Pure Custer Feldspar and Nepheline Syenite on cone 10R porcelain bodies

Monday 17th October 2016

These were applied to the bisque as a slurry (suspended by gelling with powdered or dissolved epsom salts). The nepheline is thicker. Notice the crazing. This is what feldspars do. Why? Because they are high in K2O and Na2O, these oxides have by far the highest thermal expansions. So if a glaze is high in feldspar it should be no surprise that it is going to craze also.

Pages that reference this post in the Digitalfire Reference Database:

Feldspar, Nepheline Syenite, Feldspar applied as a glaze? Yes! The way I did it will change how you glaze., Crazing

This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.