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Lesson Plans

Re: Kiln

[ Thread ][ Subject ][ Author ][ Date ]
Wed, 14 Oct 1998 17:19:26 EDT

A quick answer to your kiln firing question. A bisque fire of earthenware
clay can be done at a lower temp than 05. Cone 010 saves time and money.
Depending on the size of the kiln, the age of the elements and the amount of
greenware stacked in the kiln your timing of raising switches from low med to
high will vary. Getting a pyrometer to gauge temperature rise will help.
Generally for the average 27" x 23" round electric kiln with an average load,
I fire on "low" for about 2 hours or until the temp has risen to about 400F.
I then go to Med for another hour and half or until the temp reaches about
900F. Then switch to high for the until the cone melts which will be about
another 6 hours.

I use a down draft negative pressure vent system which is on the entire fire
cycle. I close the lid tight from the start. If the kiln is hood vented, I
would leave the lid open a crack for the first hour to allow steam to escape.

Hope this helps

Bill R.
Souhegan High School.