Gillespie Borate is a blended borate mineral for use in glaze formulas replacing Gerstley Borate on a pound-for-pound basis.
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.
Raku, Earthenware, Stoneware and Porcelain - Excellent over a wide temperature range from below cone 06 to cone 10
Special Effects - Excellent glaze texture and activity for specialty glazes.
Coloured Glazes - GB works well with most pigments and has an exceptionally wide colour palette.
Recommendations for using Gillespie borate:
- Do not use excess water in mixing the glaze.
- Store the wet glaze in an airtight container.
- When using any substitute material always test it in a small batch of glaze.
- Test the glaze on the same clay body you will use in production.
- After applying the glaze to several vertical test tiles place them throughout the kiln.