- Chemical Family:Bauxites
- Functions:Filler
- End Uses:Welding Products, Ceramics
Portalum® A 90 is produced from refractory agglomerated super calcined (RASC) bauxite. The main constituent is the mineral corundum. It enhances abrasion and chemical resistance in coatings, while its high hardness and density are valued in abrasive/friction applications such as brake pads. Sibelco Portalum calcined bauxite (aluminum oxide) is produced from  refractory agglomerated super calcined (RASC) bauxite.