The Large Teardrop mold from Bullseye Glass forms a teardrop-shaped slumped dish by softening a pre-cut or fused glass blank over the form in the kiln. The outer mold measures 10.625 inches by 7.5 inches by 1.375 inches deep, and those are the dimensions to check against your kiln shelf before cutting glass. As the kiln reaches slumping temperature, gravity draws the softened glass down into the teardrop outline of the form.
The mold is slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported by Bullseye Glass. Its exceptionally smooth forming surface accepts kiln wash uniformly and holds up through repeated firings when cared for properly. Like all ceramic slumping forms, it is COE agnostic: use it with COE90, COE96, or other fusible glass by matching the slumping schedule and anneal soak to the glass you are using. Because these molds are handmade, sizes vary slightly, so measure your specific mold before cutting glass.
What does the Large Teardrop mold make?
What size glass blank do I need?
What COE glass can I use?
How do I prep the mold before slumping? Hotline Primo Primer or a shelf primer and let it dry completely before placing glass on the mold. Recoat as needed between firings to prevent the glass from sticking to the surface.
Specifications
SKU: 153707Manufacturer: Bullseye Glass (store code BG8533, design #8533, item 008533-MOLD-M-EACH), slipcast by Creative Ceramics in EuropeMakes: teardrop-shaped slumped glass dishOuter mold dimensions: 10.625 inches L x 7.5 inches W x 1.375 inches deep (270 mm x 190 mm x 35 mm)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 shelf primer such as ZYP Boron Nitride Mold Primer and let it dry completely before placing glass on the mold.
These molds are handmade and vary slightly in size. Measure your mold before cutting your glass blank, and confirm the blank fits your kiln layout before firing.
Place the prepared glass blank over the mold on a kiln-washed shelf. The glass will soften and settle into the teardrop form as the kiln reaches slumping temperature.
The mold is COE agnostic. Match your slumping schedule and anneal soak to the glass you are using: about 900 F for COE90 or about 950 F for COE96.
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 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 is complete, and test a small piece first.
Ramp at about 300 F per hour to the slump process temperature. Use the lowest temperature that fully forms the glass, commonly about 1225 to 1250 F for a standard slump; cooler and faster for very shallow forms, hotter and slower for deeper forms.
Hold about 10 minutes at the slump temperature to let the glass settle fully into the form. Longer holds may be needed for deeper forms.
Cool as fast as possible (AFAP) to the anneal soak temperature: about 900 F for COE90 or about 950 F for COE96. Hold the anneal soak for about 1 hour.
Cool at about 100 F per hour from the anneal soak down to 700 F, then cool 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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