Abstract: An acoustic insulation web of fibrous material includes: a nonwoven batting including: a first layer including a first plurality of low-melt binder fibers forming a first predetermined percentage of the first layer; and a second layer bonded with the first layer and including a second plurality of low-melt binder fibers forming a second predetermined percentage of the second layer, the first predetermined percentage being greater than the second predetermined percentage such that the first layer is denser than the second layer.

Abstract: An acoustic insulation web of fibrous material includes: a nonwoven batting including: a first layer including a first plurality of low-melt binder fibers forming a first predetermined percentage of the first layer; and a second layer bonded with the first layer and including a second plurality of low-melt binder fibers forming a second predetermined percentage of the second layer, the first predetermined percentage being greater than the second predetermined percentage such that the first layer is denser than the second layer.

Abstract: A composite insulation material comprises a layer of refractory fabric having a layer of a metallic material bonded thereto. The refractory fabric may be comprised of pyrolyzed polymer or an inorganic material such as a mineral fiber, glass, ceramics and the like. Also disclosed is a thermally and acoustically insulated vessel fabricated from a body of polymeric material which defines at least a portion of the vessel, and which has a body of refractory fabric partially embedded in and retained by the polymeric material so that the refractory fabric is exposed upon a surface of the body of polymeric material. Disclosed are air ducts, fuel tanks and conduits of this type.