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Disodium Octaborate Tetrahydrate

Alternate Names: Na2B8O13.4H2O, Polybor

Oxide Analysis Formula
Na2O 15.02% 1.00
B2O3 67.50% 4.00
H2O17.48%
Oxide Weight 340.63
Formula Weight 412.78

Notes

CAS Number 12280-03-4

This is a mild alkaline salt consisting of a fine white powder that is readily soluble in water. It dissolves even in cool water to give supersaturated solutions with high boron concentrations. This material is not generally used in ceramics.

It shows little tendency to cake except after prolonged storage or if it becomes severely wetted by rain or substantial water penetration. It is also capable of absorbing moisture if exposed to a humid environment.

Related Information

Links

URLs http://www.borax.com/pdfs/dist/Profile_Polybor.pdf
Polybor Data Sheet
Materials Boric Acid
Materials Anhydrous Borax
Materials Borax Decahydrate
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.
Minerals Borate Minerals

By Tony Hansen


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