During the 1990s, the chief usage of NVH material was mainly as a cavity filling material. However, these were heavy and not flexible enough to make up for the spaces inside the auto doors or also under the headliners where the engine and road noise could be filtered inside the cabin. Moreover, NVH material also absorbed water from enclosed spaces. However, the early function of NVH material helped in curbing the noise inside the vehicle and this feature of the material became strategic in selling the new vehicles.
An elevated feature of NVH material came with the advent of a non-woven blown microfiber (BMF). The new material was created by 3M and is a series of mat insulation which also featured an internal web composed of polyester (PE) and polypropylene (PP) fibers. It is due to the exceedingly fine material of PP fibers, high-energy absorption was possible without adding weight. Moreover, the PE fibers also contributed in adding strength, stability and loft.
Furthermore, it came with an added feature of compressibility to the installation process, which expanded to fill cavities. Additionally, the hydrophobic properties of the material also helped in eliminating water absorption which was a major concern with NVH material.
Presently, NVH products are also developed on the basis of software generated models which need advanced facilities, Moreover, products which require NVH material like instrument panels, display protection, haptics and gasketing will require special attention. As a result, slim NVH materials are expected in the future.