1.1 本试验方法规定了通过在92±2℃的试验条件下测定阻燃处理木材和木基产品试样的含水量来测定阻燃处理木材制品吸湿性的程序 % 81时的相对湿度 ± 4°F[27±2°C]。 1.2 本试验方法的文本参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本试验方法的要求。 1.3 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，每个系统应相互独立使用。将两个系统的值结合起来可能会导致不符合标准。 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====== 4.1 经阻燃化学品处理的木材和木基产品的吸湿性能通常大于未经处理的产品。在相对湿度较高的情况下尤其如此。这种较高的吸湿性有时是导致染色、腐烂、油漆附着力差以及化学品和水分在高湿度下迁移和渗出的原因。 金属紧固件有时也会发生腐蚀。 4.2 使用该标准获得的结果对于识别具有低吸湿性的处理具有重要意义。 4.3 结果可用于确定特定处理产品的使用暴露限制。 4.4 室内用阻燃处理木材的建筑规范和其他规范包括基于本试验方法的要求。

1.1 This test method prescribes the procedure for determining the hygroscopicity of fire retardant treated wood products by determining the moisture content of fire-retardant-treated wood and wood-based product specimens after exposure to a test condition of 92 ± 2 % relative humidity at 81 ± 4°F [27 ± 2°C]. 1.2 The text of this test method references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this test method. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems has the potential to result in non-conformance with the 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 ====== 4.1 The hygroscopic properties of wood and wood-based products treated with fire-retardant chemicals are often greater than for untreated products. This is particularly true at the higher relative humidity conditions. This higher hygroscopicity sometimes is the cause for staining, decay, poor paint adhesion, and migration and exuding of chemicals and moisture at the high humidities. Corrosion of metal fasteners sometimes also occurs. 4.2 The results obtained with this standard are important in identifying treatments with low hygroscopic properties. 4.3 Results can be useful in determining exposure limitations in service for specific treated products. 4.4 Building codes and other specifications for fire-retardant-treated wood for interior use include requirements based on this test method.