12 Hearts Casting Mold

The 12 Hearts Casting Mold from Creative Paradise casts twelve heart shaped pieces in a single firing, with each finished heart measuring 2 inches long by 1.5 inches wide. The twelve cavities sit in a square mold footprint of 9.25 inches by 9.25 inches, making it an efficient way to produce a large batch of heart shaped glass pieces for jewelry, decorative accents, or mosaic work at once.

Like all ceramic casting molds, this one is COE agnostic. Fill the cavities with frit, small billets, or stacked sheet scrap and fuse to the heart shape. The manufacturer lists roughly 31 grams of glass per cavity. As a kiln casting mold it is reusable across many firings when prepped and cared for properly.

What does the 12 Hearts Casting Mold make?
It casts twelve heart shaped pieces, each 2 inches long by 1.5 inches wide, in one firing. They are well suited to jewelry pendants, earring components, ornaments, and decorative or mosaic accents.

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 per heart?
Creative Paradise lists about 31 grams per cavity. Fill weight varies with how full you want each heart, so weigh your glass and test a first run when the result matters.

How do I prep the mold before casting?
Coat the cavities 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: 176747
• Manufacturer: Creative Paradise (CPI.LF241)
• Makes: 12 heart shaped pieces
• Finished piece size: 2 inches L x 1.5 inches W each
• Mold size: 9.25 inches L x 9.25 inches W x 1.5 inches T
• Suggested fill weight: about 31 grams per cavity
• 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 cavities 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 pieces. 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: Firing Notes (PDF) · LF241 Opaline Pocket Hearts (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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