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Designation: D5516 − 26Standard 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international 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.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 FlexureD4933 Guide for Moisture Conditioning of Wood andWood-Based MaterialsD6305 Practice for Calculating Bending Strength DesignAdjustment Factors for Fire-Retardant-Treated PlywoodRoof SheathingE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE176 Terminology of Fire StandardsE2768 Test Method for Extended Duration Surface BurningCharacteristics of Building Materials (30 min Tunnel Test)2.2 Other Standards:AWPA C-27 Plywood-Fire Retardant Treatment by PressureProcesses 3AWPA U1 Use Category System: User Specif i cation forTreated Wood 3NFPA 703 Standard for Fire Retardant Impregnated Woodand Fire Retardant Coatings for Building Materials 41 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 Jan. 15, 2026. Published January 2026. Originallyapproved in 1991 as ES 20 – 91. Last previous edition approved in 2018 asD5516 – 18. DOI: 10.1520/D5516-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.3 Available from American Wood Protection Association (AWPA), 2430 U.S.Highway 27, Suite 330-223, Clermont, FL 34714, http://www.awpa.com.4 Available from National Fire Protection Association (NFPA), 1 BatterymarchPark, Quincy, MA 02169-7471, http://www.nfpa.org.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1