1、Designation:D177998(Reapproved 2017)Standard Specification forAdhesive for Acoustical Materials1This standard is issued under the fixed designation D1779;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 U.S.Department of Defense.1.Scope1.1 This specification covers an adhesive for bonding pre-fab
3、ricated acoustical materials to the inside walls and ceilingsof rooms in buildings.This adhesive is required to maintain atensile adhesion(bond strength)of not less than 3.45 104dynes/cm2(12lb/in.2)for a long period of time under thetemperature and moisture conditions likely to be encounteredand to
4、maintain sufficient plasticity to allow for movement ofparts of the building as it ages.NOTE1Cleanliness of SurfaceThe surface to which the acousticalmaterial is applied with the adhesive should be clean,sound,and dry.Surface coatings should be removed if their nature indicates an unsatis-factory in
5、stallation,so that the adhesive can be applied to the base.Whenthe adhesive is to be applied on a painted surface,test tile should beapplied for 48 h to determine suitable adherence of the coating byexamination.Acoustical adhesives are not intended to be applied tosurfaces that are moist and that ha
6、ve an alkaline reaction,or that may laterbecome moist or alkaline.Such surfaces,as concrete or plaster,should beproperly dried and aged before applying the adhesive.NOTE2LoadThis adhesive is not recommended as a sole means ofholding acoustical materials weighing more than 121 kg/m2(212lb/ft2)toceili
7、ng surfaces.NOTE3Amount and Condition of MaterialIt is recommended thatsufficient adhesive be used so that there is a contact surface of not less than1.2 104cm2/m2(20 in.2/ft2)of acoustical material,with a minimumthickness of 0.3 cm(18in.)and that the adhesive be applied in fourseparate nearly spher
8、ical portions of approximately equal size near thecorners for a standard 30.5 by 30.5-cm(12 by 12-in.)tile.Fewer than ormore than four portions for 30.5 by 30.5-cm tile are not recommended dueto difficulty in leveling and in securing effective contact area on allportions.Adhesives that are hard,or d
9、o not wet the surface,or are difficultto spread should not be used.NOTE4Rigidity of Base SurfacesIt is necessary that the materialforming the base to which the adhesive is attached should be relativelysmooth,firm,and rigid.If the pressure of applying tile and adhesivecauses the base material to defl
10、ect excessively,tile previously applied mayhave their adhesive bond broken.This occurs on some types of gypsumboard suspension systems.NOTE5AgingTo date,no accelerated aging tests for adhesives havebeen developed to duplicate exactly aging in service.The aging tests inthis specification are designed
11、 to accelerate the aging process and to testvarious manifestations of aging,and are intended to be satisfactory forcomparing one adhesive with another;they do not necessarily reflect agingcharacteristics on an absolute basis.Purchasers of adhesives shouldreceive from the manufacturer additional warr
12、anties and assurances ofperformance of the adhesive under normal aging.NOTE6Erection PracticesProper erection techniques are essentialfor proper performance of any acoustical adhesive.Use of a materialmeeting this specification will not in itself guarantee satisfactory perfor-mance.Only when tiles a
13、re applied by skilled and experienced workersfollowing instructions from the manufacturer can the purchaser be assuredof satisfactory performance of an adhesive.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standa
14、rd does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This internatio
15、nal standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee
16、.2.Referenced Documents2.1 ASTM Standards:2C37/C37M Specification for Gypsum Lath(Withdrawn2004)3D618 Practice for Conditioning Plastics for TestingD907 Terminology of AdhesivesE104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Solutions1This specification is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.70 on ConstructionAdhesives.Current edition approved Nov.1,2017.Published November 2017.Originallyapprove
