Castable, Relatively Stiff Acoustic-Damping Materials

A recently invented family of acoustic-damping materials offers advantages over prior acoustic-damping materials:

• Relative to soft rubbers and the like previously used for acoustic damping, these materials have high moduli of elasticity; that is, these materials are stiffer and, therefore, better suited for applications in which some stiffness is required.
• One prior acoustic-dumping material contains lead and is produced by casting into blocks that must then be machined to desired sizes and shapes. The release of lead particles during machining poses a toxicity hazard. In contrast, the present materials have little toxicity and can be cast in molds to final sizes and shapes, without machining.