Solid State Shear Extrusion (SSSE) is a process for the pulverization of polymers and rubbers at high shear and compression without using cryogenic fluid for cooling. This process, which is based on the large compressive shear deformation of polymeric or electrometric granulates results in the storage of a large amount of strain energy. When the stored energy reaches a critical level, the material cannot sustain itself. As a result, the stored elastic energy is converted into surface energy through the formation of new surfaces, and in turn, pulverization occurs. Smaller particles were obtained when the material was sufficiently compressed, and loss of strain energy, due to stress relaxation being minimized by significant and uniform coding in the pulverization zone. In this presentation, effect of process parameters and physical, thermal and chemical characterizations of the produced particles will be discussed. In addition examples of the application of produced rubber particles in the molded rubber products and in the manufacturing of new products such as particulate phase interpenetrating networks with hydrophilic character will be also presented.