Bullseye Glass Mold #8747, Classic Bowl 8.5"

The Classic Bowl mold from Bullseye Glass, design number 8747, is a slumping form that shapes glass into a shallow round bowl about 8.5 inches in diameter. The outer mold dimensions are 8.5 inches by 0.9 inches (22 by 2 centimeters), so you can confirm kiln fit before cutting glass. These molds are handmade from a specially formulated slipcast clay body, so individual pieces vary slightly in size, and measuring the mold before cutting your glass blank is always the right first step.

The form is made by Creative Ceramics in Europe and imported and sold by Bullseye Glass. The slipcast clay body produces an exceptionally smooth forming surface that accepts kiln wash uniformly, so primer goes on evenly and the mold holds up well across many firings when properly cared for. To use it, place a pre-cut or pre-fused glass blank over the form and fire it slowly so the softening glass settles by gravity into the bowl shape.

What does the Classic Bowl 8747 mold make?
It slumps a round glass bowl about 8.5 inches in diameter. The finished depth depends on the glass thickness and how the glass settles into the form during firing.

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

How do I size the glass for this mold?
Because these molds are handmade and vary slightly in size, measure the mold before cutting the glass. A blank sized close to the outer mold diameter is a common starting point; adjust for how deep you want the finished bowl.

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 the glass. The slipcast surface accepts kiln wash uniformly, making prep straightforward.

Specifications

• SKU: 5106
• Manufacturer: Bullseye Glass (design #8747, item 008747-MOLD-M-EACH; made by Creative Ceramics, imported by Bullseye)
• Store model code: BG8747
• Makes: 1 classic round glass bowl
• Finished piece size: about 8.5 inches in diameter
• Mold outer dimensions: 8.5 in L x 0.9 in H (22 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.

• These molds are handmade and vary slightly in size. Measure the mold before cutting your glass blank.
• Coat the forming surface with kiln wash or a boron nitride mold primer such as ZYP Boron Nitride Mold Primer and let it dry completely before placing the glass.
• Place a pre-cut glass blank or a pre-fused piece over the mold. The glass softens and slumps by gravity into the bowl shape during firing.
• The 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, 950 F for COE96).
• Let the kiln cool fully before removing the finished bowl. Re-coat the forming surface with kiln wash as needed between firings.

Bullseye Suggested Slumping Schedule

This is a suggested starting schedule for slumping 6mm glass in a Paragon GL24 kiln, not a guarantee. Every kiln fires differently and glass styles vary in viscosity. Visually confirm the slump during firing and adjust as needed.

AFAP means as fast as possible. Segment 4 is a natural kiln cool to room temperature with the door closed. The anneal soak at 900 F (Segment 2) is matched to COE90 glass such as Bullseye; if using COE96 glass, adjust Segment 2 to 950 F.

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

Description updated: July 6, 2026

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