The technological and physical and mechanical properties of extrusion raw material for the production of polyethylene pipes of different manufacturers are research. It is determined that the dependence of composition-property is being defiined not only by the characteristics of the initial polymer raw material but also by the conditions of the mixture processing. The possibility of improving the machinability of extruded polyethylene of low fluidity by mixing it with a higher fluidity polyethylene brand has been proved. The optimum composition content on the basis of polyethylene mixtures, having sufficient manufacturability for processing of raw materials by extrusion has been grounded. Кеу words: extrusion, water pressure pipes, polyethylene, mixture, index of melt flow, tensile strength, flow curves.