ASTM D5516 - 09

    Standard Test Method for Evaluating the Flexural Properties of Fire-Retardant Treated Softwood Plywood Exposed to Elevated Temperatures

    Active Standard ASTM D5516 | Developed by Subcommittee: D07.07

    Book of Standards Volume: 04.10


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    ASTM D5516

    Significance and Use

    The flexural properties evaluated by this test method are intended to provide any one or all of the following:

    Data on the comparative effects of fire-retardant chemical formulations and environmental conditions on the flexural properties of plywood.

    Data for use in developing modification factors for the allowable design properties of treated plywood when exposed to elevated temperatures and humidities.

    Data comparing variables, such as other plywood species and dimensions.

    Results obtained from tests conducted and analyzed in accordance with the procedures of this test method may be used with other information to establish recommended roof sheathing spans for fire-retardant treated plywood.

    Note 1—Temperatures lower than the test temperature specified in this test method and the cumulative effects of the elevated temperatures and humidity exposures expected to be encountered in service should be taken into account when recommended roof sheathing spans are established.

    1. Scope

    1.1 This test method is designed to determine the effect of exposure to high temperatures and humidities on the flexure properties of fire-retardant treated softwood plywood. In this test method, plywood is exposed to a temperature of 77°C (170°F).

    1.2 The purpose of the test method is to compare the flexural properties of fire-retardant treated plywood relative to untreated plywood. The results of tests conducted in accordance with this test method provide a reference point for estimating strength temperature relationships. This test method is intended to provide an accelerated test at elevated temperatures and controlled humidities of plywood sheathing treated with the same chemical formulation(s) and processing conditions as plywood used commercially.

    1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D9 Terminology Relating to Wood and Wood-Based Products

    D1165 Nomenclature of Commercial Hardwoods and Softwoods

    D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products

    D3043 Test Methods for Structural Panels in Flexure

    D6305 Practice for Calculating Bending Strength Design Adjustment Factors for Fire-Retardant-Treated Plywood Roof Sheathing

    E84 Test Method for Surface Burning Characteristics of Building Materials

    E176 Terminology of Fire Standards

    Other Standards

    PS2 U.S. Product Standard for Wood-Based Structural Use Panels


    ICS Code

    ICS Number Code 79.060.20 (Fibre and particle boards)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D5516-09

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