Patty Gray 6" Dam Casting Mold

The Patty Gray 6 inch Dam Casting Mold from Creative Paradise is a square ceramic dam that holds stacked or layered glass in place as it fuses in the kiln. The inner cavity measures 6.25 inches by 6.25 inches and sits 0.75 inches deep, so loaded glass consolidates into a slab that fills that footprint. The outer mold body is 6.75 inches by 6.75 inches with dam walls 1 inch tall, and the diagonal spans 9.5 inches.

The dam method is straightforward: arrange layers of sheet glass, frit, or billets inside the cavity to reach the suggested fill weight of 385 grams, fire to a full fuse, and the glass merges into a flat square slab. Like all ceramic casting molds, this one is COE agnostic and can be refired with COE96, COE90, or other compatible fusible glass across many sessions when prepped and cared for properly.

What does the Patty Gray 6 inch Dam Casting Mold make?
It produces a flat square glass slab measuring 6.25 inches by 6.25 inches and up to 0.75 inches deep, cast from stacked layers or frit loaded into the dam cavity and fused in one firing.

What is a dam mold and how does it work?
A dam is a ceramic frame that sits on the kiln shelf and surrounds the glass as it heats and melts. The walls contain the molten glass and give the finished slab clean, defined edges that match the inner dimensions of the dam.

How much glass do I load?
Creative Paradise lists a suggested fill weight of 385 grams. Stack your glass to that weight and run a test firing when the result matters, as glass density and layer arrangement can affect the outcome.

What COE glass can I use?
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.

How do I prep the mold before casting?
Coat the inner walls and floor 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 loading glass so the cast slab releases cleanly.

Specifications

• SKU: 162071
• Manufacturer: Creative Paradise (CPI.GM123)
• Makes: 1 square glass slab
• Finished piece size: 6.25 inches L x 6.25 inches W x 0.75 inches deep
• Mold size: 6.75 inches L x 6.75 inches W x 1 inch T
• Diagonal: 9.5 inches
• Suggested fill weight: 385 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 inner walls and floor 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 slab releases cleanly.
• Load the cavity with stacked sheet offcuts, billets, or frit to reach the suggested 385 gram fill weight. Arrange layers evenly so the glass melts into a uniform slab.
• The mold is COE agnostic. Use a full fuse 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 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.

Multiple Layers Full Fuse (COE96):

*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) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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