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-Colour Impurities – As a refined blended material, Gillespie Borate™ contains few impurities and produces brighter glazes and colours.