Is made by firing a source alumina at various temperatures, depending upon desired level
of calcination ( burn), into alpha alumina varying from 5-100 % moving it to its densest
and most stable form.The calcined alumina particles appear as crystalline agglomerates
which are larger when the degree of calcination is higher.
Calcined alumina is generally used in the manufacture of refractories,glass,ceramics and
enamel etc