Stoneware mug endures thermal shock better than kaolin or ball clay


Wednesday 27th July 2016

These are fired at cone 10R. The kaolin bowl on the left survived 2 seconds! The ball clay next to it: 4 seconds. The Helmer clay (halloysite/kaolin) next to that: 8 seconds. The white stoneware piece: 14 seconds. A commercial stoneware mug could survive for 50 seconds or better. Thermal shock resistance is a complex subject. Of course, the size, thickness and contour of the ware are important. But many other factors come into play: quartz particle content and size, degree of maturity, thermal expansion of the matrix, homogeneity of the matrix, presence and fit of the glaze, internal structure of the mineral species (if the ware is not vitreous), their particles sizes and shapes, presence and type of aggregate (or grog), brittleness of the matrix, and more.

Pages that reference this post in the Digitalfire Reference Database:

Thermal shock


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.