Bullseye Glass Mold #8949, Medium Rectangle 11.4" x 9.1"

The Bullseye Glass Mold #8949 is a medium rectangle slumping form with an outer footprint of 11.4 inches by 9.1 inches and a height of 1.3 inches. A pre-cut sheet or fused glass blank is placed over or set into the form and heated in the kiln so the glass softens and sags by gravity into the mold shape, producing a gently curved rectangular piece suited to plates, small trays, and decorative panels.

Made by Creative Ceramics in Europe from a specially formulated clay body, the mold is imported and sold by Bullseye Glass. The surface is exceptionally smooth and accepts kiln wash uniformly. Because these molds are handmade and vary slightly in size, measure your specific mold before cutting glass rather than relying on the listed dimensions alone.

What does the Bullseye #8949 mold make?
It slumps a rectangular piece of glass into a gently curved form. The outer mold footprint is 11.4 by 9.1 inches. Measure your specific mold before cutting glass, since each piece is handmade and may vary slightly.

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

How do I prepare the mold before firing?
Coat the forming surface with a kiln wash such as Hotline Primo Primer or a suitable shelf primer and let it dry completely before placing glass on the mold. The smooth surface accepts kiln wash uniformly.

What size glass blank do I need?
Measure your specific mold directly before cutting. The outer dimensions are listed as 11.4 by 9.1 inches, but individual molds vary slightly since they are handmade.

Specifications

• SKU: 152523
• Manufacturer: Bullseye Glass (slipcast by Creative Ceramics in Europe, imported by Bullseye)
• Model code: BG8949 (design #8949, item 008949-MOLD-M-EACH)
• Makes: slumped glass rectangle
• Mold outer size: 11.4 in L x 9.1 in W x 1.3 in H (29 x 23 x 3 cm)
• Material: ceramic slumping form, slipcast clay body, 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 completely before placing glass.
• Place your pre-cut sheet or fused blank over or into the mold. Measure the mold directly before cutting glass, since individual sizes vary slightly for these handmade forms.
• This mold is COE agnostic. Use a slumping schedule matched to your glass and adjust the anneal soak temperature for your COE.
• Visually confirm the slump during firing. Let the kiln cool fully before removing the slumped piece.
• Recoat 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 kiln, not a guarantee. Every kiln fires differently. Follow Bullseye's published slumping guidance for your glass and mold depth, and test a small piece first.

AFAP means as fast as possible. Segment 2 is the anneal soak at 900 F, suited to COE90 glass. Adjust to about 950 F for COE96. Segment 4 is a natural 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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