Constraint type vibration damping material

摘要

A constraint type vibration damping material, which exhibits a high vibration damping performance, ease of processing and low cost, is provided, in which a polymer viscoelastic layer (2a) is formed on at least one surface of a rigid body such as a metal plate (1a), and a hard cover layer (3a) is formed on the polymer viscoelastic layer and has a rigidity modulus greater than that of the viscoelastic layer (2a) and smaller than that of the rigid body (1a).