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Designation: D5516 − 09Standard Test Method forEvaluating the Flexural Properties of Fire-Retardant TreatedSoftwood Plywood Exposed to Elevated Temperatures 1This standard is issued under the f i xed designation D5516; 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 test method is designed to determine the effect ofexposure to high temperatures and humidities on the f l exureproperties of f i re-retardant treated softwood plywood. In thistest method, plywood is exposed to a temperature of 77°C(170°F).1.2 The purpose of the test method is to compare thef l exural properties of f i re-retardant treated plywood relative tountreated plywood. The results of tests conducted in accor-dance with this test method provide a reference point forestimating strength temperature relationships. This test methodis intended to provide an accelerated test at elevated tempera-tures and controlled humidities of plywood sheathing treatedwith the same chemical formulation(s) and processing condi-tions as plywood used commercially.1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.4 This standard 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards: 2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD1165 Nomenclature of Commercial Hardwoods and Soft-woodsD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD3043 Test Methods for Structural Panels in FlexureD6305 Practice for Calculating Bending Strength DesignAdjustment Factors for Fire-Retardant-Treated PlywoodRoof SheathingE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE176 Terminology of Fire Standards2.2 Other Standards:AWPA C-27 Plywood-Fire Retardant Treatment by PressureProcesses 3NFPA 703 Standard for Fire Retardant Impregnated Woodand Fire Retardant Coatings for Building Materials 4PS 1 U.S. Product Standard for Structural Plywood 5PS 2 U.S. Product Standard for Wood-Based Structural UsePanels 53. Terminology3.1 Def i nitions—Def i nitions used in this test method are inaccordance with Terminologies D9 and E176 and Nomencla-ture D1165.3.2 Def i nitions of Terms Specif i c to This Standard:3.2.1 depth of beam—that dimension of the beam which isperpendicular to the span and parallel to the direction in whichthe load is applied.3.2.2 span—the total distance between the centerline ofsupports providing the reactions on which a beam is supportedto accommodate a transverse load.3.2.3 span-depth ratio—the numerical ratio of span dividedby beam depth.1 This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.07 on Fire Performance ofWood.Current edition approved May 15, 2009. Published June 2009. Originallyapproved in 1991 as ES 20 – 91. Last previous edition approved in 2003 asD5516 – 03. DOI: 10.1520/D5516-09.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.3 Available from American Wood Protection Association (AWPA), P.O. Box361784, Birmingham, AL 35236-1784, http://www.awpa.com.4 Available from National Fire Protection Association (NFPA), 1 BatterymarchPark, Quincy, MA 02169-7471, http://www.nfpa.org.5 Available from the U.S. Department of Commerce, 1401 Constitution Ave.,NW Washington, DC 20230, http://ts.nist.gov/Standards/Conformity/vps.cfm.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1