1.1 本规程规定了纸张和纸制品、纸板、纤维板和由其制成的容器的正常预处理、调节和测试的标准大气。它还规定了处理这些材料的程序，以使其与各自的大气达到平衡。 1.2 这种做法不包括特殊的调节和测试大气，例如那些试图模拟热带或北极环境的大气。 1.3 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。 1.4 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====== 3.1 预处理要求很重要，因为50℃下样品的物理性质 % 相对湿度取决于样品是否达到50 % 从较高或较低的相对湿度。有关预处理重要性的详细讨论，请参见 附件A1 . 3.2 调节和测试环境很重要，因为温度和相对湿度对纸和纸板的物理性能有显著影响。有关重要性的更详细讨论，请参见 附件A2 . 3.3 本标准在技术上与TAPPI T402相同。

1.1 This practice defines the standard atmospheres for normal preconditioning, conditioning, and testing of paper and paper products, paperboard, fiberboard, and containers made from them. It also specifies procedures for handling these materials in order that they may reach equilibrium with the respective atmosphere. 1.2 This practice does not include special conditioning and testing atmospheres, such as those that attempt to simulate tropical or arctic environments. 1.3 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. 1.4 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 ====== 3.1 The preconditioning requirement is important because physical properties of a sample at 50 % relative humidity depend upon whether the sample is brought to 50 % from a higher or lower relative humidity. A detailed discussion of the importance of preconditioning may be found in Annex A1 . 3.2 The conditioning and testing atmospheres are important because both temperature and relative humidity have significant effects on the physical properties of paper and board. A more detailed discussion of the importance may be found in Annex A2 . 3.3 This standard is technically identical to TAPPI T402.