Frit made this Gerstley Borate glaze much better

Thursday 6th February 2014

This is a GBMF test, it compares insight-live.com/glossary/112">the melt fluidity of the Gerstley Borate based cone 6 Perkins Studio clear recipe original (left, our code number G2926) and a reformulated version that sources the boron from Ferro Frit 3134 instead (right, our code number G2926A). The latter is less amber in color (indicating less iron). The good news was that it melted so much better that we were able to add significant Al2O3 and SiO2 to really drop the thermal expansion (improving glaze fit on common clay bodies), which produced our G2926B base recipe. Every time I use it I think of how unfortunate we would have been had we continued to use the Gerstley Borate original.

Pages that reference this post in the Digitalfire Reference Library:

Gillespie Borate, Gerstley Borate, B2O3, G2926B - Cone 6 Whiteware/Porcelain transparent glaze, Trafficking in Glaze Recipes, Original glaze with Gerstley Borate vs. improved version with frit, Gerstley Borate is passing on to a better place. With a 300% price hike., GerstleyBorate.com - The best place for info on Gerstley Borate, Glaze Gelling, Material Substitution, Remove Gerstley Borate and Improve a Popular Cone 6 Clear Glaze

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