Gillespie Borate

Gillespie Borate is a blended borate material designed for use in glazes to replace Gerstley Borate. It has been on the market for over 20 years.

A substitute for mined-out Gerstley borate, a naturally occurring source of boric oxide, promoting early fusion. It is a blend of the same minerals proportioned to preserve the chemistry and working properties of Gerstley Borate. Use it as a 1:1 substitute. Testing first to compare fired results is recommended; some glazes may need minor adjustments.