1、Designation:C635/C635M13aStandard Specification forthe Manufacture,Performance,and Testing of MetalSuspension Systems for Acoustical Tile and Lay-in PanelCeilings1This standard is issued under the fixed designation C635/C635M;the number immediately following the designation indicates the yearof orig
2、inal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript 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 Def
3、ense.1.Scope1.1 This specification covers metal ceiling suspension sys-tems used primarily to support acoustical tile or acousticallay-in panels.1.2 Some suspension systems incorporate locking assemblydetails that enhance performance by providing some continuityor load transfer capability between ad
4、jacent sections of theceiling grid.The test methods included in this specification donot provide the means for making a complete evaluation ofcontinuous beam systems,nor for assessing the continuitycontribution to overall system performance.However,the testmethods can be used for evaluating primary
5、structural mem-bers in conjunction with secondary members that interlock,aswell as with those of noninterlocking type.1.3 While this specification is applicable to the exteriorinstallation of metal suspension systems,the atmosphericconditions and wind loading require additional design attentionto en
6、sure safe implementation.For that reason,a specificreview and approval should be solicited from the responsiblearchitect and engineer,or both,for any exterior application ofmetal suspension systems in the construction of a new buildingor building modification.1.4 The values stated in either SI units
7、 or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 The following safety hazard
8、s caveat pertains only to thetest methods described in this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the appl
9、icability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusD1735 Practice for Testing Water Resistance of CoatingsUsing Water Fog Apparatus3.Terminology3.1 Definitions:3.1.1 Where these terms appear in this specificat
10、ion theyshall have the meaning herein indicated as follows:3.1.1.1 backing boarda flat sheet of gypsum board towhich acoustical tile is attached using adhesive,screws,staples,or other suitable means(Fig.1c).3.1.1.2 bowthe maximum component of deviation in thevertical plane of a main runner,cross run
11、ner,or wall moldingwhere the centroidal axis of these structural components hasbeen permanently deformed from end to end into the shape ofa simple regular curve during the manufacturing process(Fig.2).NOTE1The meanings for bow and camber given here may differ fromthose applied elsewhere.3.1.1.3 camb
12、erthe maximum component of deviation inthe horizontal plane of a main runner,cross runner,or wallmolding where the centroidal axis of these structural compo-nents has been permanently deformed from end to end into theshape of a simple regular curve during the manufacturingprocess(Fig.2).3.1.1.4 carr
13、ying channel or hanging channelthe three-sided or“”-shaped metal sections that support the entirestructural grid network in some forms of mechanical ceiling1This specification is under the jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and is the direct responsibility of S
14、ubcom-mittee E33.04 on Application of Acoustical Materials and Systems.Current edition approved Sept.1,2013.Published December 2013.Originallyapproved in 1969.Last previous edition approved in 2013 as C635 13.DOI:10.1520/C0635_C0635M-13A.2For referenced ASTM standards,visit the ASTM website,www.astm
15、.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 FIG.1 Three Types
16、of Ceiling Suspension Systems Showing All ComponentsC635/C635M 13a2 suspension systems(Fig.1b).The carrying channels areusually suspended by hanger wires from the existing structureand the main runners are then attached to the channels.3.1.1.5 ceiling suspension systemthe entire network orgrid of structural components,as defined by the ceilingsuspension system manufacturer,that provides support foracoustical ceiling tile,acoustical ceiling panels,lightingfixtures,and air diffusers.3.1.1.6 cross