The Bullseye Small Double Curve slumping mold, design number 8960, is a ceramic forming mold with outer dimensions of 9.4 by 8.7 by 1.7 inches. A pre-cut glass sheet or fused blank is placed over the mold surface and fired so the softened glass settles by gravity into the double curve shape. The result is a piece that bends in two directions, suitable as a small decorative vessel, a shallow bowl form, or a component for further kiln work.
Slipcast from a specially formulated clay body by Creative Ceramics in Europe and imported and sold by Bullseye Glass, the mold has an exceptionally smooth surface that accepts kiln wash uniformly and does not crack under repeated proper use. Like all ceramic slumping forms it is COE agnostic, so the same mold works with COE90, COE96, or other fusible glass. The outer dimensions listed are for checking kiln fit; because these molds are handmade they vary slightly in size, so measure your specific mold before cutting your glass blank.
What shape does this mold produce?
What size glass blank do I need?
What COE glass can I use?
How do I prep the mold before slumping? Hotline Primo Primer and let it dry completely before placing your glass. A boron nitride mold primer can also be used in place of kiln wash. Re-coat as needed between firings.
Specifications
SKU: 6852Manufacturer: Bullseye Glass (slipcast by Creative Ceramics, Europe; imported and sold by Bullseye Glass)Bullseye design number: #8960Bullseye item number: 008960-MOLD-M-EACHStore model code: BG8960Shape: Small Double Curve slumping moldMold outer dimensions: 9.4 x 8.7 x 1.7 in (24 x 22 x 4 cm)Material: ceramic kiln slumping mold, reusableGlass: any COE (COE agnostic)
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.
Place your pre-cut glass sheet or fused blank over the mold surface. The glass will soften and drape into the double curve during firing; do not force it against the form beforehand.
The mold is COE agnostic. Match your firing schedule to the glass you are using and adjust the anneal soak temperature for your COE if needed.
Because these molds are handmade and vary slightly in size, always measure your specific mold before cutting your glass blank.
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 based on slumping 6mm pieces in a Paragon GL24 kiln, not a guarantee. Every kiln fires differently and glass styles vary in viscosity. Visually confirm the slump during firing and adjust as needed.
Segment Rate (F/hr) Temp (F) Hold 1 (slump ramp) 300 1220 :10 2 (anneal soak) AFAP 900 1:00 3 (anneal cool) 100 700 none 4 (final cool) AFAP 70 none
AFAP means as fast as possible (the kiln drops at its natural rate, door closed). Segment 2 is the anneal soak; adjust this temperature for your specific glass COE if needed. Visually confirm the glass has fully settled into the mold before moving to the anneal cool stage.
Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)
Description updated: July 6, 2026
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