Bullseye Glass Mold #8725, Lamp Bender 10.1" Slumping Mold

The Lamp Bender slumping mold from Bullseye Glass, design 8725, is a ceramic form for bending flat glass sheets into the curved panels used in stained glass lamp shade construction. A prepared glass sheet or fused blank is placed over the mold surface, then fired so the glass softens and drapes to the form's shape by gravity, producing a curved piece ready for lamp assembly.

The outer footprint of this mold is 10.1 inches by 8.5 inches with a depth of 3.7 inches, giving each panel a substantial curve suited to lamp shade ring assembly. The mold is slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported by Bullseye Glass. Its surface is exceptionally smooth, accepts kiln wash uniformly, and does not crack under repeated proper use. Like all ceramic slumping molds it is COE agnostic, so the same form works with COE96, COE90, or any other fusible glass matched to a compatible firing schedule.

What does the Lamp Bender mold make?
It slumps flat glass sheets or fused blanks into curved panels for stained glass lamp shade assembly. The mold outer footprint is 10.1 inches by 8.5 inches with a 3.7 inch depth.

How do I use a slumping mold?
Coat the mold surface with kiln wash or a boron nitride primer and let it dry completely. Cut your glass to fit, place it over the mold, and fire to the slump temperature so the glass softens and drapes to the form by gravity. Let the kiln cool fully before removing the slumped piece.

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

How do I determine how much glass to cut?
These molds are handmade and individual pieces may vary slightly from the listed outer dimensions. Always measure your specific mold before cutting glass rather than relying solely on the nominal 10.1 by 8.5 inch footprint.

Specifications

• SKU: 4166
• Manufacturer: Bullseye Glass (design 8725, item 008725-MOLD-M-EACH; store model BG8725)
• Makes: curved lamp panels for stained glass lamp shade assembly
• Mold outer dimensions: 10.1 inches L x 8.5 inches W x 3.7 inches D (26 x 22 x 10 cm)
• Material: slipcast ceramic, made by Creative Ceramics in Europe, imported by Bullseye Glass
• Surface: exceptionally smooth, accepts kiln wash uniformly, 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 mold surface with kiln wash or a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, and let it dry completely before placing your glass.
• These molds are handmade and vary slightly in size. Measure your specific mold before cutting glass.
• Place the prepared glass sheet over the mold surface. The glass softens and drapes to the form during firing.
• The mold is COE agnostic. Match your firing schedule and anneal soak temperature to the glass you are using.
• Let the kiln cool fully before removing the slumped piece. Reapply kiln wash or primer 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. Visually confirm the slump during firing and adjust the schedule for your glass, mold depth, and kiln.

AFAP means as fast as possible, letting the kiln cool at its natural rate with the door closed. Segment 4 brings the kiln to room temperature naturally. Adjust the anneal soak temperature for your glass COE if needed.

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

Description updated: July 6, 2026

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