e coarse-grained fraction can also contain other oxides in addition to the crushed granulate and/or the hollow-sphere structures, e.g. Al.sub.2O.sub.3, ZrO.sub.2, TiO.sub.2.The coarse-grained fraction present in the material composition according to the invention in particular allows large-volume solid or hollow components based on a thermal shock and corrosion resistant aluminum material to be pr