Bullseye Glass Mold #8759, Square Nesting Plate 8.6"

The Bullseye Glass Mold #8759 is a square nesting plate slumping form for fusible glass. A pre-cut flat blank or pre-fused piece is placed over the form, and as the kiln heats, the glass softens and drapes into the plate shape by gravity. The mold is sized to form a square nesting plate with an 8.6 inch footprint.

The mold outer dimensions are 8.6 inches by 8.6 inches by 1 inch tall (22 by 22 by 3 cm). These are the measurements to use when checking kiln placement. Because these molds are handmade by Creative Ceramics in Europe and imported by Bullseye Glass, dimensions vary slightly from piece to piece, so measure your specific mold before cutting glass. The slipcast ceramic surface is exceptionally smooth and accepts kiln wash uniformly.

What does the Bullseye #8759 Square Nesting Plate mold make?
It slumps a single square nesting plate with an 8.6 inch footprint. A flat glass blank is placed over the form and heated until the glass softens and settles into the plate shape by gravity.

What size glass blank do I cut for this mold?
The mold outer dimensions are 8.6 by 8.6 inches. Because these molds are handmade and sizes vary slightly, measure your specific mold before cutting to get an accurate fit.

What COE glass can I use with this mold?
Any COE. This is a ceramic slumping form and is COE agnostic, so it works with COE90, COE96, or other compatible fusible glass. Match your firing schedule and anneal temperature to the glass you are using.

How do I prepare the mold before slumping?
Coat the forming surface with a kiln wash such as Hotline Primo Primer and let it dry fully before placing your glass. The smooth ceramic surface accepts kiln wash uniformly. A boron nitride spray such as ZYP can also be used as a primer.

Specifications

• SKU: 159242
• Manufacturer: Bullseye Glass (slipcast by Creative Ceramics in Europe, imported by Bullseye)
• Bullseye design number: #8759 (item number 008759-MOLD-M-EACH; store code BG8759)
• Makes: 1 square nesting plate
• Mold outer dimensions: 8.6 inches L x 8.6 inches W x 1 inch H (22 x 22 x 3 cm)
• Material: slipcast ceramic from a specially formulated clay body, reusable slumping form
• Glass: any COE (COE agnostic)

Working Notes

These are guidelines, not guarantees. Every kiln fires a little differently, so test a small piece first when the result matters and follow a slumping schedule suited to your glass and kiln.

• Coat the forming surface with kiln wash and let it dry completely before setting your glass blank in place. The smooth ceramic surface accepts kiln wash uniformly. You may also use a boron nitride mold primer such as ZYP Boron Nitride Mold Primer as an alternative.
• Because these molds are handmade, dimensions vary slightly from piece to piece. Measure your mold before cutting your glass blank.
• Place the glass blank centered over the mold. A slow initial ramp gives the glass time to heat evenly before reaching slumping temperature.
• The mold is COE agnostic. Adjust the anneal soak temperature to match your glass: about 900 F for COE90, or 950 F for COE96.
• Visually confirm the slump during firing, as glass viscosity varies by style and COE.
• Re-coat the mold with kiln wash as needed between firings.

Bullseye Suggested Slumping Schedule

This is a suggested starting schedule based on slumping 6mm pieces in a Paragon GL24 kiln, not a guarantee. Every kiln fires differently. Visually confirm the slump during firing and adjust the schedule for your glass and kiln.

AFAP means as fast as possible, letting the kiln cool at its own natural rate with the door closed. The anneal soak in Segment 2 is at 900 F, suited to COE90. If using COE96, raise this soak to 950 F. Segment 4 is a full cool to room temperature.

Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)

Description updated: July 6, 2026

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