Cone 10 mug is crazing after a year. That's OK because it's high-fire, right?

Tuesday 25th February 2014

Wrong. This insight-live.com/glossary/125">cone 10R grey stoneware, H550, is OK if the glaze fits. But this high feldspar glaze on the inside has begun to craze after a year. The greyer coloration around the craze lines indicates that water is soaking into the slightly porous body. And, this mug has lost the ring it had out of the kiln. Imagine your customers returning these pieces! Could they be refired to be as good as new? Perhaps. But they would return to this condition. The practical solution is to reformulate this glaze to reduce its thermal expansion.

Pages that reference this post in the Digitalfire Reference Library:

ChatGPT is completely wrong about the cause of glaze crazing!, Co-efficient of Thermal Expansion, Desktop Insight 3 - Dealing With Crazing, 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.