LABORATORY CHARACTERIZATION OF A MULTILAYER ACOUSTIC MATERIAL

Innovative materials to accomplish thermal and sound insulation are constantly emerging from the industry. In this paper one of those innovative materials, mainly destinated to applications in environments such as yachts and ships, is characterized by means of a three-microphones impedance tube. In this way, acoustical and non-acoustical properties were either measured or extracted by means of indirect characterization. Several samples were tested and their properties were found comparable to commonly used foams and porous materials, showing the applicability of this composite material to sound insulation problems in particular environments such as the ones of transportation systems, where non-combustibility, effectiveness and low weight are essential charachteristics.