It has also a damper made of nonmetallic material (31) for increasing the damp.

A sound-insulating member combining high vibration-damping performance with high sound-insulating performance; a vibration-damping material constituting the member; and a resin composition for obtaining the material.

The invention relates to an air shock absorber, especially for a unit support in motor vehicles, that is mainly characterized by its high damping performance, its compact dimensions and easy regulation and control.

The novel viscoelastic composition has rheological properties consistent with a good dispersive viscoelastic and improved damping ability over commercial dispersive viscoelastics.