Disodium Octaborate Tetrahydrate

Alternate Names: Na₂B8O13.4H₂O, Polybor

Oxide	Analysis	Formula
Na2O	15.02%	1.00
B2O3	67.50%	4.00
H2O	17.48%	n/a
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 A white, odorless product crystalline granular by dehydrating Borax to remove the crystal bound water.
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 The major borate minerals are Colemanite and Ulexite. The geology required for borates is found in v

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