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Topic: Melting glass in kiln ?  (Read 7901 times)
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« on: December 21, 2004 08:53:36 AM »

I've seen a few commerical art pieces done in ceramic with what appeared to be melted glass pieces in the bottom (of a vase or bowl, so as not to spill out).  I was wondering if the glass needed to be fired at a specific temperature, or if it could be completed when glaze-firing a project...Also, does the glass need to be a certain type of glass? My art teacher seemed totally clueless on the subject so I wanted to gain more information before I instruct her to blow up her kiln. Wink  I have some pieces broken green wine bottles I want to melt into the bottom of a bowl for a colleague.

« Reply #1 on: December 23, 2004 04:02:45 PM »

I've had some success melting random bits of glass during the glaze firing of some of my pieces.  Things I've noticed is that the glass has a tendency to crack during the cooling process - you may be able to prevent this by cooling the kiln more slowly and/or firing the piece near the bottom of the kiln. I'm uncertain if the pieces are food safe when they have glass on them - I would play the caution card and say no.

Good luck experimenting!
« Reply #2 on: December 23, 2004 04:10:48 PM »

you should be fine incorporating glass into you piece just take the cooling ophase slow. my girlfriend uses glass in her ceramic work and also does lamp work glass. check out delphi glass for good info on fused glass process which is basicaly the same thing.
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« Reply #3 on: December 23, 2004 06:38:56 PM »

I found some general info on the temperature thing when I was trying to decide what I could do with an old lab oven I bought from a salvage place.  Unluckily, I discovered there is no temperature reading anymore on it because they rubbed off.  I haven't played with it yet other than making sure it heats.

At what temperature does glass melt?

Melting Point of Glass, the physics stuff
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« Reply #4 on: December 23, 2004 10:00:21 PM »

ok, well to start off glaze is bascly glass, just in the liquid form before it becomes shinny. we add marbles to the bottoms of our stuff all the time. just be careful that you dont put glass or marbles on the side of your projects. it will melt to the bottom of the kiln and then, good luck trying to get that sucker off. but if you want to have marbles attached to your final piece, make sure you leave a slight indent in the clay as to that spot before you glaze and fire it. after, just use a drop of super glue/nail glue to hold it in place. that should be it.

hope i helped.

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« Reply #5 on: March 05, 2005 12:06:38 AM »

Well, different types of glass will work at different temperatures.  So, I would try to find a guide on it.  Also, if your kiln does not measure the temp as it should, then I would get a thermometer.  (My art teacher just got one for her kiln)

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« Reply #6 on: April 30, 2005 07:32:18 PM »

You can melt glass at 1650 F that is cone 06.  if you fire to cone 6 and above some of the reds and yellows may burn out.  go for it though i am not here to tell you what you can't do.  if you do have something that suspends over something else (like a lidded jar) do not put a ton of glass in it the lid, it will melt through the clay and down into the jar.  The glass will crackle no matter what you do but modern dishwashers and microwaves and ovens will clean/kill any bacteria that can get into the crackles.  when you put glass into something use a bit of school glue to help hold the glass in place.  it really helps when you load a kiln and you don't have to worry about spilling your glass shards all over.  good luck!! Smiley

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« Reply #7 on: July 06, 2005 08:09:06 PM »

This strand has been so helpful.  I've recently seen something fire glass marbles on a candy dish and it turned out really lovely.  I usually fire to 06 or 04 and I'm glad to know that 06 will work.  The question is... would it be possible to put a glass marble on a flat round ceramic piece that is twice it's size.  My thought is that it might just go to the edges and then stop.  Of course it could also spill all over the place.  Thoughts?
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« Reply #8 on: July 08, 2005 12:40:08 AM »

at college our ceramics glass was in small crystals, and it melted at 1080C (we had new-fangled automatic kilns, doncha know). So maybe if you smashed up whatever glass you wanted to use? I also found that when i glazed clear over the top of the glass it went from red to blue, so be wary that the pigment of the glass can change
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