Cone 6 transparent way better without Gerstley Borate. I surgically removed it to create G2926B!

Wednesday 19th February 2014

These are the original cone 6 Perkins Studio Clear (left) beside our insight-live.com/glossary/43">fritted version (right). You cannot just substitute a frit for Gerstley Borate (GB), they have very different chemistries. But, using the calculation tools in my account at insight-live.com, I compensated for the differences by juggling other materials in the recipe. I even upped the Al2O3 and SiO2 a little on the belief they would dissolve in the more active melt the frit would create. I was right - a melt-flow GLFL test comparison (inset left) shows that the GB version flows less. Using this on ware exhibited another issue (after doing a IWCT test): Crazing. The very good melt flow on my G2926A fritted version is thus good news: It can accept more silica - the more silica, the more durable and craze resistant it will be. How much did it take? 10% more! That ultimately became the recipe for our standard G2926B cone 6 transparent.

Pages that reference this post in the Digitalfire Reference Library:

A Low Cost Tester of Glaze Melt Fluidity, Trafficking in Glaze Recipes, Click here for case-studies of Insight-Live fixing problems, Frit made this Gerstley Borate glaze much better , Glaze Chemistry, We Developed the G2926B Transparent Glaze by Doing Four Unique Things

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.