what temp to soften glass so gravity makes it flow

I have a large ceramic kiln and I want to experiment with glass.

Here's what I'm trying to do. I want to lay some glass vodka bottles on
their sides and get them hot enough so that gravity acting on them will make
them flat/collapse. I don't want the glass to melt into a liquid puddle, but
just have the glass get hot enough so that the bottle collapses to nearly
flat.

Anybody know what temperature I need to bring the glass bottles up to so
they'll do this? I also assume I'll need to bring the temperature up/down at
a certain rate so that the glass will not crack when heating/cooling?

Thanks

-T


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Depends on the bottle. Gray Goose bottles are really thick at the bottom and
need to be cooled really slowly. take 'em up to about 1550 (every kiln is
different) at 500degrees/hour, then drop 'em to 1200 (again, 500 degrees/hr,
hold for a couple hours, drop to 900, hold for a couple hours, then shut 'er
down. Whole thing takes about 24- 36 hours until shut off.m


"TT" wrote in message
news:d8G3d.52235$9Y5.17452@fed1read02...
I have a large ceramic kiln and I want to experiment with glass.

Here's what I'm trying to do. I want to lay some glass vodka bottles on
their sides and get them hot enough so that gravity acting on them will
make
them flat/collapse. I don't want the glass to melt into a liquid puddle,
but
just have the glass get hot enough so that the bottle collapses to nearly
flat.

Anybody know what temperature I need to bring the glass bottles up to so
they'll do this? I also assume I'll need to bring the temperature up/down
at
a certain rate so that the glass will not crack when heating/cooling?

Thanks

-T


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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"Michele Blank" wrote in message
...
Depends on the bottle. Gray Goose bottles are really thick at the bottom
and
need to be cooled really slowly. take 'em up to about 1550 (every kiln is
different) at 500degrees/hour, then drop 'em to 1200 (again, 500
degrees/hr,
hold for a couple hours, drop to 900, hold for a couple hours, then shut
'er
down. Whole thing takes about 24- 36 hours until shut off.m


"TT" wrote in message
news:d8G3d.52235$9Y5.17452@fed1read02...
I have a large ceramic kiln and I want to experiment with glass.

Here's what I'm trying to do. I want to lay some glass vodka bottles on
their sides and get them hot enough so that gravity acting on them will
make
them flat/collapse. I don't want the glass to melt into a liquid puddle,
but
just have the glass get hot enough so that the bottle collapses to
nearly
flat.

Anybody know what temperature I need to bring the glass bottles up to so
they'll do this? I also assume I'll need to bring the temperature
up/down
at
a certain rate so that the glass will not crack when heating/cooling?

Thanks

-T


Can't you bring it up to 1500 or so and just flatten the bottle with a
piece of steel plate with a handle? It would save many hours of waiting.

--
JK Sinrod
Sinrod Stained Glass Studios
www.sinrodstudios.com
Coney Island Memories
www.sinrodstudios.com/coneymemories

On Mon, 20 Sep 2004 19:47:17 GMT, Michele Blank wrote:
Depends on the bottle. Gray Goose bottles are really thick at the bottom and
need to be cooled really slowly. take 'em up to about 1550 (every kiln is
different)

1550 seems pretty high if your goal is just to slump the bottle. Does
bottle glass really need a temp that much higher than, say, float, which
full fuses around 1560, tack fuses around 1430, and slumps somewhere below
that? Or are you going for the "slump really fast, vent really fast, hope
you don't get a phone call at the wrong time" schedule?

--
#macro R(L P)sphere{L __}cylinder{L P __}#end#macro P(_1)union{R(z+_ z)R(-z _-z)
R(_-z*3_+z)torus{1__ clipped_by{plane{_ 0}}}translate z+_1}#end#macro S(_)9-(_1-
_)*(_1-_)#end#macro Z(_1 _ __)union{P(_)P(-_)R(y-z-1_)translate.1*_1-y*8pigment{
rgbS(7)S(5)S(3)}}#if(_1)Z(_1-__,_,__)#end#end Z(10x*-2,.2)camera{rotate x*90}

Michele Blank wrote:

Depends on the bottle. Gray Goose bottles are really thick at the bottom and
need to be cooled really slowly. take 'em up to about 1550 (every kiln is
different) at 500degrees/hour, then drop 'em to 1200 (again, 500 degrees/hr,
hold for a couple hours, drop to 900, hold for a couple hours, then shut 'er
down. Whole thing takes about 24- 36 hours until shut off.m

"TT" wrote in message
news:d8G3d.52235$9Y5.17452@fed1read02...
I have a large ceramic kiln and I want to experiment with glass.

Here's what I'm trying to do. I want to lay some glass vodka bottles on
their sides and get them hot enough so that gravity acting on them will
make
them flat/collapse. I don't want the glass to melt into a liquid puddle,
but
just have the glass get hot enough so that the bottle collapses to nearly
flat.

Anybody know what temperature I need to bring the glass bottles up to so
they'll do this? I also assume I'll need to bring the temperature up/down
at
a certain rate so that the glass will not crack when heating/cooling?

Thanks

-T


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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Go up about 500/hr to around 1500F. Check on the bottle every so often
after you hit 1400. When soft the bottle will flatten in a matter of
minutes. Drop as fast as possible to around 960 and soak for about an
hour. Bring to room temp over the next 3 hours.
--
Jack


http://photos.yahoo.com/bc/xmissionbobo/

Michele Blank wrote:

Depends on the bottle. Gray Goose bottles are really thick at the bottom and
need to be cooled really slowly. take 'em up to about 1550 (every kiln is
different) at 500degrees/hour, then drop 'em to 1200 (again, 500 degrees/hr,
hold for a couple hours, drop to 900, hold for a couple hours, then shut 'er
down. Whole thing takes about 24- 36 hours until shut off.m


The hold at 1200 will serve no purpose. Also, above 1000 you can move
that temp as fast as you want.

--
Jack


http://photos.yahoo.com/bc/xmissionbobo/

jk wrote:



Can't you bring it up to 1500 or so and just flatten the bottle with a
piece of steel plate with a handle? It would save many hours of waiting.

--
JK Sinrod
Sinrod Stained Glass Studios
www.sinrodstudios.com
Coney Island Memories
www.sinrodstudios.com/coneymemories

When you reach temp the bottle will flatten in a matter of minutes.
--
Jack


http://photos.yahoo.com/bc/xmissionbobo/

Maybe not for a standard bottle but you look at a gg vodka bottle and you'll
see why i recommend that. I misspoke 24-36 hours. takes less than that
unless you wait till cool. You do NOT want to flash cool a gray goose bottle
to 960!!! regular wine bottles can be cranked up full bore to 1500, then
shut down to cool, no stops, no slow ramps. it's those dang GG bottles that
mess with you!m
"nJb" wrote in message
...
Michele Blank wrote:

Depends on the bottle. Gray Goose bottles are really thick at the bottom
and
need to be cooled really slowly. take 'em up to about 1550 (every kiln
is
different) at 500degrees/hour, then drop 'em to 1200 (again, 500
degrees/hr,
hold for a couple hours, drop to 900, hold for a couple hours, then shut
'er
down. Whole thing takes about 24- 36 hours until shut off.m


The hold at 1200 will serve no purpose. Also, above 1000 you can move
that temp as fast as you want.

--
Jack


http://photos.yahoo.com/bc/xmissionbobo/

Michele Blank wrote:

Maybe not for a standard bottle but you look at a gg vodka bottle and you'll
see why i recommend that. I misspoke 24-36 hours. takes less than that
unless you wait till cool. You do NOT want to flash cool a gray goose bottle
to 960!!! regular wine bottles can be cranked up full bore to 1500, then
shut down to cool, no stops, no slow ramps. it's those dang GG bottles that
mess with you!m

My bottle slumping days are over, I just get the vodka bottles empty for
the slumpers. I'll have to get a Grey Goose bottle just to see if I can
thermally shock it above 1000F.

I have a small slab in right now. 8"x12"x1". I'll have it out in
slightly less than 24 hours.

--
Jack


http://photos.yahoo.com/bc/xmissionbobo/

again, the problem lies in the fact that the bottom is really, really, thick
but the rest of the bottle is thin like wine bottles. i do these to support
my habit. www.bottlemeltdown.com if anyone is interested. m
"nJb" wrote in message
...
Michele Blank wrote:

Maybe not for a standard bottle but you look at a gg vodka bottle and
you'll
see why i recommend that. I misspoke 24-36 hours. takes less than
that
unless you wait till cool. You do NOT want to flash cool a gray goose
bottle
to 960!!! regular wine bottles can be cranked up full bore to 1500, then
shut down to cool, no stops, no slow ramps. it's those dang GG bottles
that
mess with you!m

My bottle slumping days are over, I just get the vodka bottles empty for
the slumpers. I'll have to get a Grey Goose bottle just to see if I can
thermally shock it above 1000F.

I have a small slab in right now. 8"x12"x1". I'll have it out in
slightly less than 24 hours.

--
Jack


http://photos.yahoo.com/bc/xmissionbobo/