1、Designation: E1042 02 (Reapproved 2008)1Standard Classification forAcoustically Absorptive Materials Applied by Trowel orSpray1This standard is issued under the fixed designation E1042; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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.1NOTE1.2, units of measure stateme
3、nt, was editorially inserted and 5.5.1 and 5.5.2 were editorially updated in May 2010.1. Scope1.1 This classification covers materials applied by trowel orspray to surfaces for the purpose of increasing their acousticalabsorption.1.2 The values stated in SI units are to be regarded asstandard. No ot
4、her units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2C423 Test Method for Sound Absorption and Sound Ab-sorption Coefficients by the Reverberation Room MethodC634 Terminology Relating to Building and EnvironmentalAcousticsE84 Test Method for Surface Burnin
5、g Characteristics ofBuilding MaterialsE795 Practices for Mounting Test Specimens During SoundAbsorption TestsE859 Test Method forAir Erosion of Sprayed Fire-ResistiveMaterials (SFRMs) Applied to Structural Members3. Terminology3.1 Definitions:3.1.1 The acoustical terminology used in this classificat
6、ionis consistent with Terminology C634.3.1.2 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 from 200 through 2500 Hz, inclusive,measured according to C423.4. Sig
7、nificance 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 by trowel or by spray.5. Basis of Classification5.1 Classification is
8、 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 cementitious. Type I ingredientsshall be uniformly mixed and ready for use
9、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 be of such a consistency that itcan be applied with a plastering tro
10、wel 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 the time of application.5.2.3 Type III, Material is cellular plastic
11、 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 material according to its noise reductioncoefficient (NRC) shall be as foll
12、ows:1This classification is under the 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
13、 1985. Last previous edition approved in 2002 as E1042 02. DOI:10.1520/E1042-02R08E01.2For 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
14、 page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 0.50
15、NRC 45 0.45NRC 40 0.40NRC low 0.00NOTE 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 accordance with 6.1.NOTE 3Since SAAis replacing
16、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. Ratings based on data measured before Test Meth
17、od C423 requiredSAA may use NRC. See Test Method C423 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 acousticalmaterial shall not exceed 25 when tes
18、ted 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 requirements.In addition, Class (a) materials sha
19、ll 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 index shall not exceed200 on the exposed surfac
20、e 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 themanufacturer.5.5 Dust PropensityClassific
21、ation of acoustically absorp-tive material according to its dust propensity shall be asfollows:5.5.1 Category ADust removed shall not exceed 0.27g/m2when tested in accordance with Test Method E859.5.5.2 Category BDust removed is greater than 0.27 g/m2when tested in accordance with Test Method E859.N
22、OTE 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 coefficients ofthe absorptive material shall be determined in accordan
23、ce withTest Method C423 using Type I mounting as defined inPractices E795. A separate measurement of absorption shall beperformed for each NRC grade under this standard classifica-tion.6.2 Flame-Spread Index (see 5.4)The flame-spread indexshall be determined in accordance with Test Method E84.6.3 Du
24、st Test (see 5.5)When required, the dust test shallbe performed in accordance with Test Method E859 except thatthe measurements of the dust collected will be terminated afterthe first 24-h test period. The reported dust removed will be thedifference between the amounts of dust collected at the end o
25、fthe 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-onmaterialsASTM International takes no position respecting the validity of
26、any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to r
27、evision 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 standardsand should be addressed to ASTM International Headquarters. Yo
28、ur comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is cop
29、yrighted 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E1042 02 (2008)12
