Sound protection panel for cladding a wall of an automotive vehicle

A sound protection panel for cladding a wall of an automotive vehicle, the sound protection panel comprising a spring mass system:

• a lower spring layer made from resiliently compressible material, the lower spring layer being configured to be positioned towards the wall,
• an upper mass layer made from flakes of resiliently compressible foam, the flakes being bonded together by a bonding agent and the upper mass layer being configured to be positioned away from the wall on top of the lower spring layer,
• wherein the bonding agent is made from bi-component fibres comprising a core, the core being fusible at a temperature or non-fusible, and a sheath fusible at a temperature which, if the core is fusible, is lower than the temperature of fusion of the core, the flakes being bonded by the fusion of the sheath to form an agglomerated upper layer,
• the percentage by mass of the bicomponent fibres in the upper mass layer being between 15% and 30% of the mass of the upper mass layer;
• and
• the upper layer having a Young's modulus greater than 1 MPa, measured in a direction corresponding to the thickness of the upper layer, and having a mass per unit area of between 0.7 and 5 kg/m2.