Very homogeneous microtextures of porous LiAlO2 have been prepared in a large range of porosity and elementary grain diameter in order to determine more easily the T2 diffusion coefficient in the solid and optimize the best microstructure for the blanket. From this large field of homogeneous microstructures, empirical equations describing the properties of these porous bodies have been deduced, as a function of porosity, grain diameter and temperature, for instance : ultra sound velocity, Young's modulus, ultimate compressive strength, creep, thermal shock and electrical conductivity.