David Hendley on wed 10 mar 99
At 04:04 PM 3/9/99 EST, you wrote:
>----------------------------Original message----------------------------
>
> Might one glaze be acceptable on one body and not on another? If
>this is the case, can one really "evaluate" a glaze simpy by looking at
>its formulae?
Yes, and yes, since the formula also yields the expansion.
I don't know of a way to measure claybodies, other than just
trying them to see what you get, but the process is not hard.
To try out a new claybody just pick out 3 of the glazes you use:
the one with the lowest expansion, one that is of 'average'
expansion, and the one with the highest expansion.
(You will have this information from the glaze calculation
program, although it can be, and used to be, done by hand).
Make some test bars and glaze them with the 3 glazes.
After firing, see what you've got.
Since glaze calculation programs quantify glaze expansion,
you now have numbers to work with.
By seeing which ones are crazed, shivered, or fit well, you have
a range of values to guide you and predict how a new glaze
will fit on that claybody.
You will also be able to formulate glazes with the proper
expansion to fit your claybody.
Or, working back the other way, you can now adjust your
claybody to fit the glazes you want to use.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
At 04:04 PM 3/9/99 EST, you wrote:
>----------------------------Original message----------------------------
>Just out of curiosity, I had always thought that glaze "fit" (ie, crazing
>and/or shivering {or lack thereof}) was also a function of the clay body
>on which it is applied and fired. The question: How do limit formulae
>take into consideration the plethora of clay bodies that are on the market
>today? Might one glaze be acceptable on one body and not on another? If
>this is the case, can one really "evaluate" a glaze simpy by looking at
>its formulae?
>
>
>Kevin A. Hluch
>102 E. 8th St
>Frederick, MD
>USA
>
>
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