ASTM WK67646

    Revision of E1050 - 12 Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System

    (What is a Work Item?)

    Active Standard: E1050 - 19

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



    absorption; frequency response function; impedance; impedance ratio; impedance tube; normal incidence sound absorption coefficient; specific normal acoustic impedance; transfer function; ICS Number Code 091.120.20


    This change is to incorporate the precision and bias statement determined by a recent inter-laboratory study utilizing differing material types replacing the previous statement determined using a single material. The inter-laboratory study also included the acoustic resistance, reactance, conductance, and Susceptance. Not only does the statement now encompass an overall statement, but an appendix showing the individual material type precision is also added. The research report number will be generated and added once the ballot is approved.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Kevin Herreman


    E33 (19-03)

    Ballot Item Approved as E1050-2019 and Pending Publication