The results of dynamic tests on building brick samples were analyzed using the incubation time fracture criterion. The strength and time properties of sand-lime brick and ceramic brick were under study. The tests were carried out using the classical Kolsky method and its modification - dynamic splitting. Strain rates under compression reached 2.5·103 MPa/s while stress rates under tension reached 3.5·102 GPa/s. It is noted that the strain rate affects the strength and time properties of the materials under study. The parameters of the incubation time fracture criterion were determined on the basis of the experimental deformation diagrams of material in axes stress versus time. Herewith, nonlinear nature of the loading branch of dynamic diagrams was taken into account. Both tested materials qualitatively showed the same change of the mechanical properties.