Bullseye Glass Mold #8758, Square Nesting Plate 7"

The Square Nesting Plate 7 inch mold from Bullseye (design number 8758) is a kiln slumping form that shapes a pre-made glass sheet or fused blank into a square nesting plate. The outer footprint is 7 by 7 by 0.8 inches (18 by 18 by 2 centimeters), which is the dimension to check when planning kiln placement. These molds are handmade, so individual pieces vary slightly in size. Measure your specific mold before cutting glass to fit.

Slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported by Bullseye Glass, the form has an exceptionally smooth surface that accepts kiln wash uniformly and holds up under repeated proper use without cracking. Like all ceramic kiln forms, it is COE agnostic, so the same mold works with COE90, COE96, or other fusible glass. Match your slumping schedule to the glass you are using.

What does the Square Nesting Plate 7 inch mold make?
It slumps one square nesting plate per firing. A pre-made fused blank or cut sheet glass is placed over or onto the form, then heated so the glass softens and takes the plate shape by gravity.

How do I size the glass for this mold?
The listed outer mold dimensions are 7 by 7 inches, but because these molds are handmade they vary slightly in size. Measure the forming surface of your specific mold before cutting glass rather than relying on the listed dimensions.

What COE glass can I use with this mold?
Any COE. Ceramic slumping molds are COE agnostic, so COE90, COE96, and other fusible glasses all work in the same mold. Use a slumping schedule matched to your glass type and adjust the anneal soak temperature for your COE.

How do I prep the mold before firing?
Coat the forming surface with a kiln wash such as Hotline Primo Primer or a shelf primer and let it dry completely before placing the glass. Re-coat as needed between firings.

Specifications

• SKU: 159241
• Manufacturer: Bullseye Glass (BG8758, made by Creative Ceramics, imported by Bullseye)
• Makes: one square nesting plate per firing
• Outer mold dimensions: 7 x 7 x 0.8 inches (18 x 18 x 2 cm)
• Note: molds are handmade and vary slightly in size; measure before cutting glass
• Material: slipcast ceramic kiln slumping mold, 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 with kiln wash or a shelf primer such as ZYP Boron Nitride Mold Primer and let it dry fully before placing the glass.
• Place a pre-cut glass blank or sheet glass over or onto the mold. Because molds are handmade, measure your specific mold before cutting glass rather than relying on the listed outer dimensions.
• Slump at the lowest temperature that fully forms the glass. Confirm the slump visually during firing and adjust for your kiln and glass type.
• Let the kiln cool to room temperature before opening or removing the glass. 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, not a guarantee. Every kiln fires differently. Follow Bullseye's published guidance for your glass and mold, test a small piece first, and confirm the slump visually during firing.

AFAP = as fast as possible (maximum rate your kiln can achieve). Segment 4 is a natural cool with the kiln door closed; do not open the kiln until the glass has fully cooled to room temperature.

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

Description updated: July 6, 2026

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