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

DescriptionInternational standardsBritish standards
Maximum diameter0.25mm60Mesh
Typical bulk density2.62g/cm3164pcf

Instructions of use

Typical drinkable water addition: 13-16% by weight

Packaging and storage

  • ~ 22.7kg/bag (50lbs/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

Related products


Alumina-zirconia-silica (AZS) sealing cement

Alumina-zirconia-silica (AZS) cement to seal and joint alumina-zirconia-silica (AZS) surfaces.


High alumina jointing mortar

Highest alumina content mortar providing remarkable vapours corrosion resistance.