Non-cryogenic pulverization of rubber material was obtained under high compression and shear using a modified Bridgman Anvil apparatus. The effects of operating variables, such as temperature, normal and shear forces, shear rate, and residence time were examined, and optimum conditions for obtaining desired particle size distribution with minimum agglomeration were identified. Based on our strain energy storage theory, a criterion of pulverization was obtained and computational analysis of deformation of rubber using a Mooney-type equation for stored energy was performed. The numerical values for strain energy distribution in a rubber disk, which indicate potential pulverization under different compression and shear forces, were obtained using the ANSYS computer program. This information was used as a guide to obtain optimum operating conditions and design parameters for optimum design of the solid state shear extrusion (SSSE) pulverization process [H. Arastoopour, Single Screw Extruder for Solid State Shear Extrusion Pulverization, U.S. Patent No. 8,101,468 (1998)].