ASTM C 423 - 02 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method

American Society for Testing and Materials (ASTM). Current edition approved April 10, 2002. Published June 2002. 11 p. This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.