The Convex Dish mold from Bullseye Glass (design #8932) is a ceramic slumping form that shapes a glass blank into a shallow oval dish. A pre-cut sheet or fused blank is placed over the convex surface of the mold, and as the kiln heats, the glass softens and drapes down by gravity to take the form's shape. The outer dimensions of the mold are 13.5 by 9.7 by 1.4 inches (34 by 25 by 4 cm), which is the measurement to check for kiln shelf fit before loading.
This mold is slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported and sold by Bullseye Glass. The surface is exceptionally smooth and accepts kiln wash uniformly. As a ceramic slumping form it is COE agnostic, so it works with Bullseye 90 COE glass, System 96, or other compatible fusible glass. Match your firing schedule to the glass you are using. These molds are handmade and vary slightly in size, so measure your specific mold before cutting glass.
What does the Bullseye #8932 Convex Dish mold make?
How do I use a convex slumping mold?
What COE glass works with this mold?
How do I prep the mold before firing?
Specifications
SKU: 153264Manufacturer: Bullseye Glass (design #8932; item 008932-MOLD-M-EACH; made by Creative Ceramics in Europe, imported by Bullseye)Store model code: BG8932Makes: a shallow oval convex dishMold outer dimensions: 13.5 in L x 9.7 in W x 1.4 in H (34 x 25 x 4 cm)Material: slipcast ceramic slumping form, reusableGlass: any COE (COE agnostic)Note: molds are handmade and vary slightly in size; measure before cutting glass
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 mold primer such as ZYP Boron Nitride Mold Primer , and let it dry completely before placing glass so the glass does not stick to the mold.
Place your pre-cut sheet or fused blank flat over the convex surface. The glass softens and drapes down over the form as the kiln heats.
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, about 950 F for COE96).
The outer dimensions (13.5 x 9.7 x 1.4 in) are for checking kiln fit. Because these molds are handmade and vary slightly, measure your specific mold before cutting glass.
Let the kiln cool fully before removing the formed piece. Re-coat the mold 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 Suggested Slumping Schedule for your glass and mold depth, visually confirm the slump during firing, and adjust as needed.
Segment Rate (F/hr) Temp (F) Hold (min) 1 300 1225 45 2 AFAP* 900 60 3 100 700 none 4 AFAP* 70 natural cool
*AFAP means as fast as possible. Segment 2 drops to the anneal soak; 900 F is the recommended anneal for COE90 (Bullseye glass). Adjust to 950 F for COE96. Segment 4 is a natural kiln cool with the door closed to room temperature.
Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)
Description updated: July 6, 2026
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