Is Lincoln 60 really a fireclay? Simple physical testing says...

Friday 22nd August 2014

Materials are not always what their name suggests. These are Lincoln #60 insight-live.com/glossary/229">Fireclay test bars fired at cone 10 reduction (top) and from cone 11 down to 6 oxidation (top to bottom). This clay already has stoneware density at cone 7 (3% porosity as indicated by our SHAB test). It vitrifies progressively from there upward (less than 3% porosity at cone 7 to near zero% by cone 9 oxidation. Maximum firing shrinkage happens at cone 8 and by cone 10 it is expanding (indicating decomposition has started) and it is bloating by cone 11 (melting is sealing the escape of gases of decomposition). Is Lincoln #60 a really fireclay? Absolutely not! But at cone 6 it is a credible plastic stoneware, all by itself!

Pages that reference this post in the Digitalfire Reference Library:

Lincoln 60 Fireclay, Fireclay, Stoneware

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