This feldspar melts by itself to be a glaze, but crazes badly

Tuesday 29th July 2014

Pure MinSpar insight-live.com/material/310">feldspar fired at cone 6 on Plainsman M370 porcelain. Although it is melting, the crazing is extreme! And expected. Feldspars contain a high percentage of K2O and Na2O (KNaO), these two oxides have the highest thermal expansion of any oxide. By far! Thus, glazes high in feldspar (e.g. 50%) are likely to craze. Using a little glaze chemistry, it is often possible to substitute some of the KNaO for another fluxing oxide having a lower thermal expansion.

Pages that reference this post in the Digitalfire Reference Library:

Minspar 200, Feldspar, Na2O, Feldspar Glazes, Glaze Crazing

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