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This study aimed to identify changes in the physical properties of artificial mineral-fiber materials used as building insulation that had been installed in the outer walls of buildings for a long time. To achieve this goal, glass fiber and rock wool were collected from outer walls in actual buildings and their acoustic and thermal performances were measured. These were compared with measure-ments from similar products manufactured recently. The results showed that old, used samples had a lower sound absorption coefficient compared to recently manufactured materials. The old samples also displayed increased compressibility compared to new materials. For example, the compressibility dif-ference for glass wool was 7.32 mm. Old samples had a dynamic stiffness 1.28 MN/m 3 higher than new material samples. The thermal conductivity of both old and new samples increased within creas-ing temperature. They showed similar results at temperatures between 0 and 20℃. * 1.                   .

Changes in Physical Properties of Fibrous Sound Absorption Materials According to the Manufacturing Time