Patty Gray 6" Round Dam Casting Mold

The Patty Gray 6 inch Round Dam Casting Mold from Creative Paradise is a ring-style kiln casting mold that casts a single round glass piece 6 inches in diameter. The outer ring measures 6.5 inches across, and the interior holds 358 grams of glass for a full casting. It is a practical way to produce thick, flat-backed round cast glass pieces for wall panels, large cabochons, or decorative rounds.

Dam molds work differently from cavity molds: the ceramic ring sits on a prepared kiln shelf and glass is loaded inside the ring. As the kiln heats, the glass fuses and flows to fill the circular area defined by the dam, taking the round form. Like all ceramic casting molds, this one is COE agnostic and reusable across many firings when prepped and cared for properly.

What does this dam mold cast?
It casts one flat-backed round glass piece, 6 inches in diameter, per firing. The finished piece works well as a large cabochon, a decorative wall round, or a panel insert.

How does a dam mold differ from a cavity mold?
A dam mold is a ceramic ring that sits on the kiln shelf rather than an enclosed mold with formed cavities. Glass is loaded inside the ring and fuses to fill the area the ring defines. The prepared kiln shelf forms the flat back of the finished piece.

How much glass do I need?
Creative Paradise lists 358 grams per casting. Weigh your glass and test a first run when the result matters, as actual fill weight can vary with how thick you want the finished piece.

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

Specifications

• SKU: 162075
• Manufacturer: Creative Paradise (CPI.GM183)
• Makes: 1 round cast glass piece
• Finished piece size: 6 inches diameter
• Mold size: 6.5 inches diameter (outer ring)
• Suggested fill weight: 358 grams
• Material: ceramic kiln casting 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 inside the ring and the inner face of the dam with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash such as Hotline Primo Primer, and let it dry completely before adding glass so the cast piece releases cleanly.
• Load the glass inside the dam ring. The manufacturer's schedule is designed for multiple layers of COE96 glass. Fill to your desired thickness, keeping the total weight to about 358 grams.
• The mold is COE agnostic. Use a firing schedule matched to your glass and adjust the anneal soak temperature for your COE.
• Let the kiln cool fully before removing the cast 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.

Full Fuse (COE96, multiple layers):

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

Helpful downloads: Dam Kiln Casting Mold Instructions (PDF) · Mermaid Fountain Tutorial (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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