Do you know the purpose of these common Ferro frits?

Tuesday 29th July 2014

I used a binder to form 10 gram GBMF test balls and fired them at cone 08 (1700F). Frits melt really well, they do not gas and they have chemistries we cannot get from raw materials (similar ones to these are sold by other manufacturers). These contain boron (B2O3), it is magic, a low expansion super-melter. Frit 3124 (glossy) and 3195 (silky matte) are balanced-chemistry bases (just add 10-15% kaolin for a cone 04 glaze, or more silica+kaolin to go higher). Consider Frit 3110 a man-made low-Al2O3 super feldspar. Its high-sodium makes it high thermal expansion. It works in bodies and is great to incorporate into glazes that shiver. The high-MgO Frit 3249 (for the abrasives industry) has a very-low expansion, it is great for fixing crazing glazes. Frit 3134 is similar to 3124 but without Al2O3. Use it where the glaze does not need more Al2O3 (e.g. it already has enough clay). It is no accident that these are used by potters in North America, they complement each other well. The Gerstley Borate is a natural source of boron (with issues frits do not have).

Pages that reference this post in the Digitalfire Reference Library:

Ferro Frit 3110, Ferro Frit 3195, Ferro Frit 3249, Ferro Frit 3124, Ferro Frit 3134, Gerstley Borate, B2O3, G1916Q - Low Fire Frit 3195 Glossy Transparent, Where Do I Start?, GBMF Glaze Melt Fluidity - Ball Test, Five common frits fired at cone 03 (1950F), What has this low fire transparent glaze turned blue?, Base Glaze, Glaze Chemistry, Frit, Boron Frit, Calculated Thermal Expansion, Shivering, 1400F-Common frits begin melting, 1600F-Gerstley Borate Melts Suddenly, Glaze Shivering

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