Thermoplastics are the most used polymers nowadays on account of being easily reprocessable with high temperatures. During the oil crisis in 1973 the costs of transforming oil into plastic materials became more attractive than turning them into more traditional materials. Furthermore, the investments in transformation industries grew alongside the concern for the environment. Due to the ease of reprocessing these materials a lot of companies started recycling them within their process. In this context, the present study aims to analyze the mechanical behavior of a low density polyethylene (LDPE) and high density polyethylene (HDPE) blend and pure LDPE after 10 cycles of reprocessing. The polymers were donated by Companhia de Canetas Compactor. The materials suffered up to 10 cycles of injection moulding/extrusion. Tensile tests were made to determine the maximum yield stress and maximum load allowed. Afterwards, calculations were made to determine elongation, Young modulus and toughness. The HDPE addition was responsible to raise the materials yield stress and hardness. From a practical point of view the reprocessing didn t affect significantly the materials performance. FTIR analyses didn t detect oxidation through the process.