ASTM E795-23

Standard Practices for Mounting Test Specimens During Sound Absorption Tests

SIGNIFICANCE AND USE
4.1 The sound absorption of a material that covers a flat surface depends not only on the physical properties of the material but also on the way in which the material is mounted over the surface. The mountings specified in these practices are intended to simulate in the laboratory conditions that exist in normal use.  
4.2 Some of the specified mountings require special fixtures or minor deviations from normal practice. These fixtures or deviations are to be used only during laboratory tests and should not be specified for practical installations. They are noted in the specifications for the mountings in question by the phrase “for laboratory testing only.”  
4.3 Test reports may refer to these mountings by type designation instead of providing a detailed description of the mounting used.
SCOPE
1.1 These practices cover test specimen mountings to be used during sound absorption tests performed in accordance with Test Method C423.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Dec-2022
• ICS: 91.120.20 - Acoustics in building. Sound insulation
• Technical Committee: E33 - Building and Environmental Acoustics
• Drafting Committee: E33.01 - Sound Absorption

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E795 − 23
Standard Practices for
1
Mounting Test Specimens During Sound Absorption Tests
This standard is issued under the fixed designation E795; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3.2.1 The following terms have the meaning noted for these
practices only:
1.1 These practices cover test specimen mountings to be
3.2.2 sound-absorbing units—consists of test specimens
used during sound absorption tests performed in accordance
that are in direct contact with or suspended from ceilings,
with Test Method C423.
walls, or other room surfaces.
1.2 The values stated in SI units are to be regarded as
3.2.2.1 Discussion—Sound-absorbing units include, but are
standard. The values given in parentheses are mathematical
not limited to, baffles, draperies, space absorbers, volume
conversions to inch-pound units that are provided for informa-
absorbers (bass traps), and other three-dimensional objects.
tion only and are not considered standard.
3.2.3 test surface—any hard surface over which the test
1.3 This international standard was developed in accor-
specimen or test specimen mounting is placed for testing in
dance with internationally recognized principles on standard-
accordance with Test Method C423. The surface shall satisfy
ization established in the Decision on Principles for the
the room construction requirements of Test Method C423.
Development of International Standards, Guides and Recom-
3.2.3.1 Discussion—In most cases, the surface will be the
mendations issued by the World Trade Organization Technical
floor of the reverberation room.
Barriers to Trade (TBT) Committee.
4. Significance and Use
2. Referenced Documents
4.1 The sound absorption of a material that covers a flat
2
2.1 ASTM Standards: surface depends not only on the physical properties of the
C423 Test Method for Sound Absorption and Sound Absorp- material but also on the way in which the material is mounted
tion Coefficients by the Reverberation Room Method over the surface. The mountings specified in these practices are
C634 Terminology Relating to Building and Environmental intended to simulate in the laboratory conditions that exist in
Acoustics normal use.
2.2 ISO Standard:
4.2 Some of the specified mountings require special fixtures
ISO 354 Measurement of Sound Absorption in a Reverbera-
or minor deviations from normal practice. These fixtures or
3
tion Room
deviations are to be used only during laboratory tests and
should not be specified for practical installations. They are
3. Terminology
noted in the specifications for the mountings in question by the
phrase “for laboratory testing only.”
3.1 Except as noted in 4.2, the terms used in these practices
are defined in Terminology C634.
4.3 Test reports may refer to these mountings by type
designation instead of providing a detailed description of the
3.2 Definitions of Terms Specific to This Standard:
mounting used.
5. Classification
1
These practices are under the jurisdiction of ASTM Committee E33 on
5.1 The mountings are designated as follows:
Building and Environmental Acoustics and are the direct responsibility of Subcom-
mittee E33.01 on Sound Absorption.
5.1.1 Type A Mounting—Test specimen laid directly against
Current edition approved Jan. 1, 2023. Published March 2023. Originally
the test surface (described in detail in Section 6).
approved in 1981. Last previous edition approved in 2016 as E795 – 16. DOI:
5.1.2 Type B Mounting—Test specimen cemented to gyp-
10.1520/E0795-23.
2
sum board and laid directly against the test surface (described
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
in detail in Section 7).
Standards volume information, refer to the standard’s Document Summary page on
5.1.3 Type C Mounting—Test specimen comprising sound-
the ASTM website.
3
absorptive material behind a perforated, expanded, open facing
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036. or other porous material (described in detail in Section 8).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E795 − 23
5.1.4 Type D Mounting—Test specimen mounted on
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E795 − 16 E795 − 23
Standard Practices for
1
Mounting Test Specimens During Sound Absorption Tests
This standard is issued under the fixed designation E795; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 These practices cover test specimen mountings to be used during sound absorption tests performed in accordance with Test
Method C423.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C634 Terminology Relating to Building and Environmental Acoustics
2.2 ISO Standard:
3
ISO 354 Measurement of Sound Absorption in a Reverberation Room
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Except as noted in 4.2, the terms used in these practices are defined in Terminology C634.
3.1 The following terms haveExcept as noted in 4.2the meaning noted for these practices only:, the terms used in these practices
are defined in Terminology C634.
3.2.1 sound-absorbing units — consists of test specimens that are in direct contact with or suspended from ceilings, walls, or other
room surfaces. Sound-absorbing units include, but are not limited to, baffles, draperies, space absorbers, volume absorbers (bass
traps), and other three-dimensional objects.
1
These practices are under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and are the direct responsibility of Subcommittee E33.01
on Sound Absorption.
Current edition approved May 15, 2016Jan. 1, 2023. Published June 2016March 2023. Originally approved in 1981. Last previous edition approved in 20122016 as
E795 – 05 (2012).E795 – 16. DOI: 10.1520/E0795-16.10.1520/E0795-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E795 − 23
3.2.2 test surface—any hard surface over which the test specimen or test specimen mounting is placed for testing in accordance
with Test Method C423. The surface shall satisfy the room construction requirements of Test Method C423. In most cases, the
surface will be the floor of the reverberation room.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 The following terms have the meaning noted for these practices only:
3.2.2 sound-absorbing units—consists of test specimens that are in direct contact with or suspended from ceilings, walls, or other
room surfaces.
3.2.2.1 Discussion—
Sound-absorbing units include, but are not limited to, baffles, draperies, space absorbers, volume absorbers (bass traps), and other
three-dimensional objects.
3.2.3 test surface—any hard surface over which the test specimen or test specimen mounting is placed for testing in accordance
with Test Method C423. The surface shall satisfy the room construction requirements of Test Method C423.
3.2.3.1 Discussion—
In most cases, the surface will be the floor of the reverberation room.
4. Significance and Use
4.1 The sound absorption of a material that covers a flat surface depends not only on the physical properties of the material but
also on the way in which the material is mounted over the surface. The mountings specified in these practices are intended to
simulate in the laboratory conditions that exis
...