Large Oval Knobs Casting Mold

The Large Oval Knobs mold from Creative Paradise casts two oval glass knobs in a single firing, with each finished knob measuring 2.5 inches long by 1.75 inches wide. The mold footprint is 4.75 inches by 3.5 inches, and the two cavities produce a pair of knobs at once, ready for hardware mounting when the firing is complete.

Like all ceramic casting molds, this one is COE agnostic. Fill the cavities with frit, billets, or stacked sheet scrap and fuse to the oval knob shape. Note that Fiberfrax kiln shelf paper is required for this project. As a kiln casting mold it is reusable across many firings when prepped and cared for properly. Hardware for mounting the finished knobs is sold separately.

What does the Large Oval Knobs mold make?
It casts two oval glass knobs, each 2.5 inches long by 1.75 inches wide, in one firing. The finished pieces are sized for use as cabinet or drawer knobs with standard mounting hardware.

Why is Fiberfrax required for this project?
Fiberfrax kiln shelf paper is a required supply for this mold. Follow the project instructions provided with the mold for how to use it during firing.

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 cavities with a kiln shelf primer such as a boron nitride spray 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: 12990
• Manufacturer: Creative Paradise (CPI.LF56)
• Makes: 2 oval knobs
• Finished piece size: 2.5 inches L x 1.75 inches W each
• Mold size: 4.75 inches L x 3.5 inches W
• Suggested fill weight: about 29 grams per cavity
• Required supply: Fiberfrax kiln shelf paper
• 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.
• Fiberfrax kiln shelf paper is required for this project. Follow the project instructions for placement before and during firing.
• Fill with frit, 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.
• Hardware for mounting the finished knobs is sold separately.
• 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: Knobs and Pulls Tutorial (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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