Hard calcined alumina

Hard calcined alumina

These aluminas have low specific surface area (BET < 1m²/g) and are almost entirely alpha alumina. Standard soda content is 3000-4000 ppm and intermediate soda content is 2000-3000 ppm.  Hard calcined aluminas are produced in rotary kilns. 




Glass is an amorphous material that benefits from the presence of alumina to enhance strength, and thermal and chemical resistance. It also improves the process of glassmaking with respect to melt viscosity, vitrification and working temperature.  There are many familiar applications using glass including:
  • Display and coverglass for LCD and OLED screens for TV, monitors, laptops, tablets, smartphones, etc...
  • Photovoltaic glass for solar panels  
  • Flat or float glass for the construction and automotive industries 
  • Tableware and cookware 
  • Bottles and jars 
  • Bottles for perfumes 
  • Pharmaceutical and laboratoryware 
  • Glass ceramics for cooking surfaces
  • Glass fibres


Bricks and shaped materials

Refractories are construction materials designed to withstand aggressive service conditions at high temperature. Refractory materials are used as heat-resistant walls, coatings or linings to protect units from oxidation, corrosion, erosion and heat damage. Industries that need refractories include: steel, non-ferrous metals, glass, power, cement, petrochemicals and waste incineration. Refractory products can be divided into the following types: Bricks and shaped materials, monolithic materials and insulating materials.


Bricks and shaped materials – prefabricated shapes including bricks for linings, kiln furniture and functional products such as slide gates for steel flow control.




Alumina products as commodity raw materials. Major uses are sintered and fused transformation products and refractory commodities, specifically:
  • Tabular alumina and spinel
  • Fused alumina
  • Ceramic fibres
  • Fused cast refractories
  • Calcium aluminate cements



The Aluminium ion takes the place of the Si ion in the crystalline network. This enables the make up of the glaze to be varied without modifying the mechanical properties.