Blends are polymeric materials originating mixture of at least two polymers and/or copolymers. However, blending two immiscible polymers is a problem, since the mixing materials are hardly processed,extruded or injected, and can be very brittle. One of the most used agents to improve the interaction between two immiscible polymers is the addition of a third component to the mixture, called a compatibilizer agent which enhances adhesion between the polymers and improves mechanical properties of the resulting material. The polystyrene (PS) is a commercial polymer commonly used by the industry of plastic transformation, due to its transparency, ease of processing, thermal stability, low density, high modulus, excellent electrical properties and low cost. However, its mechanical properties such as ductility and toughness limited. For this reason, the main technique used by industries polymer has been reinforced by elastomer. Blends of polystyrene/compound by recycled rubber (SBRr), with the addition of the compatibilizer (SBS) were prepared using a twin screw extruder and the mechanical and thermomechanical properties evaluated. On impact testing it was observed that the result of the blend of PS/SBRr (50/50%) than blends 70/30 and 60/40% is better, this may have been due to the higher content of elastomer. The increase in elastomer content of the mixture and the addition of compatibilizer SBS improved impact strength. The results showed that the HDT and without compatibilizer compatibilized blends decreased with the increase of the amount of SBR added, but reduced somewhat compared to the PS, this may be due to the presence of the PS matrix, which is characterized as a hard material, and possibly requiring a higher temperature for the sample to suffer deflection. The results indicate a good prospect of application of these industrial wastes, minimizing the negative effect on the environment and adding value to a waste material. Keywords: polystyrene, SBR, SBS, blends.