1.1 本试验方法包括测量卷曲或未卷曲纤维束在某些环境下（例如沸水15分钟）的无限制收缩。 1.1.1 本试验方法可用于从丝束中提取的纤维以及从纺纱或连续长丝中提取的纤维。 注1: 有关单纤维收缩率的测量，请参阅测试方法 D5104 . 1.2 以英寸-磅或国际单位制表示的数值应单独视为标准。每个系统中规定的值不是精确的等效值，因此，每个系统必须独立于其他系统使用。 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====== 5.1 测量长度变化的精度有限，导致收缩率低于10的估计值存在误差 %. 然而，该试验用于低收缩纤维，因为结果表明在较低水平下的平均收缩率足够。该试验不足以确定低水平下平均收缩率的可变性。如果两个实验室（或更多实验室）的报告测试结果之间存在实际意义上的差异，则应进行比较测试，以确定它们之间是否存在统计偏差，并使用适当的统计协助。作为最低要求，使用尽可能同质的样品进行比较试验，从与初始试验期间产生不同结果的样品相同批次的材料中提取，并随机等份分配给每个实验室。应使用未配对数据的统计测试对相关实验室的测试结果进行比较，这是在测试系列之前选择的概率水平。 如果发现偏差，必须找到并纠正其原因，或者考虑到已知偏差，必须调整该材料的未来测试结果。 5.2 这种测试纤维收缩率的测试方法不建议用于纤维商业运输的验收测试，因为可用数据量有限。参见第节 14 . 5.3 本试验方法可用于纤维商业运输的验收试验；但由于实验室间精度的信息不完整，建议谨慎。按照中的指示进行比较测试 5.1 建议。

1.1 This test method covers the measurement of the unrestrained shrinkage of a bundle of crimped or uncrimped fibers from exposure to some environment, for instance, boiling water for 15 min. 1.1.1 This test method may be used on fibers from tow and fibers removed from spun or continuous filament yarn. Note 1: For measurement of shrinkage of single fibers, refer to Test Method D5104 . 1.2 The values stated in either inch-pound or SI units are to be regarded separately as the standard. The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other. 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 Limited accuracy in measuring the change in length produces errors in estimating values for shrinkage below 10 %. However, this test is being used for low level shrinkage fibers because the results give have been found to give an adequate indication of average shrinkage at the lower levels. The test is not adequate for determining variability in average shrinkage at low levels. If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias. 5.2 This test method for testing the shrinkage of fibers is not recommended for acceptance testing of commercial shipments of fibers because only a limited amount of data is available. See Section 14 . 5.3 This test method may be used for acceptance testing of commercial shipments of fibers; but caution is advised since information on between laboratory precision is incomplete. Comparative tests as directed in 5.1 are advised.