Alumina mortar for sealing and jointing


High alumina heat-setting cement to joint and seal Alumina and alumina-zirconia-silica (AZS) refractories.

Typical application

Multi-purpose high alumina mortar for jointing / sealling fused cast alumina and alumina-zirconia-silica (AZS) refractories for both glass contact and superstructure applications.

A-621 has a good resistance to glass corrosion and excellent glass contact properties.

Chemical and physical properties

Typical chemical composition


Typical crystallographic analysis

  • Corundum

Physical characteristics

Description International standards British standards
Maximum diameter 0.25mm 60Mesh
Typical bulk density 2.62g/cm3 164pcf

Instructions of use

Typical drinkable water addition: 13-16% by weight

Packaging and storage

  • 45.5kg/bag (100lbs/bag)
  • Must be properly stored up to expiry date in undamaged original sealed packaging, in dry conditions at temperatures between +5°C and +40°C

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