Based on 50 compact and porous corundum materials with sintering additives, the dependence of the material strength on the strength of the interparticle contactsP, the interlayer thicknessh, the particle sized, and the amount of additive is analyzed. A linear dependence ofP ond for porous materials and a quadratic dependence ofP ond 2 for compact materials are established. It is shown that the parameterP is more sensitive to the structural parameters of the material than the material strength.