1.1 本规程涵盖用于测定抗弯性的柔性屏障材料的调节。可以进行后续测试，以确定弯曲对材料性能的影响。这些测试超出了本规程的范围。 1.2 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 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）。本标准的使用者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 这种做法在确定柔性包装材料对弯曲形成的针孔的抵抗力方面是有价值的。通常使用调节级别A、B或C。参考做法 E171 和指南 F2097 。 5.2 条件D和E通常用于确定弯曲对屏障性能和与气体和/或湿气相关的传输速率的影响。 5.3 本规程不测量或调节与弯曲失效相关的磨损材料。 5.4 多层结构的一个或多个层的完整性故障可能需要替代测试。使用气体或水蒸气的补充渗透测试可以与挠曲调节结合使用，以测量帘布层完整性的损失。弯曲后可以使用其他测试方法来评估针孔的存在。有关测试方法的列表，请参阅指南 F2097 。 图1 Gelbo轴螺旋槽30.70的平面演变 毫米[1.20 in.]直径轴 5.4.1 本实践中描述的各种条件是为了防止评估材料结构，结果是孔太多而无法有效计数（通常大于50个），或孔太少而无法显著计数（通常每个样品少于5个）。 在选择测试条件水平时，应考虑材料结构、测试基础以及与指定目标的相互协议。

1.1 This practice covers conditioning of flexible barrier materials for the determination of flex resistance. Subsequent testing can be performed to determine the effects of flexing on material properties. These tests are beyond the scope of this practice. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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 ====== 5.1 This practice is valuable in determining the resistance of flexible packaging materials to flex-formed pinholes. Conditioning levels A, B, or C are typically used. Reference Practice E171 and Guide F2097 . 5.2 Conditions D and E are typically used for determining the effect of flexing on barrier properties and transmission rates related to gas and/or moisture. 5.3 This practice does not measure or condition materials for abrasion related to flex failure. 5.4 Failures in the integrity of one or more of the plies of a multi-ply structure may require alternative testing. Supplementary permeation testing using gas or water vapor can be used in conjunction with the flex conditioning to measure the loss of ply integrity. Other test methods may be used after flexing for assessment of presence of pinholes. For a list of test methods, refer to Guide F2097 . FIG. 1 Planar Evolution of Gelbo Shaft Helical Groove 30.70 mm [1.20 in.] Diameter Shaft 5.4.1 The various conditions described in this practice are to prevent evaluating a material structure with an outcome of too many holes to effectively count (normally greater than 50), or too few to be significant (normally less than five per sample). Material structure, testing basis, and a mutual agreement with specified objectives are to be considered in the selection of conditioning level for testing.