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Al2O3 in glazes make them durable and wear resistant

The cone 6 glazes on the left have double the boron of those on the right so they should be melting much more. But they flow less because they have much higher Al2O3 and SiO2 contents. This effect renders them milky white vs. the transparent of those on the right. Why? Because G and H are trapping micro-bubbles because of the increased viscosity of the melt. In spite of this, the two on the left do fire almost transparent when applied to ware, they have enough fluidity to shed most of the bubbles when in a thin layer. The ones on the right are too fluid, they will run excessively on ware unless applied thinly. The sweet-spot is a little more fluidity than those on the left. But there is another very important factor: Durability. The increased Al2O3 in G and H make them fire harder, more resistant to abrasion. The added SiO2 adds resistance to leaching.

Al2O3 in glazes make them durable and wear resistant

Links

Glossary Opacity
Opacity of ceramics glazes is normally achieved by adding an opacifier like tin oxide or zircon. However there are chemical profiles that can turn transparent glazes milky and make it cheaper to opacify them.
Oxides B2O3 - Boric Oxide
Oxides Al2O3 - Aluminum Oxide, Alumina

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