1.1 本试验方法包括在类似于拉链纵梁家用洗涤的条件下，测定色度变化和染色。本试验方法适用于使用棉、亚麻或人造有机纤维制成的胶带的拉链纵梁的纺织部分及其组合。 1.2 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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 试验方法 D2057 有助于测试，以确定阴影的变化程度是否符合预期的最终用途，并确定相邻织物是否会出现不可接受的染色。 注1: 有关评估该方法结果的指导，请参阅实践 D3692 . 5.2 该测试方法被认为是商业货物验收测试的满意方法，因为该方法已在验收测试行业中广泛使用。 5.2.1 如果两个实验室（或更多实验室）报告的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，并使用适当的统计辅助。至少，应使用尽可能均匀的测试样品，从获得不同测试结果的材料中提取，并以相同数量随机分配给每个实验室进行测试。具有既定测试值的其他材料可用于此目的。应使用未配对数据的统计测试，在测试系列之前选择的概率水平上，比较两个实验室的测试结果。 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，调整未来的测试结果。 5.3 本标准中的方法以及 D2051 , D2052 , D2053 , D2054 , D2058 , D2059 , D2060 , D2061 和 D2062 是一系列经验证的拉链测试方法。它们可以作为评估拉链的辅助工具，而无需对拉链有透彻的了解。列举的测试方法没有提供对所有拉链性能的评估。除了通过列举试验方法测量的性能外，还有其他性能对拉链的满意性能可能很重要。测量这些性能的测试方法尚未公布，因为尚未开发出实用方法，或者因为对现有未公布方法产生的信息进行有效评估需要对拉链有深入的了解。

1.1 This test method covers the determination of alteration in shade and of staining under conditions similar to that experienced in domestic washing of zipper stringers. This test method is applicable to the textile portion of zipper stringers that utilize tapes made of cotton, linen, or manufactured organic fibers, and to combinations thereof. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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 Test Method D2057 is useful for testing to determine if the degree of alteration in shade is satisfactory for the intended end-use and for determining if unacceptable staining of color into adjacent fabric will occur. Note 1: For guidance in evaluating the results of this method, refer to Practice D3692 . 5.2 This test method is considered satisfactory for acceptance testing of commercial shipments because the method has been used extensively in the trade for acceptance testing. 5.2.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if their is a statistical bias between them, using competent statistical assistance. As a minimum, the test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other materials with established test values may be used for this purpose. The test results from the two laboratories should be compared using a statistical test for unpaired data, at 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 must be adjusted in consideration of the known bias. 5.3 The method(s) in this standard along with those in D2051 , D2052 , D2053 , D2054 , D2058 , D2059 , D2060 , D2061 , and D2062 are a collection of proven zipper test methods. They can be used as aids in the evaluation of zippers without the need for a thorough knowledge of zippers. The enumerated test methods do not provide for the evaluation of all zipper properties. Besides those properties measured by means of the enumerated test methods there are other properties that may be important for the satisfactory performance of a zipper. Test methods for measuring those properties have not been published either because no practical methods have yet been developed or because a valid evaluation of the information resulting from existing unpublished methods requires an intimate and thorough knowledge of zippers.