Effect of fiber length on the properties of composite materials made of recycled polyurethane foam

The article presents the main ingredients, recipe and technology for obtaining composite materials from secondary polyurethane foam with a filler in the form of polypropylene fibers. Studies of physical, mechanical and operational properties of the obtained composite materials with different filler lengths were carried out. Evaluation of the quality of composite materials and soles showed that the polypropylene filler with a fiber length of 2-4 mm and 4-6 mm meets the requirements of regulatory legal acts and can be used as soles of shoes for everyday wear.