ASTM C635/C635M-17 pdf free download.Standard Specification for Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and L ay-in Panel Ceilings.
1.1 This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-in panels.
1 .2 Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity or load transfer capability between adjacent sections of the ceiling grid. The test methods of Test Methods E30901E3090M referenced in this specification do not provide the means for making a complete evaluation of continuous beam systems, nor for assessing the continuity contribution to overall system performance. However, the test methods can be used for evaluating primary structural members in conjunction with secondary 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 and wind loading require additional design attention to ensure safe implementation. For that reason, a specific review and approval should be solicited from the responsible architect and engineer, or both, for any exterior application of metal suspension systems in the construction of a new building or building modification.
1 .4 The values stated in either SI units or inch-pound units are to he regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
3. Terminology
3.1 Where these terms appear in this specification they shall have the meaning herein indicated as follows:
3.2 Definitions:
3.2.1 hacking hoard, n—a flat sheet of gypsum hoard to which acoustical tile is attached using adhesive, screws, staples. or other suitable means (Fig. 1c).
3.2.2 ho u—the maximum component of deviation in the vertical plane of a main runner, cross runner, or wall molding where the centroidal axis of these structural components has been permanently deformed from end to end into the shape of a simple regular curve during the manufacturing process (Fig.2).
3.2.2. 1 Discussion—The meanings for bow and camber given here may differ from those applied elsewhere.
3.2.3 camber, n—the maximum component of deviation in the horizontal plane of a main runner, cross runner, or wall molding where the centroidal axis of these structural components has been permanently deformed from end to end into the shape of a simple regular curve during the manufacturing process (Fig. 2).ASTM C635/C635M pdf download.