Patty Gray Rectangle Dam Slumping Mold

The Patty Gray Large Rectangle Dam from Creative Paradise is a ceramic dam mold that forms a flat-fused glass rectangle with inner dimensions of 13 inches by 5 inches. The dam walls contain the glass as it heats, producing a clean-edged rectangle from layered sheet glass or fusible pieces placed inside the form. The overall mold measures 13.25 inches by 5.75 inches, with a diagonal of 14.25 inches.

Creative Paradise lists a fill weight of about 710 grams for this mold. Stack layers of sheet glass inside the dam to reach that fill weight; the walls hold the glass in place as it fires and keep the edges well defined. Like all ceramic molds, this one is COE agnostic and reusable across many firings when properly prepared and cared for.

What does the Patty Gray Large Rectangle Dam mold make?
It produces a flat-fused glass rectangle with an interior of 13 inches by 5 inches. The dam walls hold the glass edges clean and defined as the layers fuse together.

What COE glass can I use in 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 much glass do I need?
Creative Paradise lists about 710 grams for this mold. Stack your layers inside the dam to reach that fill weight and test a first run when the result matters.

How do I prep the mold before firing?
Coat the interior surfaces 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 finished piece releases cleanly.

Specifications

• SKU: 161199
• Manufacturer: Creative Paradise (CPI.GM178)
• Makes: 1 flat-fused rectangle
• Inner dimensions: 13 inches L x 5 inches W
• Mold size: 13.25 inches L x 5.75 inches W
• Diagonal: 14.25 inches
• Suggested fill weight: about 710 grams
• Material: ceramic kiln 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 schedule suited to your glass and kiln.

• Prime the interior surfaces 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 piece releases cleanly.
• Stack layers of sheet glass or fusible pieces inside the dam walls to reach the 710 gram fill weight. The dam contains the glass as it fuses, keeping the edges clean and defined.
• The mold is COE agnostic. Use a schedule matched to your glass, adjusting the final anneal soak temperature for your COE.
• Let the kiln cool fully before removing the finished 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.

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: Here Comes the Sun Tutorial (PDF) · Patty Gray Mold Instructions (PDF)

Description updated: July 6, 2026

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