Linda Knapp on fri 15 nov 02
Is there any way to calculate the clay expansion ratio without analysis?
Is it related to shrinkage in any useful way perhaps?
Linda
Ababi on fri 15 nov 02
If you make it yourself, use Insgight or Matrix or any other program if not ask the
supplier!
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
---------- Original Message ----------
>Is there any way to calculate the clay expansion ratio without analysis?
>Is it related to shrinkage in any useful way perhaps?
>Linda
>______________________________________________________________________________
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Craig Martell on fri 15 nov 02
Linda asked:
>Is there any way to calculate the clay expansion ratio without analysis?
>Is it related to shrinkage in any useful way perhaps?
Hi Linda and the rest of you folks:
This has been discussed before and the answer is no. Ron Roy is the dude
who knows this stuff very well. He does calculated expansion stuff and
also actual analyses of expansion using a dilatometer. His conclusion is
that the dilatometer is the only way to get an acurate expansion value.
Shrinkage has nothing to do with this. Shrinkage and expansion are two
different things. Once a piece of claywork has been fired, all the
shrinkage, plastic and firing, is done. Expansion is basically a thermal
activity and is ongoing, as in never finished. It just keeps happening.
regards, Craig Martell Hopewell, Oregon
David Beumee on fri 15 nov 02
Dear Linda,
There is a way to find out if the expansion of your clay body is high, low, or balanced, without the use of a dilitometer,but if a specific
calculated number is what you need, dilitometry is the only way.
Jim Robinson's Glaze Test Series of ten high to low expansion glazes is an excellent way to find out the expansion charactistics of a cone 10 clay
body, and Mastering Cone Six Glazes by Hesselberth and Roy has a series of five low to high expansion glazes to test the expansion of cone six clay
bodies. What is it that you need?
David Beumee
Earth Alchemy Pottery
Lafayette, CO
11/15/02 1:32:18 AM, Linda Knapp wrote:
>Is there any way to calculate the clay expansion ratio without analysis?
>Is it related to shrinkage in any useful way perhaps?
>
>Linda
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
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