Product Description

Gillespie Borate also know as Gerstleys Borate, Gillespie Borate is a blended borate mineral for use in glaze formulas replacing Gerstley Borate.

Consistency - Manufactured from high purity refined raw materials, Gillespie Borate™ is highly consistent from batch to batch.
Oxide Match - Virtually identical to Gerstley Borate, this product requires no adjustment to formula and no extra additives are needed.
Mineral Match - Gillespie Borate™ provides the same minerals to the glaze as Gerstley Borate, thus imparting the same glaze activity, texture and effects.
Particle Size Match - As a -200 mesh material, Gillespie Borate™ combines well with other glaze raw materials.
Plasticity Match - A high colloid and clay content gives the plasticity necessary for many applications.
Reduced Glaze Defects - Our laboratory studies indicate that Gillespie Borate™ gives increased glaze surface smoothness and a reduction in crawling and pinhole defects.
Lower In Off-Color Impurities - As a refined blended material, Gillespie Borate™ contains few impurities and produces brighter glazes and colors.

By MikeBraisher on 27th June 2023

"Seems an excellent substitute for calcium borate frit, in fact gives the same colour response but much better surface in the recipe I use."