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Polymer nanocomposite foams are unique materials that can be chemically, mechanically and structurally controlled in order to maximise the desired property of the material.Through size,shape and surface modification, as well as method of absorption of the nanofiller into the composite material, the functionality of the foam can be enhanced or altered [1].This work looks at the incorporation of sepiolite clay nanorods into a polyurethane (PU) foam matrix in order to improve the sound vibration absorption properties of open cell flexible foams.