1.1 本试验方法设计为实验室筛选试验。其目的是了解许多木材、阻燃剂、树脂和加工变量及其相互作用对阻燃垫成型木结构复合材料（FRSC）面板的机械性能的各自贡献，因为它们会影响弯曲和内部粘结（IB）性能，并且在高温和高湿暴露期间经常受到影响。一旦通过这些小样本实验室筛选试验确定了关键材料和加工变量，就需要进行额外的测试和评估，以确定处理对面板结构性能的影响以及高温暴露对商业生产的FRSC面板性能的影响。 在该试验方法中，处理过的结构复合板暴露在77°C（170°F）的温度和至少50%的相对湿度下。 1.2 基于实验室的初步测试方法的目的是比较FRSC面板相对于未经处理的结构复合面板的弯曲性能和IB强度，这些面板具有相同的制造参数。根据本试验方法进行的试验结果为初步估算强度-温度关系提供了参考点。它们为随后对商业生产的FRSC面板进行全面测试奠定了基础。 1.3 本试验方法不包括产品认证和资格认证或FRSC面板设计值调整系数建立所需的测试和评估要求。 注1: 这种初步筛查测试方法的一个潜在的混淆限制是，它可能使用不一定代表商业质量的实验室面板进行。最终的资格认证程序可能应使用商业质量的面板进行，审查范围应包括评估处理和高温暴露对商业生产面板所有相关机械性能的影响。 1.4 本试验方法不适用于结构胶合板。 1.5 以国际单位制表示的值应被视为标准值。括号中给出的值是英寸的数学转换- 磅单位仅供参考，不被视为标准单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 通过本试验方法评估的性能旨在提供阻燃化学配方和环境条件对FRSC面板弯曲性能和IB强度影响的比较信息。 5.2 该试验方法使用受控的高温环境，在FRSC面板和未处理面板的机械性能中产生温度引起的损失。 5.3 自然环境中的性能预测与该测试方法的结果没有直接相关性。 5.4 高温暴露结果的再现性在很大程度上取决于所测试的试样类型、所选的评估标准以及操作变量的控制。 在任何测试程序中，应包括足够的重复，以确定结果的可变性。当在不同的试验室中测试类似的试样时，即使测试条件名义上相似并且在本试验方法规定的范围内，也经常观察到可变性。

1.1 This test method is designed as a laboratory screening test. It is intended to establish an understanding of the respective contributions of the many wood material, fire-retardant, resin and processing variables, and their interactions, upon the mechanical properties of fire-retarded mat-formed wood structural composite (FRSC) panels as they affect flexural and internal bond (IB) performance and as they are often affected later during exposure to high temperature and humidity. Once the critical material and processing variables have been identified through these small-specimen laboratory screening tests, additional testing and evaluation shall be required to determine the effect of the treatment on the panel structural properties and the effect of exposure to high temperature on the properties of commercially produced FRSC panels. In this test method, treated structural composite panels are exposed to a temperature of 77 °C (170 °F) and at least 50 % relative humidity. 1.2 The purpose of the preliminary laboratory-based test method is to compare the flexural properties and IB strength of FRSC panels relative to untreated structural composite panels with otherwise identical manufacturing parameters. The results of tests conducted in accordance with this test method provide a reference point for estimating strength temperature relationships for preliminary purposes. They establish a starting point for subsequent full-scale testing of commercially produced FRSC panels. 1.3 This test method does not cover testing and evaluation requirements necessary for product certification and qualification or the establishment of design value adjustment factors for FRSC panels. Note 1: One potentially confounding limitation of this preliminary screening test method is that it may be conducted with laboratory panels that may not necessarily represent commercial quality panels. A final qualification program should likely be conducted using commercial quality panels and the scope of the review should include evaluation of the effects of the treatment and elevated temperature exposure on all relevant mechanical properties of the commercially produced panel. 1.4 This test method is not intended for use with structural plywood. 1.5 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. 1.6 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. 1.7 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 properties evaluated by this test method are intended to provide comparative information on the effects of fire-retardant chemical formulations and environmental conditions on the flexural properties and IB strength of FRSC panels. 5.2 This test method uses a controlled elevated-temperature environment to produce temperature-induced losses in the mechanical properties of FRSC panels and untreated panels. 5.3 Prediction of performance in natural environments has not been directly correlated with the results of this test method. 5.4 The reproducibility of results in elevated-temperature exposure is highly dependent on the type of specimens tested and the evaluation criteria selected, as well as the control of the operating variables. In any testing program, sufficient replicates shall be included to establish the variability of the results. Variability is often observed when similar specimens are tested in different chambers even though the testing conditions are nominally similar and within the ranges specified in this test method.