1.1 本规程涵盖了塑料薄膜试样的测试集的制备，以供随后在实验室间循环研究中使用，从而评估测试方法的精度。 1.2 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。 注1: 目前还没有与该标准等效的ISO。 1.3 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====== 4.1 这种做法旨在协助参与循环研究的工作组从芯上的卷形式的薄膜样品中制备薄膜样品的测试集。 4.2 本规程假设循环协议的基本特征已经按照规程的指导建立 E691 特别地，假设以下是已知的:( 1. )要使用的薄膜样品的数量( 2. )参与实验室的数量( 3. )每个实验室为每个样本生成的重复测试结果的数量，以及( 4. )每个样品产生一个测试结果所需的试样数量。 4.3 根据这一实践，样本被划分为测试集，以便在- 样本变异性不会过度扭曲对循环研究中产生的数据进行统计分析得出的结论。

1.1 This practice covers the preparation of test sets of plastic film specimens for subsequent use in an interlaboratory round-robin study to evaluate the precision of a test method. 1.2 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. Note 1: There is no known ISO equivalent to this standard. 1.3 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 This practice is intended to assist task groups participating in a round-robin study with the preparation of test sets of film specimens from film samples in the form of rolls on a core. 4.2 This practice assumes that the essential features of the round-robin protocol have already been established by following the guidance of Practice E691 . In particular, it is assumed that the following are known: ( 1 ) the number of film samples to be used, ( 2 ) the number of participating laboratories, ( 3 ) the number of replicate test results to be generated by each laboratory for each sample, and ( 4 ) the number of test specimens required to yield one test result for each sample. 4.3 In accordance with this practice, samples are partitioned into test sets so that real within-sample variability will not unduly distort the conclusions drawn from statistical analyses of the data generated in the round-robin study.