Bonded alumina-zirconia-silica (AZS) with 10% zirconia


ZA33 is adapted for most of the standard feeder expendable applications.

Typical application

  • spouts
  • skimmer blocks
  • back blocks
  • mantle blocks

ZA33 is suitable for sodalime, container and, cosmetic glassware.


Chemical and physical properties

Typical chemical composition


Typical crystallographic analysis

Main phase:

  • corundum
  • monoclinic zirconia

Secondary phase: 

  • mullite
  • silicate

Physical characteristics

Description International standards British standards
Cold crushing strength 140MPa 20,305psi
Refractoriness under load 2 105Pa,
0.5% at
1,640°C 2,984°F
Coefficient of thermal expansion 7 10-6K-1 3.8 10-6°F-1
Thermal conductivity at 1,000°C 2.4 W.m-1.K-1 16.65 BTU in hr-1ft-2°F-1
Thermal shock resistance good good
Porosity 15% 15%
Typical bulk density 3.05g/cm3 190pcf


The bonded alumina-zirconia-silica (AZS) with 10% zirconia, ZA33 solution must be stored in a dry environment protected from weather conditions.

Expendables Catalog

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