An extremely runny glaze at cone 6. The runniness is manageable, it has other issues!

Sunday 4th December 2016

This recipe melts to such a fluid glass because of its high sodium and lithium content coupled with low insight-live.com/material/1245">silica levels. Reactive glazes like this produce interesting visuals but these come at the obvious cost of being runny like this. But this problem can be managed with glaze technique, a catch glaze on the outside and a liner glaze (to prevent the formation of a lake on the inside bottom (which leads to glaze compression problems). A bigger problem is that recipes like this often calculate to an extremely high thermal expansion. That means food surfaces will craze badly. Another issue that underscores the value of using a liner glaze: Low silica often contributes to leaching of the lithium and any heavy metals present in colorants.

Pages that reference this post in the Digitalfire Reference Library:

Glaze Compression, Melt Fluidity, Leaching, Fluid Melt Glazes, Runny Ceramic Glazes

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.