Square Shelf Ring Slumping Mold

The Square Shelf Ring Slumping Mold from Creative Paradise is a 10 inch by 10 inch ceramic ring designed to work directly against the kiln shelf to produce a flat-bottomed plate. A pre-made fused blank or sheet glass is placed on top of the ring and, as the kiln heats, the center of the glass softens and drops down to rest against the shelf, forming a uniformly flat bottom while the ring defines and supports the outer edge. The diagonal of the ring measures 14 inches.

Because the kiln shelf itself creates the flat bottom, the result is a plate with a true flat base, which makes it well suited to functional ware, display platters, and serving pieces. Like all ceramic slumping molds, this one is COE agnostic and reusable across many firings with proper priming between uses.

What does the Square Shelf Ring Slumping Mold make?
It produces a flat-bottomed square plate. A glass blank placed over the ring slumps down to rest on the kiln shelf inside the ring, giving the finished piece a uniformly flat base shaped by the shelf itself.

How does a shelf ring slumping mold work?
The ceramic ring sits on the kiln shelf and a glass blank rests on top of it, spanning the opening. As the kiln heats, the glass softens and gravity pulls the center down to the shelf surface. The ring supports and defines the outer edge of the plate while the shelf creates the flat bottom.

What COE glass can I use?
Any COE. Ceramic slumping molds are COE agnostic, so the same mold works with COE96, COE90, or other fusible glass. Match your firing schedule to the glass you are using.

How do I prep the mold before slumping?
Coat the mold surface with a kiln shelf primer such as a boron nitride spray or a kiln wash such as Hotline Primo Primer, and let it dry completely before placing glass. Re-coat between firings as needed.

Specifications

• SKU: 164828
• Manufacturer: Creative Paradise (CPI.GM233)
• Makes: flat-bottomed square plate
• Mold size: 10 inches L x 10 inches W
• Diagonal: 14 inches
• Material: ceramic slumping mold, reusable
• Glass: any COE (COE agnostic)

Working Notes

These are guidelines, not guarantees. Every kiln fires a little differently, so test a small run first when the result matters and follow a slumping schedule suited to your glass and kiln.

• Prime the mold surface with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before placing glass so the glass does not stick to the mold.
• Place a pre-made fused blank or cut sheet glass over the ring so it spans the opening. As the glass softens, the center slumps down to rest on the kiln shelf, forming the flat bottom of the plate inside the ring.
• The mold is COE agnostic. Use a slumping schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the slumped piece. Re-coat the mold with primer as needed between firings.

Helpful downloads: MultiDimensional Tutorial (PDF)

Description updated: July 6, 2026

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