Alpha–Beta Alumina

The alpha phase brings density and abrasion resistance, the beta phase brings resistance to alkali vapour; the composition holding both gives a balanced answer for glass furnace superstructure. It is preferred where the material does not touch the glass directly but alkali vapour condenses — port necks, upper walls and arch springers.

Alpha–beta alumina and jargal blocks are fused cast from high-purity alumina. Because they contain no zirconia, they do not seed the melt with zircon and carry a very low risk of stones and blisters in the finished glass. They are the preferred lining for superstructure, forehearth channels and feeder zones, particularly in container and flat glass production.