The Simple Rimless Dish mold from Bullseye Glass (design #8772) is a slumping form that shapes a glass sheet into a dish about 9 inches across with a clean edge and no raised rim. A prepared flat sheet or fused blank is placed over the form, then heated so the glass softens and settles into the dish shape by gravity. The rimless profile gives the finished piece a flat, open edge.
The mold 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, making consistent prep straightforward. Because each mold is made by hand, outer dimensions vary slightly from piece to piece, so measure your mold before cutting glass.
What does this mold make?
What size glass blank do I need?
What COE glass can I use?
How do I prep the mold before slumping?
Specifications
SKU: 172125Manufacturer: Bullseye Glass (made by Creative Ceramics; design #8772, item 008772-MOLD-M-EACH, store code BG8772)Makes: one simple rimless dishFinished piece size: about 9 inches acrossMold outer dimensions: 9 inches x 1.5 inches (23 x 4 cm); handmade, measure before cutting glassMaterial: slipcast clay body, reusable slumping formGlass: 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.
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 your glass so the finished piece releases cleanly.
Measure the mold before cutting your glass. Each mold is handmade, so outer dimensions vary slightly from piece to piece.
Place the prepared glass sheet over the form and center it carefully before firing.
The mold is COE agnostic. Use a slumping schedule matched to your glass and adjust the anneal soak accordingly (about 900 F for COE90, 950 F for COE96).
Visually confirm the slump is complete before cooling. Let the kiln cool fully before removing the finished dish.
Recoat the forming surface with kiln wash or primer as needed between firings.
Suggested Slumping Schedule (Bullseye Starting Point)
This is a suggested starting schedule based on Bullseye's published slumping guidance, not a guarantee. Every kiln fires differently. Follow Bullseye's published Suggested Slumping Schedule for your glass and mold depth, visually confirm the slump, and test a small piece first.
Ramp at about 300 F per hour to the slump process temperature.
The slump temperature should be the lowest temperature that fully forms the glass; Bullseye's published starting point for this mold is 1210 F. Very shallow forms may slump at lower temperatures with a faster ramp; deeper forms may need a higher temperature and a longer hold.
Hold at the slump temperature for about 20 minutes to let the glass settle fully into the form.
Cool as fast as possible (AFAP) to the anneal soak temperature: about 900 F for COE90 glass.
Hold the anneal soak for about 1 hour.
Cool at about 100 F per hour to 700 F, then cool as fast as possible to room temperature with the kiln door closed.
Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)
Description updated: July 6, 2026
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