ASTM_E_1042_-_02_2014.pdf

Designation:E104202(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,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 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 MethodC634 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 Structural 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 twelveone-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 applied 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:5.2.1 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 themanufacturer,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 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 acousti-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 Materials 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 serviceastm.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 States1 NRC Grade DesignationMinimum AcceptableNRC or SAANRC 950.95NRC 900.90NRC 850.85NRC 800.80NRC 750.75NRC 700.70NRC 650.65NRC 600.60NRC 550.55NRC 500.50NRC 450.45NRC 400.40NRC low0.00NOTE1Because sound absorption varies with product thickness,information on the required thickness and measurement method for aparticular grade must be supplied by the manufacturer.NOTE2Determine NRC or SAA values in accordance with 6.1.NOTE3Since 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.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 asfollows: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 b