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Cooling Rate Of a Kiln

Usually you don't have to know what the cooling rate of your kiln is, but certain ceramic glazes look better when cooled slowly after the kiln reaches maturity.



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Most digital controllers can slow down the cooling rate, but if you program a cooling rate that is faster than the kiln’s natural ability to cool, you may get an error message. To avoid that error message, estimate your kiln’s natural cooling rate by doing this.

During a regular firing, write down the temperature and time that your kiln fired to maturity.
Let the kiln cool naturally and every two hours write down the temperature shown on the digital controller.
If you have a switch operated kiln, you will need a pyrometer to read the temperature.


FORMULA FOR COOLING RATE

The kiln shuts off at 2200°F.
After two hours, the temperature falls to 1800°F.
2200 minus 1800 equals 400
400 divided by 2 hours equals 200

Your cooling rate would be 200° per hour.
Sometimes the cooling rate may get slower the closer the kiln gets to room temperature.

If you have a manual kiln, figure the cooling rate of your kiln using a pyrometer and the low dial on your kiln.
If your cooling rate is to fast, you would have to turn the kiln on low for a few minutes and then off, constantly checking the temperature reading on your pyrometer, until the kiln has cooled down as low as needed for the kiln load.

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