lyla kaplan on mon 9 sep 02
Hi. I know it is possible to really crank up the gas and get to temp in a few hours. What is the fastest one can go, both up and down? Also, would you care to share your own fast firing/fast cooling schedules? I have gone to cone 6 in a 3 c ft electric-converted-to-soda kiln in five hours (with a trial run that incluced exploding my cone packs - duh!). In about 4 hours it's already down to 500 degrees F. Only one piece has shown the stress of fast cooling, however, otherwise the glazes don't seem affected by it, and the soda is pretty well dispersed.
Thanks,
Lyla in Michigan
imagine
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John Hesselberth on tue 10 sep 02
Hi Lyla,
The answer is pretty fast if you are only interested in glossy glazes or=20=
unmelted, less-than-durable mattes. But to get high quality, durable=20
glazes that are matte you must cool slowly--at least from 1900F down to=20=
about 1500F--that part of the cycle by itself should be 3 hours or=20
more. These glazes are matte because they contain lots of tiny crystals=20=
and crystals take time to grow. There is lots more in the archives on=20=
this if you will search on a term like "slow cooling" you will probably=20=
find quite a bit of information.
There are also some other reasons why slow heating and/or cooling can be=20=
beneficial--those are often specific to the composition of your body,=20
the size and shape of your piece and the cone to which you fire. Most of=20=
us have learned the hard way not to push too hard on heating or cooling=20=
rates if we want the highest chances of success.
Regards,
John
http://www.frogpondpottery.com
http://www.masteringglazes.com
On Monday, September 9, 2002, at 10:58 AM, lyla kaplan wrote:
> Hi. I know it is possible to really crank up the gas and get to temp =
in=20
> a few hours. What is the fastest one can go, both up and down? Also,=20=
> would you care to share your own=A0fast firing/fast cooling schedules? =
I=20
> have gone to cone 6 in=A0a 3 c ft electric-converted-to-soda kiln in =
five=20
> hours (with a trial run that incluced exploding my cone packs=20
> -=A0duh!).=A0=A0=A0In about 4 hours it's already down to 500 degrees =
F. Only=20
> one piece has shown the stress of fast cooling, however,=A0otherwise =
the=20
> glazes don't seem affected by it, and the soda is pretty well =
dispersed.
>
> Thanks,
>
> Lyla in Michigan
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> Join the world=EDs largest e-mail service with MSN Hotmail. Click Here
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