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Gerstley Bor (99)

Description: Plastic Calcium Borate, Borocalcite

Oxide Analysis Formula
CaO 19.35% 0.88
Na2O 2.97% 0.12
Al2O3 7.17% 0.18
B2O3 26.31% 0.96
SiO2 21.70% 0.92
LOI 22.50%n/a
Oxide Weight 197.29
Formula Weight 254.57

Notes

Since this material varied so much over the years, Ron Roy has been using various dated versions of the analysis, this is one of them.

Related Information

Links

Typecodes Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
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