Bullseye Glass Mold #8721, Plain Plate 14.6" Slumping Mold

The Plain Plate 14.6 inch Slumping Mold from Bullseye Glass (design number 8721) forms a single flat plate by gravity slumping. A pre-cut glass sheet or fused blank is placed over the ceramic form, then heated until the glass softens and drapes into the plate profile. The outer mold dimensions are 14.6 inches by 1.2 inches (37 by 3 cm), and these figures are for checking kiln fit. Because these molds are handmade, individual pieces vary slightly in size, so measure your specific mold before cutting glass.

The form is slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported by Bullseye Glass. The forming surface is exceptionally smooth and accepts kiln wash uniformly. It does not crack under repeated proper use, making it a durable part of a slumping setup. As a ceramic mold it is COE agnostic, so it works equally well with COE90, COE96, or other fusible glass; match your firing schedule to the glass you are using.

What does the Plain Plate 14.6 inch mold make?
It forms a single flat plate from a pre-cut glass sheet or fused blank. The glass is laid over the form and the heat of the kiln softens it until it settles into the plate shape by gravity.

What size glass do I cut for this mold?
The outer mold dimensions are 14.6 inches by 1.2 inches (37 by 3 cm). Because these molds are handmade and vary slightly from piece to piece, measure your specific mold before cutting your glass blank to size.

What COE glass works with this mold?
Any COE. The ceramic form is COE agnostic, so it accepts COE90, COE96, or other fusible glass. Use a slumping schedule matched to your glass and adjust the anneal soak temperature for the specific COE you are using.

How do I prepare the mold before slumping?
Coat the forming surface with a kiln wash such as Hotline Primo Primer and let it dry completely before placing glass on the mold. Re-coat between firings as needed.

Specifications

• SKU: 156037
• Manufacturer: Bullseye Glass (made by Creative Ceramics, imported by Bullseye)
• Design number: 8721 (item number 008721-MOLD-M-EACH; store code BG8721)
• Makes: 1 flat plate (slumped from sheet glass)
• Outer mold dimensions: 14.6 in. x 1.2 in. (37 x 3 cm), for kiln fit
• Material: slipcast ceramic kiln 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 run first when the result matters and follow a slumping schedule suited to your glass and kiln.

• Coat the forming surface with kiln wash and let it dry completely before placing glass. You may also use a boron nitride mold primer such as ZYP Boron Nitride Mold Primer. Re-coat between firings as needed.
• The outer dimensions (14.6 by 1.2 inches) are for checking kiln fit. Because these molds are handmade, sizes vary slightly; measure your specific mold before cutting glass.
• Place a pre-cut glass sheet or fused blank over the mold. The glass softens and drapes into the plate shape as the kiln heats.
• Visually confirm the slump during firing and adjust time and temperature as needed for your kiln and glass.
• Let the kiln cool fully before removing the slumped plate. Re-coat the mold with kiln wash before the next firing.

Bullseye Suggested Slumping Schedule

This is Bullseye's suggested starting schedule for 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 and kiln.

AFAP = as fast as possible (the kiln drops at its natural rate, door closed). Segment 2 is the anneal soak at 900 F. Adjust the anneal temperature for your specific glass type and COE.

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

Description updated: July 6, 2026

Spot an error or have feedback on this description? Report it here.