Pyramid Paperweight Kiln Casting Mold

The Pyramid Paperweight Kiln Casting Mold casts one solid glass pyramid paperweight per firing. The mold base measures 5 inches on each side and stands 3.25 inches tall, and the finished cast piece measures 3 inches by 3 inches at the base.

Fill the cavity with frit, powder frit, or a combination of the two, mounding the glass above the rim since it shrinks considerably during casting. Adding dichroic frit to the fill gives the finished piece depth and color variety. Like all ceramic casting molds, this one is COE agnostic and reusable across many firings when prepped and cared for properly.

What does the Pyramid Paperweight mold make?
It casts one solid glass pyramid paperweight per firing. The finished piece measures about 3 inches by 3 inches at the base.

How much glass do I need to fill the mold?
The manufacturer lists a capacity of approximately 250 grams of frit. Glass shrinks considerably during casting, so mound the glass above the rim and fire a test piece to dial in the amount for your frit type and kiln.

What COE glass can I use in this mold?
Any COE. Ceramic casting 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 casting?
Coat the cavity 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 adding glass. Re-coat as needed between firings.

Specifications

• SKU: 5845
• Material: ceramic kiln casting mold
• Makes: 1 solid glass pyramid paperweight
• Finished piece size: 3 inches x 3 inches
• Mold base: 5 inches per side
• Mold height: 3.25 inches tall
• Suggested fill weight: approximately 250 grams of frit, mounded above the rim (test to dial in)
• Material: ceramic kiln casting 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 casting schedule suited to your glass and kiln.

• Prime the cavity with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before adding glass so the glass does not stick.
• Fill with frit, powder frit, or a mix of the two, mounding the glass generously above the rim. Glass shrinks considerably during casting, so a full mound is needed to produce a solid finished piece.
• Adding dichroic frit to the fill gives the finished piece depth and color variety in the cast glass.
• The mold is COE agnostic. Use a full fuse casting schedule matched to your glass, adjusting the final anneal soak for your COE.
• Let the kiln cool fully before removing the cast piece. Re-coat the mold with primer as needed between firings.

Description updated: July 6, 2026

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