ASTM C423-99a
Historical Standard: ASTM C423-99a Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
SUPERSEDED (see Active link, below)
ASTM C423
1. Scope
1.1 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.
1.2 Field Measurements Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.
1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3).
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
C634 Terminology Relating to Building and Environmental Acoustics
E795 Practices for Mounting Test Specimens During Sound Absorption Tests
Keywords
acoustical; acoustics; decay rate; noise; noise reduction coefficient; reverberation room; Acoustical tests; Decay rates; Noise reduction coefficient; Reverberation room method; Sound absorbing/insulating materials/applications;
ICS Code
ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)
DOI: 10.1520/C0423-99A
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