Standard Test Method for
Impedance and Absorption of Acoustical Materials by
Impedance Tube Method1

This standard is issued under the fixed designation C 384; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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Click here to download Astm C 375 – 58 (Reapproved 1999)Pdf Free Download