1、Designation: C635/C635M 07 C635/C635M 12Standard 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 indicat
2、es the yearof original 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 th
3、e Department of Defense.1. Scope1.1 This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-inpanels.1.2 Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity orload transfer c
4、apability between adjacent sections of the ceiling grid. The test methods included in this specification do not providethe means for making a complete evaluation of continuous beam systems, nor for assessing the continuity contribution to overallsystem performance. However, the test methods can be u
5、sed for evaluating primary structural members in conjunction withsecondary members that interlock, as well as with those of noninterlocking type.1.3 While this specification is applicable to the exterior installation of metal suspension systems, the atmospheric conditions andwind loading require add
6、itional design attention to ensure safe implementation. For that reason, a specific review and approvalshould be solicited from the responsible architect and engineer, or both, for any exterior application of metal suspension systemsin the construction of a new building or building modification.1.4
7、The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with t
8、he standard.1.5 The following safety hazards caveat pertains only to the test methods described in this specification. This standard does notpurport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard toestablish appropriate s
9、afety and health practices and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD1735 Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus3. Terminology3.1 Defini
10、tions:3.1.1 Where these terms appear in this specification they shall have the meaning herein indicated as follows:3.1.1.1 backing board a flat sheet of gypsum board to which acoustical tile is attached using adhesive, screws, staples, or othersuitable means (Fig. 1c).3.1.1.2 bowthe maximum componen
11、t of deviation in the vertical plane of a main runner, cross runner, or wall molding wherethe centroidal axis of these structural components has been permanently deformed from end to end into the shape of a simpleregular curve during the manufacturing process (Fig. 2).1 This specification is under t
12、he jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.04on Application of Acoustical Materials and Systems.Current edition approved Oct. 1, 2007Oct. 15, 2012. Published October 2007November 2012. Originally approved in 1969
13、. Last previous edition approved in 20042007as C635 04.C635 07. DOI: 10.1520/C0635_C0635M-07.10.1520/C0635_C0635M-12.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer
14、to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all chang
15、es accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Uni
16、ted States1NOTE 1The meanings for bow and camber given here may differ from those applied elsewhere.3.1.1.3 camberthe maximum component of deviation in the horizontal plane of a main runner, cross runner, or wall moldingwhere the centroidal axis of these structural components has been permanently de
17、formed from end to end into the shape of a simpleregular curve during the manufacturing process (Fig. 2).3.1.1.4 carrying channel or hanging channelthe three-sided or “”-shaped metal sections that support the entire structural gridnetwork in some forms of mechanical ceiling suspension systems (Fig.
18、1b). The carrying channels are usually suspended by hangerwires from the existing structure and the main runners are then attached to the channels.3.1.1.5 ceiling suspension systemthe entire network or grid of structural components, as defined by the ceiling suspensionsystem manufacturer, that provi
19、des support for acoustical ceiling tile, acoustical ceiling panels, lighting fixtures, and air diffusers.FIG. 1 Three Types of Ceiling Suspension Systems Showing All ComponentsC635/C635M 1223.1.1.6 cross runner the secondary or cross beams of a mechanical ceiling suspension system (Fig. 1, a and b).
20、 The crossrunners usually support only the acoustical tile. In some forms of suspension systems, however, the cross runners also providesupport for lighting fixtures, air diffusers, and other cross runners.3.1.1.7 hanger wire the wire employed to suspend the acoustical ceiling from the existing stru
21、cture (wood joists, steel barjoists, steel beams, concrete slabs, etc.) (Fig. 1).3.1.1.8 horizontal plane (of a structural component of a ceiling suspension system)a plane parallel to the plane of the ceilingwhich passes through the centroidal axis of the member (Fig. 2).3.1.1.9 interlockinga ceilin
22、g system where the cross runners are connected to the main runner or other cross runners, or both,at intervals controlled by slots, holes, etc. in the main runners.3.1.1.10 main runner the primary or main beams of the type of ceiling suspension system in which the structural membersare mechanically
23、locked together (Fig. 1, a and b). The main runners provide direct support for cross runners, and may supportlighting fixtures and air diffusers. In addition, the acoustical tile may also be directly supported by the main runners. In some formsof mechanical ceiling suspension systems, the main runne
24、rs are supported by hanger wires attached directly to the existingstructure. In other forms, the main runners (also referred to as “H” runners, “Z” bars, etc.) are installed perpendicular to carryingchannels and are supported by specially designed sheet metal or wire clips attached to the carrying c
25、hannels.3.1.1.11 nailing bar or furring barthe continuous sheet metal strips to which a backing board is attached using either nailsor screws (Fig. 1c). The nailing bars are installed perpendicular to and supported by the carrying channels.3.1.1.12 non-interlockinga ceiling system that does not comp
26、ly with the specifications stated in the definition of interlocking.3.1.1.13 splinea strip of metal or fiber inserted in the kerfs of adjacent acoustical tile to form a concealed mechanical jointseal (Fig. 1b).3.1.1.14 twistthe angle of rotation measured in a transverse plane between the two end cro
27、ss sections of a main runner, crossrunner, or wall molding which has been permanently deformed during the process of manufacturing (Fig. 2).3.1.1.15 vertical plane (of a structural component of a ceiling suspension system)a plane perpendicular to the plane of theceiling which passes through the cent
28、roidal axis of the member (Fig. 2).3.1.1.16 wall molding the edge angles or channels of a mechanical ceiling suspension system that are attached to a wall (Fig.1, a and b). The wall molding provides support for the acoustical tile, main runners and cross runners that are located at theperiphery of t
29、he ceiling.FIG. 2 Diagrams Showing Camber, Bow, and TwistC635/C635M 1234. Classification4.1 The structural performance required from a ceiling suspension system shall be defined by the specifying authority in termsof a suspension system structural classification.4.1.1 The structural classification o
30、f ceiling suspension systems shall be based on the load-carrying capacity of the main runnersof the structural network. Load-carrying capacity as used herein is based on the more stringent requirement of esthetic acceptancerather than the less confining prevention of structural failure. The criterio
31、n is the arbitrary but widely established limit of deflectionto 1360 of the span between supports.4.1.2 The load-carrying capacity shall be the maximum uniformly distributed load (pounds per linear foot N/m) that a simplysupported main runner section having a span length of 4 ft, 0 in. 1200 mm is ca
32、pable of supporting without the mid-spandeflection exceeding 0.133 in. 3.33 mm or 1360 of the 4 ft, 0 in. 1200 mm span length, as tested in accordance with the methoddescribed in Section 8.4.1.3 The structural classification or grade of ceiling suspension systems shall be determined by the capabilit
33、y of main runnersor nailing bars to support a uniformly distributed load. These classifications shall be:4.1.3.1 Light-Duty Systems, used where ceiling loads other than acoustical tile or lay-in panels are not anticipated, such asresidential and light commercial structures.4.1.3.2 Intermediate-Duty
34、Systems, used where ceiling loads other than acoustical tile or lay-in panels (light fixtures, airdiffusers, etc.) are anticipated, such as ordinary commercial structures.4.1.3.3 Heavy-Duty Systems, used where the quantities and weights of ceiling fixtures (lights, air diffusers, etc.) are greater t
35、hanthose for an ordinary commercial structure.4.1.4 For the purpose of determining the structural classification of main runner members as covered in 4.1.2, their simple-span,minimum load-carrying capabilities, when tested in accordance with the test method described in Section 10, shall be listed a
36、sshown in Table 1 and Table 2.4.2 Cross runners shall be capable of carrying the load specified by the manufacturer without exceeding the maximum allowabledeflection equal to 1360 of its span.FIG. 3 Load-Carrying Test Configuration for Inch/Pound UnitsFIG. 4 Load-Carrying Test Configuration for Inch
37、/Pound UnitsC635/C635M 1244.3 The design and definition of the suspension system shall be the responsibility of the manufacturer. Included is selection ofappropriate materials, metal thicknesses, dimensions of necessary component section configurations, design of special hanger andassembly devices,
38、and provision for whatever accessory items are needed to ensure satisfactory ceiling performance within thescope of this specification.4.3.1 System manufacturers may provide supplementary data describing load deflection capabilities of main runners in eachclassification for spans other than 4 ft 120
39、0 mm.4.4 Where specialized loading conditions that are outside the scope of this specification exist, the manufacturer should beconsulted for his recommendations; and, he may furnish engineering data as required. Specification or design of superstructureanchors or fasteners are not the responsibilit
40、y of the ceiling system manufacturer unless specified by the ceiling systemmanufacturer as part of the suspension system.5. Dimensional Tolerance5.1 Suspension system structural members shall conform to the following tolerance requirements:5.1.1 Metal Thickness:5.1.1.1 For steel systems the thicknes
41、s of metal used in main runners, cross runners, wall moldings, splines or nailing bars shallbe stated by the suspension system manufacturer in published literature. The thickness in thousandths of an inch of metal and theallowable thickness variation for the component shall be stated.5.1.1.2 For alu
42、minum systems the thickness of metal used in main runners, cross runners, wall moldings, or splines shall bestated by the suspension system manufacturer in published literature. The thickness in thousandths of an inch of metal and theallowable thickness variation for the component shall be stated.5.
43、1.2 Straightness:5.1.2.1 The amount of bow, camber, or twist in main runners, cross runners, wall molding, splines, or nailing bars of variouslengths shall not exceed the values shown in Table 3.5.1.2.2 Main runners, cross runners, wall moldings, splines, or nailing bars of ceiling suspension system
44、s shall not contain localkinks or bends.5.1.3 Length:TABLE 1 Minimum Load-Carrying Capabilities of Main Runners - Inch/Pound UnitsSuspensionSystemDutyClassificationAppliedLoad (P)EquivalentUniformLoadAllowable MidspanDeflection (d)lb lb/ft in.Direct HungLight 5.0 5.0 0.133Intermediate 12.0 12.0 0.13
45、3Heavy 16.0 16.0 0.133Indirect HungLight 2.0 2.0 0.133Intermediate 3.5 3.5 0.133Heavy 8.0 8.0 0.133Furring BarLight 4.5 4.5 0.133Intermediate 6.5 6.5 0.133Heavy . . .d=span/360TABLE 2 Minimum Load-Carrying Capabilities of Main Runners - SI unitsSuspensionSystemDutyClassificationApplied Load(P)Equiva
46、lentUniformLoadAllowable MidspanDeflection (d)N N/m mm.Direct HungLight 22.7 75.7 3.33Intermediate 54.3 181.0 3.33Heavy 72.5 241.7 3.33Indirect HungLight 9.1 30.3 3.33Intermediate 15.9 53.0 3.33Heavy 36.3 121.0 3.33Furring BarLight 20.4 68.0 3.33Intermediate 29.4 98.0 3.33Heavy . . .d=span/360Equiva
47、lent Uniform Load (n/m) obtained by the following relationship: P/0.3 mC635/C635M 1255.1.3.1 The variation in the specified length of main runner sections or cross runner sections that are part of an interlocking gridsystem shall not exceed 60.010 in./4 ft 0.25 mm/1200 mm.5.1.3.2 The variation in th
48、e specified spacing of slots or other cutouts in the webs of main runners or cross runners that areemployed in assembling a ceiling suspension grid system shall not exceed 60.010 in. 0.25 mm.5.1.4 Over-all Cross-section Dimensions:5.1.4.1 For steel systems, the overall height of the cross section of
49、 main runners, cross runners, wall molding, or nailing bar shallbe the specified dimensions 60.030 in. 0.75 mm. The width of the cross section of exposed main runners or cross runners shallbe the specified dimension 60.008 in. 0.20 mm.5.1.4.2 For aluminum systems, the overall height of the cross section and the allowable variation of main runners, cross runners,or wall molding shall be stated by the suspension system manufacturer in published literature and price lists. The width andallowable variation of the cross section of exposed
