PREMIUM NEXT DAY DELIVERY AVAILABLE ON MOST ORDERS PLACED BEFORE 12PM
PLEASE NOTE: FOR LARGER RAW‑MATERIAL ORDERS COLLECTED IN‑STORE, THERE MAY BE A WAIT WHILE WE PREPARE YOUR ITEMS. THANK YOU FOR YOUR PATIENCE!
Gerstley Borate 1kg
£11.35 GBP
Gerstley Borate 1kg
G.B. is an inexpensive source of B2O3 and CaO in glazes. It is often used in place of colemanite. The primary differences are:
Colemanite contains a higher concentration of B2O3,
G.B. contains Na2O, which may affect the color and surface of some glazes, and
the Bentonite component of G.B. - up to 18% - significantly affects the properties of the raw glaze. (Some other sources indicate that this is not bentonite, but rather shale. GB glazes do tend to gel in either case.)
