Zinc Borate

Oxide	Analysis	Formula
ZnO	37.40%	1.00
B2O3	48.10%	1.50
H2O	14.50%	n/a
Oxide Weight		186.09
Formula Weight		217.65

Notes

The anhydrous version, 2ZnO 3B₂O₃, can be used as an auxiliary flux in medium-temperature ceramic bodies. Its effectiveness is similar to talc in small percentages (e.g. a 1% addition to a cone 6 stoneware can drop fired porosity by 1%). With talc, the effectiveness drops off rapidly as the percentage increases. With zinc borate, the side effects limit concentrations to below 3% (e.g. it develops glass that amplifies the color of any Fe₂O₃ present, it can affect thermal expansion, it can volatilize).

Zinc borate is mainly used in environmental protection and as flame retardant.

Related Information

Links

Hazards	Zinc Compounds Toxicology
URLs	http://www.e1.greatlakes.com/freb/common/pdf/ZB-467_ds.pdf Zinc Borate Data Sheet Example
URLs	http://en.wikipedia.org/wiki/Zinc_borate Zinc Borate at Wikipedia - Details on it main uses and markets.
URLs	https://www.borax.com/products/firebrake US Borax zinc borate and anhydrous zinc borate
Typecodes	Generic Material Generic materials are those with no brand name. Normally they are theoretical, the chemistry portrays what a specimen would be if it had no contamination. Generic materials are helpful in educational situations where students need to study material theory (later they graduate to dealing with real world materials). They are also helpful where the chemistry of an actual material is not known. Often the accuracy of calculations is sufficient using generic materials.
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.
Materials	Boroflux

By Tony Hansen
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