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Glass - Kiln Casting and Slumping

Meagan Chaney Gumpert - Thursday, August 20, 2009
Finished up these tile plaques this week. This series of 6" x 6" x 1" plaques incorporates kiln cast glass and slumping, so I thought I'd share a couple pictures of the glass process today.

Finished Wall Plaques
Unfired glass stacked into steel molds. The molds are lined with fiber paper so the castings wont stick. Yes, I use the same L&L ceramics kiln to fire both ceramics and fused glass, and it works beautifully! I do have separate sets of selves, and 2 different types of kiln wash (aka shelf primer) though.
Kiln castings after being fired to 17250F. Interested in my glass firing schedule?
Check it out here.
In my kiln, this firing is set to Program #5. The kiln castings after the glass has been taken out of the mold and cleaned up a bit. Each "brick" is between 1/2" to 1" thick. Slicing the cast "bricks" with a table top tile saw.
(My least favorite part of the process. So loud and messy!)But it's worth it! The colors and patterns of the glass castings are revealed after they are sliced open. They've always reminded me of geodes. Once I have the slices, they 're cut down to size with a hand held glass cutter/scoring tool. The windows are also coated with the same primer/kiln wash that is on the shelves. This allows the glass to slump through the clay opening with minimal stress and cracking on the glass.

The pre-fired, glazed tiles are loaded into the kiln upside down, with the glass covering the window opening. They are then fired to 1300oF.
This is Glass Firing Program #2 .
After firing, the kiln wash/shelf primer is cleaned off with a damp sponge and the glass is glued back in with 100% silicone adhesive.
Here's a tile without the steel backing.
Well, there's a very quick runthough of what I've been up to this week in the studio. If you have any questions about any part of this process, please just let me know. I'm happy to share info!

Cheers!


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