Ivor and Olive Lewis on sat 3 dec 05
I think this should be treated as a Technical Problem.
First, what temperature will human skin and flesh withstand before =
subcutaneous damage is sustained. Perhaps a limit of 45=BA Celsius. At =
50=BA C Protein begins to denature (cook !)How will a person know that =
all of the ware in the kiln is at or below this temperature.
Second, if you know the Physical Characteristics of your fired wares and =
its Chemistry: Rates of Thermal Conductivity as will as Specific Heat =
and Thickness it is possible to calculate or estimate the Internal =
Temperature of the ware as well as Predict Thermal Phase Changes.
Well I don't. So I leave my kiln to cool naturally until the pyro =
reading is room temperature.
The analogy of Scones may seem to be a good one. But there are =
differences between dehydrated flour, cream and sugar and the multi =
phase product that comes from your kiln
One final point. If ware is taken from the kiln in a hot state and it =
shows crazing or dunting, how can a person determine the cause or cure =
the problem ? ?
When in Doubt, Don't !
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Jean Cochran on sat 3 dec 05
Dear Ivor and All Who Replied,
I didn't! Good sense prevailed. Sometimes it's hard to use good sense =
when
all one's instincts say "Open it, open it!"
Thank you so much.
By the way I left your whole reply in this message because it all makes
logic when viewed together, not to mention a bit of ironic humor.=20
Jean Wadsworth Cochran
www.foxhollowpottery.com
www.kycraft.ky.gov/craftcgi-bin/index.cgi?busid=3D186
First, what temperature will human skin and flesh withstand before
subcutaneous damage is sustained. Perhaps a limit of 45=BA Celsius. At =
50=BA C
Protein begins to denature (cook !)How will a person know that all of =
the
ware in the kiln is at or below this temperature.
Second, if you know the Physical Characteristics of your fired wares and =
its
Chemistry: Rates of Thermal Conductivity as will as Specific Heat and
Thickness it is possible to calculate or estimate the Internal =
Temperature
of the ware as well as Predict Thermal Phase Changes.
Wel
One final point. If ware is taken from the kiln in a hot state and it =
shows
crazing or dunting, how can a person determine the cause or cure the
problem ? ?
When in Doubt, Don't !
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Graeme Anderson on mon 5 dec 05
Thanks for the info., Ivor.
"First, what temperature will human skin and flesh withstand before
subcutaneous damage is sustained. Perhaps a limit of 45=BA Celsius. At 50=BA=
C
Protein begins to denature (cook !)How will a person know that all of the
ware in the kiln is at or below this temperature."
I just thought I was getting old. Now I know that my brains have been
fried by being out in our midday sun in summer - the temp. often hits the
50 C mark. Today it was 43 C, and officially summer is only 4 days old.
Hurry on autumn.
Cheers. Graeme.
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