per firing. The finished piece suits tile work, mosaic elements, jewelry blanks, or decorative cast panels.

What is a dam casting mold?
A dam mold is an open-bottomed ceramic frame that sits on a prepared kiln shelf. You load glass into the interior, and as it fires the glass fuses to fill the square inner area. The kiln shelf forms the flat back of the finished piece.

How much glass do I need?
Creative Paradise lists about 205 grams for a full fill using multiple stacked layers. Weigh your glass and test a first run when the result matters, as fill weight varies with the thickness you want the finished piece to be.

What COE glass can I use in this mold?
Any COE. Ceramic dam 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?
Prime the kiln shelf and the interior edges of the dam 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 adding glass so the cast piece releases cleanly.

Specifications

• SKU: 161200
• Manufacturer: Creative Paradise (CPI.GM180)
• Makes: 1 square cast glass piece per firing
• Finished piece size: 4 inches x 4 inches
• Mold size: 4.75 inches L x 4.75 inches W
• Inner dimensions: 4 inches L x 4 inches W
• Suggested fill weight: about 205 grams (multiple stacked layers)
• Material: ceramic kiln dam 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 casting schedule suited to your glass and kiln.

• Prime the kiln shelf and the interior edges of the dam with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before adding glass so the cast piece releases cleanly.
• Load the interior with frit, billets, or multiple stacked layers of sheet glass. Creative Paradise suggests about 205 grams for a full fill.
• The mold is COE agnostic. Use a firing schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the cast piece. Re coat the mold and kiln shelf 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 for multiple layers of glass, not a guarantee. Every kiln fires differently. Test a small run and adjust the schedule for your glass and kiln.

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

Helpful downloads: Rock Footed Self Standing Votive Tutorial (PDF) · Patty Gray Mold Tutorial (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

Spot an error or have feedback on this description? Report it here.