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fast cooling

For discussion of processes related to using Bullseye glass, including kilnforming and kilncasting, torchwork, blowing and stained glass.

fast cooling

Postby dr sawfish » Fri Sep 24, 2010 3:37 am

how safely/fast can i cool down from annealing temp in degrees c? my kiln is 60w x 60l x 25h centimeters
dr sawfish
Posts: 61
Joined: Sun Jan 31, 2010 5:29 am

Re: fast cooling

Postby bertglass » Fri Sep 24, 2010 10:54 am


The answer depends on the glass not the kiln.

Study the Bullseye chart for annealing thick glass. This chart shows times for various thicknesses. The chart is for glass with uniform thickness, cooling with one surface on a shelf. The times change if the glass has varying thickness or is cooling from more than one side.

I recommend always programming the controller to go down to 300ºF (150ºC) before shutting off. Follow the directions in the Bullseye charts. You are far better off, having the controller not turning on when the kiln is too hot, than the other way around.
Bert Weiss
Posts: 83
Joined: Sat Jan 30, 2010 10:58 am

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