Gerstley Borate

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Gerstley Borate – Na2O2CaO5B2O316H2O (m.p. 1225o F/660o C) is a sodium Calcium Borate compound. Its water solubility is minimal and, therefore, it is one of the only quasi-insoluble sources of Boron other than frit. It is widely used as a low-temperature flux and has the advantage of producing low temperature leadless glazes that tend to craze less than other Alkaline varieties. It also tends to advance a milky blue opalescence to a glaze that contains it as flux.

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1 lb, 5 lb, 25 lb, 50 lb

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