Coaster Slumping Mold

The Coaster Slumping Mold from Creative Paradise slumps a flat glass blank into a square coaster with a shallow circular well, 3.75 inches in diameter and 0.25 inches deep, sized to cradle the base of a standard drink glass. The outer mold footprint is 5 inches by 5 inches with a diagonal of 7.25 inches, and the form stands 1.75 inches tall.

Like all ceramic molds, this one is COE agnostic. Cut or prepare a glass blank to fit the mold opening, lay it over the form, and fire to a slump schedule matched to your glass. The heat softens the blank and gravity settles it into the circular well, producing a coaster with a recessed center that holds a drink glass in place. As a ceramic kiln mold it is reusable across many firings when prepped and cared for properly.

What does the Coaster Slumping Mold make?
It slumps one square glass coaster per firing, with a circular well 3.75 inches in diameter and 0.25 inches deep that fits the base of a standard drink glass.

What size glass blank should I use?
Size your blank to fit within the 5 inch by 5 inch mold opening. A plain sheet cut to size or a pre-fused piece both work. Lay it over the form before firing so it slumps evenly into the circular well.

What COE glass can I use in this mold?
Any COE. Ceramic slumping molds are COE agnostic, so this 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 (for example ZYP) or a kiln wash such as Hotline Primo Primer, and let it dry completely before placing the glass. Re coat as needed between firings.

Specifications

• SKU: 6780
• Manufacturer: Creative Paradise (CPI.GM44)
• Makes: 1 square glass coaster per firing
• Inner dimensions: 3.75 inches Dia. x 0.25 inches Deep
• Mold size: 5 inches L x 5 inches W x 1.75 inches T
• Diagonal: 7.25 inches
• Material: ceramic kiln 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 slump 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 the glass so it does not stick.
• Cut a blank to fit the 5 inch by 5 inch mold opening and lay it over the form. The blank softens during firing and settles into the 3.75 inch circular well by gravity.
• The mold is COE agnostic. Use a slump schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the coaster. Re coat the mold with primer as needed between firings.
• The Slide Hi Temp brand separator is not recommended with these molds.

Creative Paradise Suggested Firing Schedule

This is a suggested COE96 starting schedule, not a guarantee. Every kiln fires differently. Test a small run and adjust the schedule for your glass and kiln.

Slump (COE96):

*Segment 9 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Description updated: July 6, 2026

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