Small Rectangle Slumping Mold

The Small Rectangle Slumping Mold from Creative Paradise shapes a pre-made glass blank into a shallow rectangle form in a single firing. The inner cavity measures 3.25 inches long by 2.5 inches wide and 0.25 inches deep, so a fused blank or sheet glass cut to that size will settle into the form and take on the rectangle shape as it softens in the kiln.

The overall mold body is 3.6 inches long by 2.6 inches wide and 1.6 inches tall, with a diagonal of 4.5 inches. Its compact footprint and modest glass requirement make it a practical starting point for fusers new to slumping, and experienced artists will find it equally useful for producing small trays, dishes, or decorative rectangle pieces. Like all ceramic slumping molds, it is COE agnostic and reusable across many firings when prepped and cared for properly.

What does the Small Rectangle Slumping Mold make?
It slumps a glass blank into a single shallow rectangle, 3.25 inches long by 2.5 inches wide, with a finished depth of 0.25 inches.

What COE glass can I use with this mold?
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.

What size blank do I need?
Cut or fuse a blank to approximately 3.25 inches by 2.5 inches to fit the inner cavity. Center it over the form before firing.

How do I prep the mold before slumping?
Coat the form 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 glass on it. Re coat as needed between firings.

Specifications

• SKU: 183111
• Manufacturer: Creative Paradise (CPI.GM281)
• Makes: 1 slumped rectangle
• Finished piece size: 3.25 inches L x 2.5 inches W x 0.25 inches deep
• Mold size: 3.6 inches L x 2.6 inches W x 1.6 inches T
• Diagonal: 4.5 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 form 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 on the mold so the glass does not stick.
• Use a pre-fused blank or sheet glass cut to approximately 3.25 inches by 2.5 inches. Center it over the form before firing.
• 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 slumped piece. 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 2 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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