Calcium Borate Frit

About

• Long established as the substitute for colemanite in glazes.
• Damp, coarse frit
• Specific gravity 2.58
• Viscous flow (% at 1050c) 85-115
• Typical Firing Range 800-1100c (not suitable for fast firing)

Typical analysis for Calcium Borate Frit 2268:

• Al2O3 4-6%
• B2O3 48-52%
• CaO+MgO 25-28%
• SiO2 16-19%

Technical notes regarding frits

Most frits, with the exception of lead based ones, can be used in stoneware glazes because the typical % addition would be less than 70%, quite often around 10-20%. Frits when manufactured are smelted at temperatures above 1200C so stoneware firing presents no problem. Our HT Borax frit 2265 is designed for use in primarily stoneware glaze as a major constituent where the higher additions are possible. The frit would typically by part of a recipe also containing feldspars etc. Stoneware glazes would not normally be based entirely on frits. The quoted firing ranges for frits are estimates of the usable range over which the frit could be used as the only component of a glaze, which almost never happens.

See our Technical Information Sheet "Safe Handling of Powdered Ceramic Materials"

Collections

• Frits
• Stoneware Glazes

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