wschran@erols.com on sat 14 aug 99
I agree, for the most part. A vast majority of the time, air pockets
will not cause a ceramic form to expload in the kiln. Trapped water
(such as in the bottom of a piece) & too rapid a rise in temperature
are the usual culprits. But, a larger entrapped void, such as between
slabs of clay, can trap water as it tries to escape as steam, and will
blow out a section of the work, even though the work seems to be dry.
After 23 years teaching, I can often spot those works which may be
subject to kinetic action in the kiln, but not always. Usually have 2-3
works blow out their bottoms or lose a side each year.
Bill
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