Patty Gray Dam Kiln Casting Mold

The Patty Gray Small Rectangle Dam mold from Creative Paradise contains glass within an inner cast area of 10 inches by 4.25 inches during firing. The outer mold footprint measures 11 inches by 5 inches with a diagonal of 12.25 inches. Loading frit, crushed glass, billets, or stacked sheet glass inside the dam walls and firing to a full fuse produces a flat rectangular slab with clean, contained edges, ready for cutting, coldworking, or use as a finished tile or panel section.

Creative Paradise suggests about 465 grams of glass for a full fill. Like all ceramic casting molds, this dam is COE agnostic and reusable across many firings when prepped and cared for properly.

What does the Patty Gray Small Rectangle Dam mold make?
It produces a flat rectangular glass slab cast within an inner area of 10 inches by 4.25 inches. The finished slab can be used as a tile, cut into smaller pieces, or coldworked after firing.

What is a dam mold and how does it work?
A dam mold uses ceramic walls to contain glass within a defined footprint during firing. Glass loaded inside the dam walls, whether frit, crushed glass, billets, or stacked sheet, melts and fuses into a flat slab that matches the shape of the inner cavity.

How much glass does this mold need?
Creative Paradise lists a fill weight of about 465 grams. The amount varies with how thick a slab you want, so weigh your glass and test a first run when the result matters.

What COE glass can I use with this dam mold?
Any COE. Ceramic casting 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.

Specifications

• SKU: 169205
• Manufacturer: Creative Paradise (CPI.GM242)
• Makes: flat rectangular glass slab
• Inner cast area: 10 inches L x 4.25 inches W
• Mold size: 11 inches L x 5 inches W
• Diagonal: 12.25 inches
• Suggested fill weight: about 465 grams
• Material: ceramic kiln casting 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 inner dam area 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 glass does not stick.
• Fill with frit, crushed glass, billets, or stacked sheet scrap. Layer the glass evenly within the dam walls to achieve a consistent slab thickness.
• 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 slab. Re coat the dam 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.

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: Patty Gray Mold Instructions (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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