Large Heart Kiln Casting Mold

The Large Heart Kiln Casting Mold from Creative Paradise casts one heart shaped piece per firing, with the finished casting measuring 3.25 inches by 3 inches. The mold footprint is 4 inches by 3.75 inches, keeping a compact profile in the kiln while producing a substantial heart form suited to pendants, wall art accents, or decorative focal pieces.

Like all ceramic casting molds, this one is COE agnostic. Fill the cavity with frit, billets, or stacked sheet scrap and fuse so the glass takes the heart shape. Creative Paradise lists 45 grams as the suggested fill weight. As a kiln casting mold it is reusable across many firings when prepped and cared for properly.

What does the Large Heart Kiln Casting Mold make?
It casts one heart shaped piece per firing, with a finished size of 3.25 inches by 3 inches. The result works well as a pendant blank, focal cabochon, or decorative wall art accent.

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 much glass do I need?
Creative Paradise lists 45 grams per firing. Fill weight can vary with how fully you pack the cavity, so weigh your glass and test a first run when the result matters.

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: 158192
• Manufacturer: Creative Paradise (CPI.LF29)
• Makes: 1 heart casting
• Finished piece size: 3.25 inches L x 3 inches W
• Mold size: 4 inches L x 3.75 inches W
• Suggested fill weight: 45 grams
• 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, small billets, or stacked sheet scrap. For a tack fired surface, the manufacturer suggests powder and fine frit filled uniformly to about a quarter inch.
• The mold is COE agnostic. Use a full fuse 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.
• 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.

Full Fuse (COE96):

Tack Fire (COE96): for a tack fired surface, fill uniformly to about a quarter inch with powder and fine frit.

*Segment 4 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Helpful downloads: Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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