Circular economy is new model/strategy based on the assumption that the value of products, materials and resources is to be kept in the economy for as long as possible in order to limit the generation of waste to minimum. Based on this assumption, raw materials can be put into circulation many times by passing from one industry to another or used multiple times in the same industry. The article is proposed to be balanced management of recycling PET bottles, which will not only solve the problem of these products under end of their life cycle, but also provide a direct approach to the establishment of materials management about closed circuit. The article describes the process of processing PET recyclate with modifying additives and then the mechanical properties, i.e. tensile strength, Charpy impact strength of the produced composites, were tested.