Polymer nanocomposites are a class of reinforced polymers with a small amount of clay nanometer particles, due to which they have improved barrier characteristics, fire resistance and strength. These properties allow these materials to be successfully used for the manufacture of panels, protective and decorative coatings in the automotive industry, civil engineering and electrical engineering, as well as for the manufacture of packaging. The book provides a comprehensive overview of the main types of polymer nanocomposites and their properties.