Gerstley Borate
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Gerstley Borate use in glazes as a secondary flux at mid range and often as primary one at low fire and raku More details... |
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Product Details
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Gerstley Borate (GB) was mined near Boron, CA and ground by Hammill & Gillespie and Luguna Clay Co. (in fact it was named after a former president of The Borax Company*). In addition to its use in glazes as a secondary flux at mid range and often as primary one at low fire and raku (this material was also employed in ceramic bodies, as a bonding agent in grinding wheels, and a little was even used as a fire retardant). GB was popular in middle temperature glazes because its high melt fluidity produced 'hare's fur', textured and variegated visual effects that were remnants of the interactions between the more and less viscous phases of the melt. In low fire glazes GB was an excellent base that made for slurries with good application and melt properties.
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