1、Designation: E 1042 02 (Reapproved 2008)Standard Classification forAcoustically Absorptive Materials Applied by Trowel orSpray1This standard is issued under the fixed designation E 1042; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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. Scope1.1 This classification c
3、overs materials applied by trowel orspray to surfaces for the purpose of increasing their acousticalabsorption.2. Referenced Documents2.1 ASTM Standards:2C 423 Test Method for Sound Absorption and Sound Ab-sorption Coefficients by the Reverberation Room MethodC 634 Terminology Relating to Building a
4、nd Environmen-tal AcousticsE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE 795 Practices for Mounting Test Specimens DuringSound Absorption TestsE 859 Test Method for Air Erosion of Sprayed Fire-Resistive Materials (SFRMs) Applied to Structural Mem-bers3. Terminology3.1 Def
5、initions:3.1.1 The acoustical terminology used in this classificationis consistent with Terminology C 634.3.1.2 Sound absorption average (SAA)a single numberrating, the average, rounded off to the nearest 0.01, of thesound absorption coefficients of a material for the twelveone-third octave bands fr
6、om 200 through 2500 Hz, inclusive,measured according to C 423.4. Significance and Use4.1 Acoustically absorptive materials are used for the con-trol of reverberation and echoes in rooms. This standardprovides a classification method for acoustically absorptivematerials applied directly to surfaces b
7、y trowel or by spray.5. Basis of Classification5.1 Classification is made according to type of material,acoustical properties, flame spread, and dust propensity.5.2 Material TypeClassification of acoustically absorptivematerial according to material type is as follows:5.2.1 Type IMaterial is cementi
8、tious. Type I ingredientsshall be uniformly mixed and ready for use by the addition ofwater. When received, the material in the container shall be dryand shall not be caked or sticky. After the material has beenproperly mixed with the amount of water specified by themanufacturer, the material shall
9、be of such a consistency that itcan be applied with a plastering trowel or with a suitableplaster-spraying machine.5.2.2 Type II, Material is fibrous. Type II material shallconsist of mineral or organic fiber with an integrally mixedbinder, or it may be supplied for use with a liquid binder addedat
10、the time of application.5.2.3 Type III, Material is cellular plastic and is intended forapplication over beams, walls, ceilings, and columns. Type IIImaterials are normally designed to be mixed at the time ofapplication.5.3 Noise Reduction CoeffcientClassification of acousti-cally absorptive materia
11、l according to its noise reductioncoefficient (NRC) shall be as follows:NRC Grade Designation Minimum AcceptableNRC or SAANRC 95 0.95NRC 90 0.90NRC 85 0.85NRC 80 0.80NRC 75 0.75NRC 70 0.70NRC 65 0.65NRC 60 0.60NRC 55 0.55NRC 50 0.50NRC 45 0.45NRC 40 0.40NRC low 0.001This classification is under the
12、jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and is the direct responsibility of Subcom-mittee E33.04 on Application of Acoustical Materials and Systems.Current edition approved March 15, 2008. Published June 2008. Originallyapproved 1985. Last previous edition approved
13、in 2002 as E 1042 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr
14、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1Because sound absorption varies with product thickness,information on the required thickness and measurement method for aparticular grade must be supplied by the manufacturer.NOTE 2Determine NRC or SAA values in accorda
15、nce with 6.1.NOTE 3Since SAAis replacing NRC, SAAvalues may be used in lieuof NRC when rating material according to this standard classification.However, the NRC nomenclature is retained as the classification label. Itis recommended that ratings based on newly acquired absorption data useSAA. Rating
16、s based on data measured before Test Method C 423 requiredSAA may use NRC. See Test Method C 423 for more discussion of NRCand SAA.5.4 Flame Spread IndexAcoustically absorptive materialshall be classified according to its flame spread index asfollows:5.4.1 Class (a)The flame-spread index of the acou
17、sticalmaterial shall not exceed 25 when tested in accordance withTest Method E84, nor shall the material show evidence ofprogressive combustion after the test flame is extinguished. Allsurfaces, including those which would be exposed by cuttingthrough the material in any way, shall meet these requir
18、ements.In addition, Class (a) materials shall have a smoke developedrating not to exceed 50 when tested in accordance with TestMethod E84.5.4.2 Class (b)The flame-spread index shall not exceed75 on the exposed surface when tested in accordance with TestMethod E84.5.4.3 Class (c)The flame-spread inde
19、x shall not exceed200 on the exposed surface when tested in accordance withTest Method E84.NOTE 4For example:AType II, NRC 50, at x cm (y in.) of applicationclass (b) material is fibrous, has an NRC of 0.5 or and has a flame-spreadindex of less than 75. The value for x (and y) must be specified by t
20、hemanufacturer.5.5 Dust PropensityClassification of acoustically absorp-tive material according to its dust propensity shall be asfollows:5.5.1 Category ADust removed shall not exceed 0.27g/m2(0.025 g/ft2) when tested in accordance with Test MethodE 859.5.5.2 Category BDust removed is greater than 0
21、.27 g/m2(0.025 g/ft2) when tested in accordance with Test MethodE 859.NOTE 5Classification according to dust propensity is usually speci-fied only by certain agencies of the US Government.6. Test Methods6.1 Sound Absorption Test (see 5.3)Sound absorption,sound absorption average, and noise reduction
22、 coefficients ofthe absorptive material shall be determined in accordance withTest Method C 423 using Type I mounting as defined inPractices E 795.Aseparate measurement of absorption shall beperformed for each NRC grade under this standard classifica-tion.6.2 Flame-Spread Index (see 5.4)The flame-sp
23、read indexshall be determined in accordance with Test Method E84.6.3 Dust Test (see 5.5)When required, the dust test shallbe performed in accordance with Test Method E 859 exceptthat the measurements of the dust collected will be terminatedafter the first 24-h test period. The reported dust removed
24、willbe the difference between the amounts of dust collected at theend of the 6-h and the 24-h purging periods.7. Keywords7.1 acoustically absorptive materials; dust propensity;flame-spread index; noise reduction coefficient; sound absorp-tion; sound absorption average; spray-on materials; trowel-onm
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26、hts, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional
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28、 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E 1042 02 (2008)2
