| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorbing material which is good in sound absorbing properties and ventilation performance, and excellent in immersion-proof performance, and to provide a sound absorbing panel. SOLUTION: The sound absorbing material 1 is formed of a plate member 2 having a plurality of through holes 3 with a diameter of 30μm or less perforated therein in a plate thickness direction. Alternatively the sound absorbing material is formed of a plate member having a plurality of through holes with a diameter of 30μm or more and 400μm or less perforated therein in a plate thickness direction, and makes one surface thereof water repellent. COPYRIGHT: (C)2008,JPO&INPIT
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