... the packing in the columns in such varied areas, for example, petroleum, chemical industry, chemical fertilizer, natural ... environmental protection etc.There are lots of merits for it, for instance, the stronger resistance to high temperature ... Chemical compositionsContentAl2O3(Standard value +4) %Al2O3+SiO2≥92%Fe2O3<1%Physical and chemical properties Main crystal phasesAl2O3PropertyFeldstarFeldstar ...