1.1 本试验方法旨在确定暴露于高温和湿度下对阻燃处理软木胶合板弯曲性能的影响。在本试验方法中，胶合板暴露在77°C（170°F）的温度下。 1.2 试验方法的目的是比较阻燃处理胶合板与未处理胶合板的弯曲性能。根据本试验方法进行的试验结果为估计强度-温度关系提供了参考点。本试验方法旨在提供使用与商用胶合板相同的化学配方和加工条件处理的胶合板护套在高温和受控湿度下的加速试验。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 通过本试验方法评估的弯曲性能旨在提供以下任何一项或全部: 5.1.1 阻燃剂化学配方和环境条件对胶合板弯曲性能的比较影响数据。 5.1.2 当暴露在高温和湿度下时，用于制定经处理胶合板的允许设计性能修改系数的数据。 5.1.3 比较变量的数据，如其他胶合板种类和尺寸。 5.2 根据本试验方法的程序进行和分析的试验结果适用于与其他信息一起使用，以确定建议的防火屋面板跨度- 阻燃处理胶合板。 注1: 当确定推荐的屋面板跨度时，应考虑低于本试验方法中规定的试验温度的温度以及预期在使用中遇到的高温和湿度暴露的累积影响。 注2: 实践 D6305 可用于将通过本试验方法获得的实验室强度数据扩展至设计值建议。通过本试验方法确定的试验数据用于制定适用于未处理胶合板设计值的阻燃处理调整系数。测试数据与气候模型和其他因素结合使用。

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The flexural properties evaluated by this test method are intended to provide any one or all of the following: 5.1.1 Data on the comparative effects of fire-retardant chemical formulations and environmental conditions on the flexural properties of plywood. 5.1.2 Data for use in developing modification factors for the allowable design properties of treated plywood when exposed to elevated temperatures and humidities. 5.1.3 Data comparing variables, such as other plywood species and dimensions. 5.2 Results obtained from tests conducted and analyzed in accordance with the procedures of this test method are suitable for use 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. Note 2: Practice D6305 can be used to extend the laboratory strength data obtained by this test method to design value recommendations. The test data determined by this test method are used to develop adjustment factors for fire-retardant treatments to apply to untreated plywood design values. The test data are used in conjunction with climate models and other factors.