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ASTM E1042-02(2008)

(Classification)

Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray

Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray

SIGNIFICANCE AND USE
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.
SCOPE
1.1 This classification covers materials applied by trowel or spray to surfaces for the purpose of increasing their acoustical absorption.

General Information

Status
Historical
Publication Date
14-Mar-2008
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.04 - Application of Acoustical Materials and Systems
Current Stage
Ref Project

Relations

Replaces
ASTM E1042-02 - Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray
Effective Date
15-Mar-2008
Replaced By
ASTM E1042-02(2008)e1 - Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray
Effective Date
15-Mar-2008
Referred By
ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
Effective Date
15-Mar-2008

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Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E1042 – 02 (Reapproved 2008)
Standard Classification for
Acoustically Absorptive Materials Applied by Trowel or
Spray
This standard is issued under the fixed designation E1042; 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 Department of Defense.
1. Scope provides a classification method for acoustically absorptive
materials applied directly to surfaces by trowel or by spray.
1.1 This classification covers materials applied by trowel or
spray to surfaces for the purpose of increasing their acoustical
5. Basis of Classification
absorption.
5.1 Classification is made according to type of material,
2. Referenced Documents acoustical properties, flame spread, and dust propensity.
2 5.2 Material Type—Classificationofacousticallyabsorptive
2.1 ASTM Standards:
material according to material type is as follows:
C423 Test Method for Sound Absorption and Sound Ab-
5.2.1 Type I—Material is cementitious. Type I ingredients
sorption Coefficients by the Reverberation Room Method
shall be uniformly mixed and ready for use by the addition of
C634 Terminology Relating to Building and Environmental
water.When received, the material in the container shall be dry
Acoustics
and shall not be caked or sticky. After the material has been
E84 Test Method for Surface Burning Characteristics of
properly mixed with the amount of water specified by the
Building Materials
manufacturer, the material shall be of such a consistency that it
E795 Practices for Mounting Test Specimens During Sound
can be applied with a plastering trowel or with a suitable
Absorption Tests
plaster-spraying machine.
E859 TestMethodforAirErosionofSprayedFire-Resistive
5.2.2 Type II, Material is fibrous. Type II material shall
Materials (SFRMs) Applied to Structural Members
consist of mineral or organic fiber with an integrally mixed
3. Terminology
binder, or it may be supplied for use with a liquid binder added
at the time of application.
3.1 Definitions:
5.2.3 Type III, Material is cellular plastic and is intended for
3.1.1 The acoustical terminology used in this classification
application over beams, walls, ceilings, and columns. Type III
is consistent with Terminology C634.
materials are normally designed to be mixed at the time of
3.1.2 Sound absorption average (SAA)—a single number
application.
rating, the average, rounded off to the nearest 0.01, of the
5.3 Noise Reduction Coeffıcient—Classification of acousti-
sound absorption coefficients of a material for the twelve
cally absorptive material according to its noise reduction
one-third octave bands from 200 through 2500 Hz, inclusive,
coefficient (NRC) shall be as follows:
measured according to C423.
NRC Grade Designation Minimum Acceptable
NRC or SAA
4. Significance and Use
4.1 Acoustically absorptive materials are used for the con-
NRC 95 0.95
NRC 90 0.90
trol of reverberation and echoes in rooms. This standard
NRC 85 0.85
NRC 80 0.80
1 NRC 75 0.75
This classification is under the jurisdiction of ASTM Committee E33 on
NRC 70 0.70
Building and Environmental Acoustics and is the direct responsibility of Subcom-
NRC 65 0.65
mittee E33.04 on Application of Acoustical Materials and Systems.
NRC 60 0.60
Current edition approved March 15, 2008. Published June 2008. Originally
NRC 55 0.55
approved 1985. Last previous edition approved in 2002 as E1042 – 02. DOI:
NRC 50 0.50
10.1520/E1042-02R08.
NRC 45 0.45
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NRC 40 0.40
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
NRC low 0.00
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1042 – 02 (2008)
NOTE 1—Because sound absorption varies with product thickness,
5.5 Dust Propensity—Classification of acoustically absorp-
information on the required thickness and
...


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.
e1
Designation:E1042–92(Reapproved 1997) Designation: E 1042 – 02 (Reapproved 2008)
Standard Classification for
Acoustically Absorptive Materials Applied by Trowel or
Spray
This standard is issued under the fixed designation E 1042; 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 Department of Defense.
e NOTE—Keywords were added editorially in March 1997.
1. Scope
1.1 This classification covers materials applied by trowel or spray to surfaces for the purpose of increasing their acoustical
absorption.
2. Referenced Documents
2.1 ASTM Standards:
C 423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C 634 Terminology Relating to Building and Environmental Acoustics
E 84 Test Method for Surface Burning Characteristics of Building Materials
E 795 Practices for Mounting Test Specimens During Sound Absorption Tests
E 859 Test Method for Air Erosion of Sprayed Fire-Resistive Materials (SFRMs) Applied to Structural Members
3. Terminology
3.1 Definitions:
3.1.1 The acoustical terminology used in this classification is consistent with Terminology C 634.
3.1.2 Sound absorption average (SAA)—a single number rating, the average, rounded off to the nearest 0.01, of the sound
absorption coefficients of a material for the twelve one-third octave bands from 200 through 2500 Hz, inclusive, measured
according to C 423.
4. Significance and Use
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.
5. Basis of Classification
5.1 Classification is made according to type of material, acoustical properties, flame spread, and dust propensity.
5.2 Material Type— Classification of acoustically absorptive material according to material type is as follows:
5.2.1 Type I—Material is cementitious. Type I ingredients shall be uniformly mixed and ready for use by the addition of water.
When received, the material in the container shall be dry and shall not be caked or sticky. After the material has been properly
mixed with the amount of water specified by the manufacturer, the material shall be of such a consistency that it can be applied
with a plastering trowel or with a suitable plaster-spraying machine.
5.2.2 Type II, Material is fibrous. Type II material shall consist of mineral or organic fiber with an integrally mixed binder, or
it may be supplied for use with a liquid binder added at the time of application.
5.2.3 Type III, Material is cellular plastic and is intended for application over beams, walls, ceilings, and columns. Type III
materials are normally designed to be mixed at the time of application.
This classification is under the jurisdiction of ASTM Committee E-33E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee
E33.04 on Application of Acoustical Materials and Systems.
Current edition approved March 15, 1992.2008. Published May 1992.June 2008. Originally published as E1042–85. approved 1985. Last previous edition
E1042–85´ .approved in 2002 as E 1042 – 02.
Annual Book of ASTM Standards, Vol 04.06.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 1042 – 02 (2008)
5.3 Noise Reduction Coeffıcient —Classification of acoustically absorptive material according to its noise reduction coefficient
(NRC) shall be as follows:
NRC Grade Designation Minimum Acceptable NRC
NRC Grade Designation Minimum Acceptable
NRC or SAA
NRC 95 0.95
NRC 90 0.90
NRC 85 0.85
NRC 80 0.80
NRC 75 0.75
NRC 70 0.70
NRC 65 0.65
NRC 60 0.60
NRC 55 0.55
NRC 50 0.50
NRC 45 0.45
NRC 40 0.40
NRC low 0.00
NOTE 1—Because
...

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5.1 Sound transmission loss as defined in Terminology C634, refers to the response of specimens exposed to a diffuse incident sound field, and this is the test condition approached by this laboratory test method. The test results are therefore most directly relevant to the performance of similar specimens exposed to similar sound fields. They provide, however, a useful general measure of performance for the variety of sound fields to which a partition or element may typically be exposed.  
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SIGNIFICANCE AND USE
5.1 The spectrum of the noise in the room below the test specimen is determined by the following:  
5.1.1 The size and the mechanical properties of the floor-ceiling assembly, such as its construction, surface, mounting or edge restraints, stiffness, or internal damping,  
5.1.2 The acoustical response of the room below,  
5.1.3 The placement of the object or device producing the impacts, and  
5.1.4 The nature of the actual impact itself.  
5.2 This test method is based on the use of a standardized tapping machine of the type specified in 8.1 placed in specific positions on the floor. This machine produces a continuous series of uniform impacts at a uniform rate on a test floor and generates in the receiving room broadband sound pressure levels that are sufficiently high to make measurements possible beneath most floor types even in the presence of background noise. The tapping machine itself, however, is not designed to simulate any one type of impact, such as produced by male or female footsteps.  
5.3 Because of its portable design, the tapping machine does not simulate the weight of a human walker. Therefore, the structural sounds, i.e., creaks or booms of a floor assembly caused by such footstep excitation is not reflected in the single number impact rating derived from test results obtained by this test method. The degree of correlation between the results of tapping machine tests in the laboratory and the subjective acceptance of floors under typical conditions of domestic impact excitation is uncertain. The correlation will depend on both the type of floor construction and the nature of the impact excitation in the building.  
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SCOPE
1.1 This test method covers the laboratory measurement of impact sound transmission of floor-ceiling assemblies using a standardized tapping machine. It is assumed that the test specimen constitutes the primary sound transmission path into a receiving room located directly below and that a good approximation to a diffuse sound field exists in this room.  
1.2 Measurements may be conducted on floor-ceiling assemblies of all kinds, including those with floating-floor or suspended ceiling elements, or both, and floor-ceiling assemblies surfaced with any type of floor-surfacing or floor-covering materials.  
1.3 This test method prescribes a uniform procedure for reporting laboratory test data, that is, the normalized one-third octave band sound pressure levels transmitted by the floor-ceiling assembly due to the tapping machine.  
1.4 Laboratory Accreditation—The requirements for accrediting a laboratory for performing this test method are given in Annex A2.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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.  
1.7 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.

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ASTM
ASTM C634-22(Terminology)
Standard Terminology Relating to Building and Environmental Acoustics

SIGNIFICANCE AND USE
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.  
3.2 Definitions of Terms Specific to Each Standard:  
3.2.1 As indicated in Section 4, terms and their definitions are intended to provide a precise understanding and interpretation of the building and environmental acoustic test standards in which they appear.  
3.2.2 A specific definition of a given term is applicable to the standard or standards in which the term is described and used.  
3.2.3 Different definitions of the same term are acceptable provided each one is consistent with and is not in conflict with the standard definition for the same term, that is, the general concept the term describes.  
3.2.4 If a standard under the jurisdiction of ASTM Committee E33 specially defines a term, i.e. provides a definition different in any way from what is given in Section 4 of Terminology C634, that standard shall list the term and its description under the subheading, Definitions of Terms Specific to This Standard.
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.  
3.3 Definitions for some terms associated with building and environmental acoustic issues and not included in Terminology C634 are found in ISO/TR 25417 or IEEE P260.4. When discrepancies exist, the definition in Terminology C634 shall prevail.
SCOPE
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.  
1.2 This building and environmental acoustics standard cannot be used to provide quantitative measures.  
1.3 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.  
1.4 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.

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ASTM
ASTM C522-03(2022)(Test Method)
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.

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