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Glass Slumping Coffee Jars
Glass slumping test results:
Over in the Glass Art Group we've got a challenge going on, so I thought I'd have a test go at glass slumping in my kiln.
Reusing coffee jars for the glass slumping test, the kids first curled some shapes using glass rods, heated over a candle flame, under supervision as they can get jolly hot and burn! That was a bit of fun as it's not as easy to curl the rods as you might imagine.
We stood one coffee jar up in the kiln, just to see what would happen. I thought it had actually melted and stuck to the side of the kiln, but it hadn't - it had touched the side then shrunk away, but left it with a sharp edge, so that's now in the bin.
The two jars we laid on their side flattened well, with a slight bump where the inserted shapes were.
This video shows you the results :
Over in the Glass Art Group we've got a challenge going on, so I thought I'd have a test go at glass slumping in my kiln.
Reusing coffee jars for the glass slumping test, the kids first curled some shapes using glass rods, heated over a candle flame, under supervision as they can get jolly hot and burn! That was a bit of fun as it's not as easy to curl the rods as you might imagine.
We stood one coffee jar up in the kiln, just to see what would happen. I thought it had actually melted and stuck to the side of the kiln, but it hadn't - it had touched the side then shrunk away, but left it with a sharp edge, so that's now in the bin.
The two jars we laid on their side flattened well, with a slight bump where the inserted shapes were.
This video shows you the results :
Tags: coffee jars, glass art, glass slumping, reusing glass
Comment
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Comment by huda on December 18, 2009 at 5:50pm -
Wonderful job
I love art glass
I have a kiln for ceramics similar to it
thank you Diane Stafford
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Comment by veena on December 16, 2009 at 2:56am - wow!!!!!!!!!this is so nice
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Comment by Diane Stafford on December 15, 2009 at 5:31am - I bought my kiln second hand when I lived in Spain so it wasn't as expensive as buying a new one. You could look around for a second hand one. They are hundreds of pounds/dollars, but depends on size and fuel. Mine is electric so is quite expensive to run.
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Comment by Eric on December 14, 2009 at 11:07pm - Thats cool. Are kilns expensive? Id like to get one someday.
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Comment by Grant on December 11, 2009 at 8:44pm - In that case, I'll gather some further fun crafty places for when you're down our way.
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Comment by Diane Stafford on December 11, 2009 at 7:29am
- Grant, Brilliant glass work over at ten green bottles website. I like the community and recycling aspects to what they are doing. :-)
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Comment by Grant on December 10, 2009 at 10:35pm
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When you pop over this way, you may like to visit Ten Green Bottles in New Radnor Village.
This is a bit of their work:
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Comment by Diane Stafford on December 10, 2009 at 7:03am
- A little more testing to do yet Grant, and yes it's certainly fun :)
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Comment by Grant on December 9, 2009 at 8:35pm
- Fun
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Comment by Diane Stafford on December 7, 2009 at 12:14pm
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Hi Rubina, I followed this kiln firing sequence:
Fire the kiln to 1100F and soak for 10 minutes. The rate of temperature increase should be from around 500 degrees per hour is recommended, I did this a little quicker, per 30 minutes without problems.
Some people fire as fast as 800 degrees per hour, but be aware that the faster you fire the more likely the bottle is to crack from thermal shock. The purpose of the 10 minute soak is to allow the temperature of the glass to equalize and to all reach 1100F.
Continue firing the kiln at 250 degrees per hour to 1300F, then fire as fast as your kiln will go to 1475F. Hold the temperature constant at 1475F until the bottle has slumped to the degree you want. Usually this takes around 10 minutes.
Cool the kiln to 1100F as fast as possible. - At this point - I just turned everything off and lifted the kiln lid holding it open for a short time, then when I guestimated that it was cooled enough I closed the lid and left everything to cool down slowly overnight. My kiln cools very slowly, so it's ideal for leaving to cool on its own.
You can read the whole of this article/ tutorial at Glass Warm Tips about Bottle Slumping
Di :-)
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