Cheryl L Litman on fri 13 aug 99
I've been making forms which have entrapped air pockets and after using 4
different claybodies, I have had no explosions firing them either in the
bisque or in the glaze. Another myth I guess.
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
Corinne P. Null on sat 14 aug 99
Cheryl,
Air pockets are not a problem with clay, except if they contain moisture.
It is water trapped in an air pocket that causes the blowouts one hears so
much about - when it reaches boiling temperature at 212 F. I often will
hold the kiln at 150 F (allowing for deterioration of thermocouple and
inaccuracy of pyrometer readings) for a long time if I suspect drying
problems.
Corinne Null
Bedford, New Hampshire
null@mediaone.net
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.UKY.EDU]On Behalf
Of Cheryl L Litman
Sent: Friday, August 13, 1999 3:44 PM
To: CLAYART@LSV.UKY.EDU
Subject: myth: firing with entrapped air
----------------------------Original message----------------------------
I've been making forms which have entrapped air pockets and after using 4
different claybodies, I have had no explosions firing them either in the
bisque or in the glaze. Another myth I guess.
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
Mike Bailey on sat 14 aug 99
In message , Cheryl L Litman writes
>----------------------------Original message----------------------------
>I've been making forms which have entrapped air pockets and after using 4
>different claybodies, I have had no explosions firing them either in the
>bisque or in the glaze. Another myth I guess.
>
Dear Cheryl,
Yes, and another myth that is put about by pottery teachers and ceramic
technicians is that it's air pockets, left in the work by the
'incompetent' student, that is the cause of the student's work blowing
up. In practice, its due to work being firing too fast - just not
allowing enough time for the water to get out of the clay.
Cheers,
Mike.
--
Mike Bailey. Bath. U.K.
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