Topics: Glass supplies, Glass Frit, Slumping Mold

I placed frit into a glass mold and now the glass is stuck to the mold. How do I remove it and how do I prevent this from happening in the future. The primer I used was Hotline Hi Fire Kiln Wash and I put on 4 coats and let each coat dry between and then I cured the mold like the instructions say for that kiln wash. I have used that wash and that method many times on other molds without the glass sticking. I used a mixture of coarse/fine/medium frit in the mold and the mold I used was H20-3980TL teardrop pendant mold. I used a similar firing schedule - 500 dph to 1475F for 15 minutes and then I shut it off. That schedule has worked for other molds in the past with my kiln.

Any ideas on how to remove the glass without ruining the mold? I am going to try to fire it upside down, but I'm not sure that will remove all the glass. Thanks,
- Wendy
A suggestion for removing the glass from the mold is to carefully hit the back of a mold using a rubber mallet. If necessary, turn mold facedown and tap it against a hard surface cushioned with several layers of newsprint. If the glass still does not release then you can fire the mold upside down starting at 1000 degrees Fahrenheit. If it still does not release then take the temperature up 50 degrees until the glass releases. Next time apply additional layers of kiln wash or try using glass separator, an alternative to the Hotline Hi Fire Kiln Wash.

A successful firing schedule used with the slumping molds is:

Ramp 1 - 900 degrees Fahrenheit/hour to 1000 degrees Fahrenheit
Hold for one minute.

Ramp 2 FULL speed to 1480 degrees Fahrenheit
Hold for 15 minutes.

Ramp 3 FULL speed to 1100 degrees Fahrenheit
No hold necessary.

Ramp 4 - 300 degrees Fahrenheit/hour to 955 degrees Fahrenheit
Hold for 15 minutes.

Allow the kiln to cool to room temperature, or no higher than 100 degrees Fahrenheit, before opening and removing the mold.

- Tammy Honaman, Author, Jewelry-Making Expert and Educator

  • Kiln wash
  • Glass separator

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