The composite material developed by Nissan is a type of metamaterial. The characteristics of such materials depend not so much on the properties of their constituent components as on the artificially created structure. They are artificially formed and specially structured media with electromagnetic or acoustic properties that are difficult to achieve by other technological methods and cannot be found in nature.
Nissan has been experimenting with metamaterials since 2008. Then, such composite materials were used only in highly sensitive antennas for studying electromagnetic waves. As a result of these experiments, a new soundproof material was born, which is a combination of a lattice structure and a plastic film. He is able to protect the interior of the car from sound waves with a frequency of 500-1200 hertz. The sound of the motor and the noise of the road fall into this range. At a price, the new acoustic metamaterial is slightly cheaper than conventional rubber sheets and is 75% lighter, but has such characteristics.