Acoustic Properties of Recycled Rubber at Normal Incidence

Abstract

This paper presents the results of testing acoustic properties of samples formed of recycled rubber granules and a binding agent made of polyurethane resins. The testing was performed in an impedance tube with the diameter of 100mm by using the transfer function method between two microphones defined by the standard SRPS EN ISO 10534-2. The samples with the thickness between 10mm and 50mm were tested. The results show that recycled rubber has excellent absorption properties and that the increase in thickness of the material leads to the increase in the values of the sound absorption coefficient at lower frequencies.