... ,No air pockets excellent wear resistance High crushing strength Alumina Silicate Hollow Ball Physical And Chemical Indicators Items Typical Properties Al2O3(%)40 ... (%)≤1.8≤3.5≤4.5≤5.0 Product profile:Alumina Hollow Ball is a new kind of heat insulation material, it ... in industrial aluminum and blowing, crystal - for Al2O3 nanocrystal. In alumina bubble can be made for the subject, the use of ...