Acoustical composite layer (12), provides a method of forming the multilayer insulating material (10) formed from the first insulating layer (14). Sound absorbing and insulating layer includes a thermoplastic material of the polymer system, formed from the reinforcing fibers. Preferably, the reinforcing fibers are wet use chopped strand glass fibers (WUCS). Acoustical composite layer is to spread the WUCS fibers, mixing the reinforcing fibers and polymer fibers, and molded and reinforced fibers and polymeric fibers into a sheet, followed by bonding the sheet can be formed. Then, a first insulating layer formed of one or more polymeric type thermoplastic organic material is disposed on the first major surface on the backing composite layer. The second insulating layer made of polymeric fibers (16) selectively, is disposed on the second major surface of the backing composite layer. Multi-layer sound-absorbing material, can be used in semi-structured and soundproofing applications.
.TECHNICAL