Glaze Course - Lesson Summaries
Frits - the role of B2O3
Lesson Number 20
Low Temperature Glazes

In the course of your studies to date you have researched the role of individual oxides in glaze melts. Most of these oxides have been easily classified in terms of their role in the glaze melt fitting conveniently into the definition of Flux, Stabiliser or Glass Former.

In this lesson we are going to look at Boric Oxide (B2O3). This is an oxide which does not fit easily into these categories even though it's molecular structure suggests that it should perform as a stabilizer. For this reason it can be considered a kind of "Joker in the Pack" - a wild card that can be used beneficially in a number of circumstances sometimes taking on the role of flux as well as glass-former.

After examining the properties of boric oxide we will look at it's use particularly in low temperature glazes.

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Contact: Lawrence Ewing - 1015 Ellis Rd, Five Rivers, RD3, Lumsden, Northern Southland,
New Zealand