OWLPOTTER@AOL.COM on sat 27 apr 02
Ron,You recently wrote in a Clayart post:
It is a bad cone 10 body because it is short of KNaO (sodium and potassium
oxides) which are needed to combat cristobalite. I would expect problems at
cone 8 as well. Don't expect clays labeled 8 to 10 to work well at both
temperatures - you are asking the impossible.
So, what would be acceptable (good) percentages of K(2)O and Na(2)O for a
typical cone 8 claybody?
The two clays I am using have very little, I think:
Foundry Hill Creme has Na(2)O of 0.20% and K(2)O of 0.70%.
Kentucky Stone has Na(2)O of 0.20% and K(2)O of 1.30%.
Thank you.
-Carolynn Palmer, Somerset Center, Michigan
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