Polymer blend is the physical mixture of two or more polymers without any intentional chemical reaction between the components. The basic goal is to combine the best properties of each blend component that, consequently, will have intermediary properties to those of the polymers used. The biggest advantages of the blends are the great variety and the versatility on their applications that added to the good processability, make possible the production of many products making them competitive in relation to other materials. Another objective of the blends is to optimize the cost/benefit relation and improve the processability of high temperature polymers. The materials used on this work were the HDPE and the PA12, both polymers being of great industrial importance. The interest of this work is to produce HDPE/PA12 blends and evaluate their miscibility and make tests to know their properties. The blends were made in three compositions: 75/25, 50/50 and 25/75 and it was done the mechanical characterization with uniaxial tension and creep behavior, chemical characterization with FTIR analysis and x-ray diffraction, rheology and SEM analysis and the results were used to evaluate the combination of the properties of the neat polymers used in these blends.