Industrial Coatings / General Industrial, Marine and Protective Coatings / Calcined Bauxite

Calcined Bauxite

Calcined bauxite (aluminium oxide) is produced from Refractory Agglomerated Super Calcined (RASC) bauxite. The main constituent is the mineral corundum. Calcined bauxite can be characterised by:


  • High Mohs hardness of 8.5
  • High inertness in various media.


Basic properties

Property Value Unit
Moisture 0.1 [%]
Hardness (Mohs) 8.5 [-]
Colour dark grey [-]
Density 3.8 [kg/ dm3]



Product overview

Product Grade D50





[g/ 100 g]

Portalum A25 10 41 13

Production location Portalum



Calcined bauxite will provide:


  • Excellent abrasion resistance: due to its hardness of 8.5 on Mohs scale, calcined bauxite will increase the coating’s resistance to wear.
  • Chemical resistance: due to its inert nature, calcined bauxite will provide good chemical resistance compared to conventional fillers.


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