Bullseye Glass Mold #8757, Square Nesting Plate 5.5"

The Square Nesting Plate 5.5 inch mold from Bullseye Glass (design number 8757) is a slumping form that shapes a pre-cut sheet glass blank or fused piece into a shallow square plate. Place the prepared blank over the mold, load the kiln, and the glass softens and settles into the plate profile by gravity. The finished plate follows the 5.5 inch square footprint of the form.

The mold outer dimensions are 5.5 inches by 5.5 inches by 0.9 inches (14 by 14 by 2 cm). These dimensions represent the mold itself and are useful for checking kiln fit. Because the molds are handmade by Creative Ceramics in Europe from a specially formulated clay body and imported by Bullseye Glass, individual pieces can vary slightly in size, so measure the mold you receive before cutting glass. The slipcast surface is exceptionally smooth, accepts kiln wash uniformly, and holds up well through repeated firings without cracking when used properly.

What does the Square Nesting Plate 5.5 inch mold make?
It slumps a sheet glass or fused glass blank into a shallow square plate about 5.5 inches across. The nesting profile allows finished plates to stack on one another.

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

How do I size my glass blank for this mold?
Measure the mold you receive before cutting. These forms are handmade and can vary slightly from the 5.5 inch nominal size, so measure rather than relying on the listed dimension alone.

How do I prep the mold before slumping?
Coat the forming surface evenly with a kiln wash such as Hotline Primo Primer or a shelf primer and let it dry completely before placing glass. The smooth slipcast clay accepts kiln wash uniformly, which makes prep consistent across firings.

Specifications

• SKU: 159240
• Manufacturer: Bullseye Glass (design #8757, item 008757-MOLD-M-EACH; made by Creative Ceramics, imported by Bullseye)
• Store model code: BG8757
• Makes: shallow square nesting plate
• Mold outer dimensions: 5.5 x 5.5 x 0.9 in (14 x 14 x 2 cm)
• Material: slipcast ceramic slumping form, reusable
• 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 evenly with kiln wash or a shelf primer such as ZYP Boron Nitride Mold Primer, and let it dry completely before placing glass so the finished piece releases cleanly.
• Measure the mold before cutting your glass blank. Handmade dimensions can vary slightly, so measure rather than relying on the nominal 5.5 inch size.
• Place the glass blank over the mold and fire to slumping temperature. Visually confirm the slump during firing if your kiln allows, and adjust the hold time as needed for your setup.
• This mold is COE agnostic. Use a slumping schedule matched to your glass and adjust the anneal soak temperature for your COE (about 900 F for COE90 or 950 F for COE96).
• Let the kiln cool fully before removing the finished plate. Recoat the forming surface with kiln wash as needed between firings.

Bullseye Suggested Slumping Schedule

This is a suggested starting schedule for slumping 6mm pieces, based on Bullseye's published guidance for this mold tested in a Paragon GL24. Not a guarantee. Every kiln fires differently. Test a small piece first and adjust the schedule for your glass and kiln.

*AFAP = as fast as possible (drop to the target temperature at the kiln's natural rate, door closed). The anneal soak in Segment 2 is listed at 900 F, which suits COE90 glass. If you are working with COE96, adjust this soak to 950 F.

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

Description updated: July 6, 2026

Spot an error or have feedback on this description? Report it here.