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ASTM C522-03(2022)

(Test Method)

Standard Test Method for Airflow Resistance of Acoustical Materials

Standard Test Method for Airflow Resistance of Acoustical Materials

SIGNIFICANCE AND USE
5.1 The specific airflow resistance of an acoustical material is one of the properties that determine its sound-absorptive and sound-transmitting properties. Measurement of specific airflow resistance is useful during product development, for quality control during manufacture, and for specification purposes.  
5.2 Valid measurements are made only in the region of laminar airflow where, aside from random measurement errors, the airflow resistance (R = P/U) is constant. When the airflow is turbulent, the apparent airflow resistance increases with an increase of volume velocity and the term “airflow resistance” does not apply.  
5.3 The specific airflow resistance measured by this test method may differ from the specific resistance measured by the impedance tube method in Test Method E384 for two reasons. In the presence of sound, the particle velocity inside a porous material is alternating while in this test method, the velocity is constant and in one direction only. Also, the particle velocity inside a porous material is not the same as the linear velocity measured outside the specimen.
SCOPE
1.1 This test method covers the measurement of airflow resistance and the related measurements of specific airflow resistance and airflow resistivity of porous materials that can be used for the absorption and attenuation of sound. Materials cover a range from thick boards or blankets to thin mats, fabrics, papers, and screens. When the material is anisotropic, provision is made for measurements along different axes of the specimen.  
1.2 This test method is designed for the measurement of values of specific airflow resistance ranging from 100 to 10 000 mks rayls (Pa·s/m) with linear airflow velocities ranging from 0.5 mm/s to 50 mm/s and pressure differences across the specimen ranging from 0.1 Pa to 250 Pa. The upper limit of this range of linear airflow velocities is a point at which the airflow through most porous materials is in partial or complete transition from laminar to turbulent flow.  
1.3 A procedure for accrediting a laboratory for the purposes of this test method is given in Annex A1.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4.1 Table 1 is provided for user to convert into cgs units.    
cgs acoustic ohm  
mks acoustic ohm (Pa·s/m3)  
105  
cgs rayl  
mks rayl (Pa·s/m)  
10    
cgs rayl/cm  
mks rayl/m (Pa·s/m2)  
103  
cgs rayl/in.  
mks rayl/m (Pa·s/m2)  
394  
mks rayl/in.  
mks rayl/m (Pa·s/m2)  
39.4  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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
30-Sep-2022
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.01 - Sound Absorption
Current Stage
Ref Project

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ASTM C522-03(2022) - Standard Test Method for Airflow Resistance of Acoustical MaterialsASTM C522-03(2022) - Standard Test Method for Airflow Resistance of Acoustical Materials
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ASTM C522-03(2022) - Standard Test Method for Airflow Resistance of Acoustical Materials
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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:C522 −03 (Reapproved 2022)
Standard Test Method for
1
Airflow Resistance of Acoustical Materials
This standard is issued under the fixed designation C522; 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.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the measurement of airflow
E384 Test Method for Microindentation Hardness of Mate-
resistance and the related measurements of specific airflow
rials
resistanceandairflowresistivityofporousmaterialsthatcanbe
C634 Terminology Relating to Building and Environmental
used for the absorption and attenuation of sound. Materials
Acoustics
cover a range from thick boards or blankets to thin mats,
E691 Practice for Conducting an Interlaboratory Study to
fabrics, papers, and screens. When the material is anisotropic,
Determine the Precision of a Test Method
provision is made for measurements along different axes of the
specimen.
3. Terminology
1.2 This test method is designed for the measurement of
3.1 Definitions: The definitions used in this test method are
values of specific airflow resistance ranging from 100 to
contained in Terminology C634.
10 000 mks rayls (Pa·s/m) with linear airflow velocities rang-
3.2 Definitions of Terms Specific to This Standard: The
ing from 0.5 mm⁄s to 50 mm⁄s and pressure differences across
following items have been modified to exclude alternating
the specimen ranging from 0.1 Pa to 250 Pa.The upper limit of
flow.
this range of linear airflow velocities is a point at which the
3.2.1 airflow resistance, R; mks acoustic ohm
3
airflow through most porous materials is in partial or complete
(Pa·s/m )—the quotient of the air pressure difference across a
transition from laminar to turbulent flow.
specimendividedbythevolumevelocityofairflowthroughthe
specimen.
1.3 A procedure for accrediting a laboratory for the pur-
2
3.2.2 airflow resistivity, r ; mks rayl/m (Pa·s/m )—ofa
poses of this test method is given in Annex A1.
0
homogeneous material, the quotient of its specific airflow
1.4 The values stated in SI units are to be regarded as
resistance divided by its thickness.
standard. No other units of measurement are included in this
3.2.3 lateral airflow resistivity— of an anisotropic homoge-
standard.
neous material, the airflow resistivity when the direction of
1.4.1 Table 1 is provided for user to convert into cgs units.
airflowisparalleltothefaceofthematerialfromwhichthetest
1.5 This standard does not purport to address all of the specimen is taken.
safety concerns, if any, associated with its use. It is the
3.2.4 specific airflow resistance, r; mks rayl (Pa·s/m)—the
responsibility of the user of this standard to establish appro-
product of the airflow resistance of a specimen and its area.
priate safety, health, and environmental practices and deter-
This is equivalent to the air pressure difference across the
mine the applicability of regulatory limitations prior to use.
specimen divided by the linear velocity of airflow measured
1.6 This international standard was developed in accor-
outside the specimen.
dance with internationally recognized principles on standard-
3.2.5 transverse airflow resistivity— of an anisotropic ho-
ization established in the Decision on Principles for the
mogeneous material, the airflow resistivity when the direction
Development of International Standards, Guides and Recom-
of airflow is perpendicular to the face of the material from
mendations issued by the World Trade Organization Technical
which the test specimen is taken.
Barriers to Trade (TBT) Committee.
3.3 Application of Terms:
3.3.1 The term airflow resistance can be applied to speci-
mens of any kind.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding
and Environmental Acoustics and is the direct responsibility of Subcommittee
2
E33.01 on Sound Absorption. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2022. Published October 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1963. Last previous edition approved in 2016 as C522 – 03 (2016). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C0522-03R22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C522−03 (2022)
TABL
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3.1 Definitions—Terms and related definitions given in Section 4 are intended for use uniformly and consistently in all building and environmental acoustic test standards in which they appear.  
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3.2.4.1 Discussion—The mandatory language of section 3.2.4 is consistent with the mandatory language from §E2 of Form and Style for ASTM Standards (April 2020) and with the ASTM Committee E33 bylaws in place when this standard was published; it reflects a situation that exists, it does not prescribe anything.  
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1.1 This terminology covers terms, related definitions, and descriptions of terms used or likely to be used in building and environmental acoustics standards. Definitions of terms are special-purpose definitions that are consistent with the standard definitions but are written to ensure that a specific building and environmental acoustics standard is properly understood and precisely interpreted. The primary focus of this document is upon terms, definitions and descriptions found within standards under the jurisdiction of ASTM Committee E33; however, terms, definitions and descriptions that are of general interest to the field of acoustics are also included.  
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4.1 Acoustically absorptive materials are used for the control of reverberation and echoes in rooms. This standard provides a classification method for acoustically absorptive materials applied directly to surfaces by trowel or by spray.
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5.1 Acoustical performance is dependent on many factors (see Guide E1374 for a discussion on general office acoustical considerations). One of these factors is the masking sound. The masking spectrum shape and level must conform within specified tolerances throughout the treated area. The measurement and recording of these parameters are addressed in this test method.  
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1.1 This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-in panels.  
1.2 Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity or load transfer capability between adjacent sections of the ceiling grid. The test methods of Test Methods E3090/E3090M referenced in this specification do not provide the means for making a complete evaluation of continuous beam systems, nor for assessing the continuity contribution to overall system performance. However, the test methods can be used for evaluating primary structural members in conjunction with secondary members that interlock, as well as with those of noninterlocking type.  
1.3 While this specification is applicable to the exterior installation of metal suspension systems, the atmospheric conditions and wind loading require additional design attention to ensure safe implementation. For that reason, a specific review and approval should be solicited from the responsible architect and engineer, or both, for any exterior application of metal suspension systems in the construction of a new building or building modification.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.5 The following safety hazards caveat pertains only to the test methods described in this specification. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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.

  • Technical specification
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  • Technical specification
    7 pages
    English language
    sale 15% off