Calcined Alumina used as raw materials for aluminous refractory, ceramic product, ... , impurity content, no more than:Fe2O3 - 0,03%; SiO2 - 0,02%; Na2O- 0,4%The phase composition of the material:α- Al2O3 ... -5 micronno more than 1%-45 micronno more than 20%Calcined AluminaITEMAL2O3 %Na2O%SiO2%Fe2O3%a-AL2O3%MESHSNA8099.60.270.020 ...