ASTM WK40740

    Revision of C423 - 09a Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method

    (What is a Work Item?)

    Active Standard: C423 - 09a

    Developed by Subcommittee: E33.01 | Committee E33 | Contact Staff Manager


    1. Rationale

    The work item will cover two tasks that are being researched. One is the effect of moving air on the reverberation time measurements and the other is the effect of sample size in relationship to reverberation chamber volume. Ron Sauro will prepare a detailed test protocol for each task and a detailed description of the data to be reported. The protocols will be shared with the laboratories to obtain agreement on the procedures. Depending on the procedures, some laboratories may not be able to participate. Since this is still research, participation by the laboratories will be strictly voluntary but I dont think that will be a problem. After the protocols are agreed upon, arrangements will be made to ship similar (nominally identical) materials to each participating laboratory for testing. The laboratories will be apprised of the total cost for the materials and shipping before they agree to participate. The data should be collected by a non-laboratory entity (to be determined) to make the data anonymous and then distributed to all of the participating laboratories. Ron Sauro will be primarily responsible for analyzing the data and presenting the results to the task group as it relates to the two tasks defined above. If the data indicates modifications to C423 are appropriate, the chairman of the C423 task group will get involved to guide the balloting of the modifications.


    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;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Ron Sauro

    Draft Under Development