Bullseye Glass Mold #8934, One-Square Dish 3.5"

The One-Square Dish mold from Bullseye Glass is a slumping form that shapes a pre-made glass sheet or fused blank into a small square dish about 3.5 inches across. A glass blank is set over the form and heated in the kiln until it softens and conforms to the mold by gravity. The outer mold dimensions are 3.5 by 3.5 by 0.9 inches (9 by 9 by 2 cm), a compact footprint that fits comfortably in most kilns.

The form is slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported and sold by Bullseye Glass. The surface is exceptionally smooth, accepts kiln wash uniformly, and does not crack under repeated proper use. Because these molds are handmade, dimensions vary slightly from piece to piece, so measure your specific mold before cutting your glass blank.

What does the One-Square Dish mold make?
It slumps a pre-made glass blank into a small square dish, roughly 3.5 inches across, in a single firing.

What size glass blank should I cut for this mold?
The outer mold measures 3.5 by 3.5 inches, but because these forms are handmade and vary slightly in size, measure your specific mold before cutting. Cut your blank to fit the forming surface rather than relying on the listed dimensions alone.

What COE glass can I use with this mold?
Any COE. Ceramic slumping forms 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 this mold before slumping?
Coat the forming surface with kiln wash or a boron nitride primer and let it dry completely before placing your glass blank on the form.

Specifications

• SKU: 7743
• Manufacturer: Bullseye Glass (made by Creative Ceramics, imported by Bullseye)
• Model code: BG8934
• Bullseye design number: 8934 (item number 008934-MOLD-M-EACH)
• Makes: one square slumped dish
• Finished piece size: about 3.5 inches square
• Outer mold dimensions: 3.5 in L x 3.5 in W x 0.9 in H (9 x 9 x 2 cm); handmade, dimensions vary slightly, measure before cutting glass
• Material: slipcast ceramic, 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 boron nitride primer such as ZYP Boron Nitride Mold Primer and let it dry completely before placing your glass blank.
• Place a pre-made glass sheet or fused blank over the form. The glass softens and takes the mold shape by gravity as the kiln heats.
• The mold is COE agnostic. Match your slumping schedule to the glass you are using. The anneal soak temperature varies by COE: about 900 F for COE90 glass and about 950 F for COE96.
• Visually confirm the slump during firing if your kiln allows, and adjust the hold time as needed for your glass thickness and kiln.
• Let the kiln cool fully before removing the slumped piece. Recoat the mold surface with kiln wash or primer as needed between firings.

Bullseye Suggested Slumping Schedule

This is a suggested starting schedule based on slumping 6 mm pieces in a Paragon GL24 kiln, not a guarantee. Every kiln fires differently and glass styles vary in viscosity. Follow Bullseye's published slumping guidance for your glass and mold, and test a small piece first.

Segment 2 is the anneal soak at 900 F, appropriate for COE90 glass. If using COE96, adjust this temperature to 950 F. Segment 4 is the final cool to room temperature at the kiln's natural rate with the door closed.

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

Description updated: July 6, 2026

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