Four North American ball clays fired at high temperature

Wednesday 25th July 2012

The top bars went to insight-live.com/glossary/125">cone 10R, the others are cone 11 and 10 oxidation (downward from top). They are Gleason, Spinks Blend, OM#4 and NP Blend. It is amazing now similar different ball clays fire in the kiln. Clearly, soluble salts are an issue with all of them (the brownish scum). These bars are much cleaner on the backsides (since the solubles were left on the surface on the fronts during drying). The drying shrinkages, plasticities and fired maturities are also all remarkably similar.

Pages that reference this post in the Digitalfire Reference Library:

Ball Clay, Porcelaineous Stoneware, Ball Clay

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.