The Round Tray slumping mold from Bullseye Glass (design number 8760) is a shallow ceramic form sized to slump a flat glass sheet into a round serving tray shape in a single firing. The outer mold measures 13.3 inches in diameter and 1 inch deep (34 by 3 cm), which are the dimensions to check against your kiln shelf for fit. Because these molds are handmade by Creative Ceramics in Europe, they vary slightly in size, so measure your actual mold before cutting your glass blank.
To use the form, place a pre-cut glass sheet or a previously fused blank over the mold surface, then fire it on a slow ramp until the glass softens and gravity settles it into the tray shape. The mold is slipcast from a specially formulated clay body that produces an exceptionally smooth surface, accepts kiln wash uniformly, and holds up across many firings when prepped and cared for properly. Like all ceramic kiln forms, it is COE agnostic and works with any fusible glass.
What does the Round Tray 8760 mold make?
What size glass blank do I need?
What glass can I use with this mold?
How do I prep the mold before slumping?
Specifications
SKU: 165115Manufacturer: Bullseye Glass (store code BG8760; design number 8760; item number 008760-MOLD-M-EACH; molds made by Creative Ceramics, Europe)Makes: round serving trayOuter mold dimensions: 13.3 inches diameter x 1 inch deep (34 x 3 cm)Sizing note: molds are handmade and vary slightly in size; measure before cutting glassMold type: ceramic slumping form, reusableGlass: any COE (COE agnostic)
Working Notes
These are guidelines, not guarantees. Every kiln fires a little differently, so test a small piece first and follow Bullseye's published Suggested Slumping Schedule for your glass and mold depth.
Measure the mold before cutting your glass blank. These molds are handmade by Creative Ceramics and vary slightly in size.
Coat the forming surface with a kiln wash or shelf primer, such as ZYP Boron Nitride Mold Primer , and let it dry completely before placing glass so it does not stick to the form.
Place your glass sheet or fused blank over the mold surface. Slumping works by gravity: as the glass heats, it softens and settles into the tray shape.
This is a very shallow form at 1 inch deep. The slump may complete at the lower end of the temperature range. Visually confirm the glass has fully settled before beginning the cooling phase.
The mold is COE agnostic. Adjust the anneal soak temperature to match your glass: about 900 F for COE90 (Bullseye) or 950 F for COE96.
Let the kiln cool fully before removing the slumped piece. Re-coat the mold with kiln wash as needed between firings.
Bullseye Suggested Slumping Schedule
This is a suggested starting schedule, not a guarantee. Every kiln fires differently. Follow Bullseye's published Suggested Slumping Schedule for your glass and mold depth, visually confirm the slump is complete before cooling, and test a small piece first.
Step Action Target Hold 1 Ramp 300 F/hr 1225 F 0:45 2 AFAP 900 F anneal soak* 60 min 3 100 F/hr cool 700 F 0 4 AFAP, door closed Room temperature
*Anneal soak at 900 F matches Bullseye COE90 glass. If using COE96, adjust this temperature to 950 F. Use the lowest temperature that fully forms the glass, and visually confirm the slump before cooling.
Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)
Description updated: July 6, 2026
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