1、Designation: E1042 02 (Reapproved 2014)Standard 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 revision
2、, 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.1. Scope1.1 This classification covers materials applied by trowel orspray to surfaces for the purpose of increasing
3、 their acousticalabsorption.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2C423 Test Method for SoundAbsorption and SoundAbsorp-tion Coefficients by the Reverberation Room MethodC6
4、34 Terminology Relating to Building and EnvironmentalAcousticsE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE795 Practices for Mounting Test Specimens During SoundAbsorption TestsE859 Test Method for Air Erosion of Sprayed Fire-ResistiveMaterials (SFRMs) Applied to Structur
5、al Members3. Terminology3.1 Definitions:3.1.1 The acoustical terminology used in this classificationis 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 t
6、welveone-third octave bands from 200 through 2500 Hz, inclusive,measured according to C423.4. 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 a
7、pplied directly to surfaces by 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.
8、2.1 Type IMaterial is cementitious. 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 themanu
9、facturer, the material shall 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
10、with a liquid binder addedat 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 aco
11、usti-cally absorptive material according to its noise reductioncoefficient (NRC) shall be as follows: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 Mater
12、ials and Systems.Current edition approved March 1, 2014. Published March 2014. Originallyapproved 1985. Last previous edition approved in 2008 as E1042 02(2008)1.DOI: 10.1520/E1042-02R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servicea
13、stm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1NRC Grade Designation Minimum AcceptableNRC or SAANRC 95 0.9
14、5NRC 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,information on the required thickness and measurement method for aparticular grade must be supplied by th
15、e manufacturer.NOTE 2Determine NRC or SAA values in accordance 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 rat
16、ings based on newly acquired absorption data useSAA. Ratings based on data measured before Test Method 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 as
17、follows:5.4.1 Class (a)The flame-spread index of the acousticalmaterial 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 cuttin
18、gthrough 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 E84.5.4.2 Class (b)The flame-spread index shall not exceed 75on the exposed surface when tested in accordance
19、 with TestMethod E84.5.4.3 Class (c)The flame-spread index 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 les
20、s 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 ADust removed shall not exceed 0.27g/m2when tested in accordance with Test Method E859.5.5
21、.2 Category BDust removed is greater than 0.27 g/m2when tested in accordance with Test Method E859.NOTE 5Classification according to dust propensity is usually specifiedonly by certain agencies of the US Government.6. Test Methods6.1 Sound Absorption Test (see 5.3)Sound absorption,sound absorption a
22、verage, and noise reduction coefficients ofthe absorptive material shall be determined in accordance 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
23、Index (see 5.4)The flame-spread 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 E859 except thatthe measurements of the dust collected will be terminated afterthe first 24-h test period.
24、The reported dust removed will be thedifference between the amounts of dust collected at the end ofthe 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; spra
25、y-on materials; trowel-onmaterialsASTM International takes no position respecting the validity of 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 risko
26、f 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 every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this
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28、ur 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E1042 02 (2014)2
