The Bullseye Glass Mold #7984 is a large flower slumping form that shapes a flat glass sheet into a flower-shaped dish about 11.75 inches across. The form is slipcast from a specially formulated clay body by Creative Ceramics in Europe, then imported and sold by Bullseye Glass. The surface is exceptionally smooth, accepts kiln wash uniformly, and holds up through repeated firings without cracking when used and cared for properly.
To use the form, a flat glass sheet or fused blank is placed over it on the kiln shelf. As the kiln heats, the glass softens and sags by gravity into the flower shape. The outer dimensions are 11.75 inches across and 1.0625 inches deep (about 30 by 3 cm); use these to confirm the mold fits your kiln shelf before loading. Because the forms are handmade, individual pieces vary slightly in size, so measure your specific mold before cutting the glass blank.
What does the Large Flower mold make?
What COE glass can I use in this mold?
How do I prepare the mold before slumping?
How large a glass blank do I need?
Specifications
SKU: 182017Manufacturer: Bullseye Glass (made by Creative Ceramics, Europe); design number 7984, item number 007984-MOLD-M-EACH, store code BG7984Makes: large flower-shaped slumped glass dishFinished piece size: approximately 11.75 inches acrossMold outer dimensions: 11.75 inches x 1.0625 inches deep (30 x 3 cm)Note: molds are handmade and vary slightly; measure your specific mold before cutting glassMaterial: slipcast ceramic kiln 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 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 on the form.
Set the prepared mold on the kiln shelf and place the glass blank over the form. A flat sheet or a pre-fused blank cut to the flower outline both work.
Because the forms are handmade and vary slightly in size, measure your specific mold before cutting glass blanks.
The mold is COE agnostic. Use a slumping schedule suited to your glass, and adjust the anneal soak temperature for your COE: about 900 F for COE90, about 950 F for COE96.
If your kiln has a viewport, visually confirm that the glass has fully settled into the flower shape before ending the slump hold.
Let the kiln cool fully and reach room temperature before removing the slumped piece. Re-coat the mold surface with kiln wash or primer 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, and test a small piece first.
Step Rate Temp (F) Hold 1 ~300 F/hr 1225 0:30 2 AFAP 900* 60 min 3 100 F/hr 700 - 4 AFAP Room temp -
The slump temperature in step 1 should be the lowest temperature that fully forms the glass. Start around 1225 F and adjust up if the glass does not settle completely into the flower shape. *Step 2 is the anneal soak: about 900 F for COE90, about 950 F for COE96. AFAP means as fast as possible. Keep the kiln door closed as the kiln cools to room temperature in step 4.
Helpful downloads: Suggested Slumping Schedules from Bullseye Glass (PDF)
Description updated: July 6, 2026
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