Sound insulation panel with integrated mounting

The soundproofing panel, incorporating a layer of a thermoplastic material and designed to be fitted between first (4) and second (5) rigid components, has at least one fixing boss (6) which is incorporated in the thermoplastic layer. The fixing boss has a connector (7) for linking with a matching element (8) on the first component, and an anchor (9) to engage with a matching anchor (10) for the second component (5).