1、Designation: E 1042 02Standard 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 revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 covers materials a
3、pplied by trowel orspray to surfaces for the purpose of increasing their acousticalabsorption.2. Referenced Documents2.1 ASTM Standards:C 423 Test Method for Sound Absorption and Sound Ab-sorption Coefficients by the Reverberation Room Method2C 634 Terminology Relating to Environmental Acoustics2E 8
4、4 Test Method for Surface Burning Characteristics ofBuilding Materials3E 795 Practices for Mounting Test Specimens DuringSound Absorption Tests2E 859 Test Method for Air Erosion of Sprayed Fire-Resistive Materials Applied to Structural Members43. Terminology3.1 Definitions:3.1.1 The acoustical termi
5、nology 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 from 200 through 2500 Hz, inclusive,m
6、easured 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 by trowel or by spray.5. Basis of Cl
7、assification5.1 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 cementitious. Type I ingredientsshall be u
8、niformly 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 be of such a consistency that itcan
9、 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 the time of application.5.2.3 Type
10、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 material according to its noise reductionc
11、oefficient (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 0.00NOTE 1Because sound absorption varies with product thickness,informat
12、ion 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 6.1.1This classification is under the jurisdiction of ASTM Committee E33 onEnvironmental Acoustics and is the direct responsibility of
13、Subcommittee E33.04 onApplication of Acoustical Materials and Systems.Current edition approved Oct. 10, 2002. Published October 2002. Originallypublished as E 1042 85. Last previous edition E 1042 92 (1997)e1.2Annual Book of ASTM Standards, Vol 04.06.3Annual Book of ASTM Standards, Vol 04.07.4Annual
14、 Book of ASTM Standards, Vol 04.11.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 3Since SAA is replacing NRC, SAA values may be used in lieuof NRC when rating material according to this standard classification.However, the NRC
15、 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 Method C 423 requiredSAA may use NRC. See Test Method C 423 for more discussion of NRCand SAA.5.4 Flame Spread IndexAcoustic
16、ally 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 tested in accordance withTest Method E 84, nor shall the material show evidence ofprogressive combustion after the test f
17、lame 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 shall have a smoke developedrating not to exceed 50 when tested in accordance with TestMethod E 84.5.4.2 Class (b)The fl
18、ame-spread index shall not exceed75 on the exposed surface when tested in accordance with TestMethod E 84.5.4.3 Class (c)The flame-spread index shall not exceed200 on the exposed surface when tested in accordance withTest Method E 84.NOTE 4For example: A Type II, NRC 50, at x cm (y in.) of applicati
19、onclass (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 PropensityClassification of acoustically absorp-tive material according to its dust propensity shall be asfollows:5.5.1 Category AD
20、ust 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 0.27 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 certa
21、in 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 accordance withTest Method C 423 using Type I mounting as defined inPractices E 795. A separ
22、ate 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 E 84.6.3 Dust Test (see 5.5)When required, the dust test shallbe performed in accordance wit
23、h Test Method E 859 exceptthat the measurements of the dust collected will be terminatedafter the first 24-h test period. The reported dust removed 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 mat
24、erials; 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 any patent rights asserted in connection with any item mentionedin this standard
25、. 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 revision at any time by the responsible technical committee and must be reviewed
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27、chnical 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 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).E1042022
