Inert alumina ball used in gas ,oil ,fertilizer and chemical et. as a catalyst support covering materials of reactor Inert alumina ball used in gas ,oil ,fertilizer and chemical et. as a catalyst support covering materials of reactor.Advantage :(1)high stength (2)high chemical stability (3)Thermal stabilityPercentage of AL2O3 : 90%-99%Size : 25-50mm 99% Alumina ball