Sorbothane
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Sorbothane is a synthetic viscoelastic urethane polymer. It has wide industrial applications from acoustic shielding to cushioning in shoe soles. The material combines some of the properties of rubber, silicone, and other elastic polymers. It is considered to be a good vibration damping material, an acoustic insulator, and highly durable. An unusually high amount of the energy from a falling object dropped onto Sorbothane is absorbed.