Bullseye Glass Mold #8665, Soup Bowl 9.4"

The Soup Bowl mold, Bullseye design #8665, is a 9.4 inch ceramic slumping form made to shape a sheet glass blank into a shallow bowl profile. The outer footprint measures 9.4 inches in diameter and 1.6 inches deep (24 by 4 cm). These molds are handmade and vary slightly in size, so measure the mold before cutting glass to confirm it fits your kiln shelf.

The form is slipcast from a specially formulated clay body by Creative Ceramics in Europe, then imported and sold by Bullseye Glass. Its surface accepts kiln wash uniformly and will not crack under repeated proper use. Like all ceramic slumping forms, it is COE agnostic: place a pre-made glass sheet or fused blank over the mold, heat the kiln to slumping temperature, and gravity draws the softened glass down into the bowl shape.

What does the Soup Bowl mold make?
It slumps a glass blank into a shallow bowl shape roughly 9.4 inches across. It suits functional bowls, display pieces, or forms intended for further cold working.

How does slumping work with this mold?
A pre-cut glass sheet or fused blank is placed over the mold surface. As the kiln reaches slumping temperature, the glass softens and gravity pulls it down to conform to the bowl profile. The glass must already be a formed piece sized to cover the mold; this is not a frit casting mold.

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

How do I prep the mold before slumping?
Coat the forming surface with kiln wash or a boron nitride separator and let it dry completely before placing glass. Re-coat as needed between firings to prevent sticking.

Specifications

• SKU: 5104
• Manufacturer: Bullseye Glass (made by Creative Ceramics; design #8665, item 008665-MOLD-M-EACH; store model code BG8665)
• Form: Soup Bowl, 9.4 inch
• Outer dimensions: 9.4 inches diameter x 1.6 inches deep (24 x 4 cm)
• Note: Molds are handmade and vary slightly in size; measure before cutting glass.
• 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 with kiln wash or a boron nitride separator such as ZYP Boron Nitride Mold Primer, and let it dry completely before placing glass.
• Prepare a glass blank sized to sit over the mold. The outer mold diameter is 9.4 inches; cut the blank to cover the form and allow for the full slump into the bowl profile.
• The mold is COE agnostic. Adjust the anneal soak temperature for your glass: about 900 F for COE90 or 950 F for COE96.
• Visually confirm the slump is complete during firing. Glass viscosity varies by style, so the hold time at slumping temperature may need adjustment.
• Let the kiln cool fully before removing the slumped piece. Re-coat the forming surface 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 slumping guidance for your glass and mold, and test a small piece first.

*AFAP means as fast as possible: the kiln drops at its natural rate with no ramp restriction. The anneal soak in segment 2 is set for COE90 (Bullseye glass). If using COE96, adjust the anneal soak temperature to 950 F. Segment 4 means letting the kiln cool at its natural rate, door closed, to room temperature.

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

Description updated: July 6, 2026

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