Triangle Slumping Mold, Various Sizes

The Triangle Slumping Mold from Creative Paradise is a ceramic slumping form that shapes a pre-made glass sheet or fused blank into a triangular plate. It is available in three sizes, small (GM175), medium (GM174), and large (GM173), and can be ordered in whichever size suits your project. Place a prepared glass blank on the form, fire it, and gravity softens the glass into the triangular shape.

One use the manufacturer highlights is nesting: slumped plates of different sizes can be arranged together for a layered display. All three sizes share the same interior depth of 0.5 inches and the same suggested slump schedule. Like all ceramic slumping molds, they are COE agnostic and reusable across many firings when prepped and cared for properly.

What does the Triangle Slumping Mold make?
It slumps a pre-cut glass sheet or fused blank into a triangular plate. The manufacturer suggests nesting finished plates of different sizes together for added visual interest.

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

What are the dimensions for each size?
Large (GM173): mold is 9 inches L x 8.75 inches W x 0.75 inches T, inner opening 8.25 inches L x 8 inches W x 0.5 inches deep. Medium (GM174): mold is 8 inches L x 7.75 inches W x 0.75 inches T, inner opening 7.25 inches L x 7 inches W x 0.5 inches deep. Small (GM175): mold is 7 inches L x 6.75 inches W x 0.75 inches T, inner opening 6.25 inches L x 6 inches W x 0.5 inches deep.

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

Specifications

• SKU: 158187
• Manufacturer: Creative Paradise (CPI.GM173-175)
• Makes: triangular slumped glass plates
• Available sizes: small, medium, large (choose one)
• Large (GM173) mold size: 9 inches L x 8.75 inches W x 0.75 inches T
• Large inner dimensions: 8.25 inches L x 8 inches W x 0.5 inches deep
• Medium (GM174) mold size: 8 inches L x 7.75 inches W x 0.75 inches T
• Medium inner dimensions: 7.25 inches L x 7 inches W x 0.5 inches deep
• Small (GM175) mold size: 7 inches L x 6.75 inches W x 0.75 inches T
• Small inner dimensions: 6.25 inches L x 6 inches W x 0.5 inches deep
• 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 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 on the form so the glass does not stick.
• Cut a glass sheet or fused blank to fit the interior opening of the size you are using, then set it on the prepared form.
• The mold is COE agnostic. Use a slump schedule matched to your glass, adjusting the final anneal soak for your COE.
• The suggested schedule below is for a double layer of COE96 glass. Adjust hold times and peak temperature for your kiln and glass thickness.
• Let the kiln cool fully before removing the slumped piece. Re-coat the mold with primer as needed between firings.

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, double layer):

*Segment 3 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Helpful downloads: Nested Christmas Trees Tutorial (PDF)

Description updated: July 6, 2026

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