1.1 本试验方法包括使用恒定拉伸速率（CRE）型拉伸试验机测定由天然橡胶、氨纶或其他弹性体制成的“生产”弹性纱线的拉伸性能。本试验方法中包括的特性为:( 1. )第一次灯丝断裂时的力( 2. )第一次断丝时的韧性( 3. )第一次断丝时的伸长率( 4. )第一次灯丝断裂时的断裂工作，以及( 5. )第一次断丝时的韧性。 1.2 本试验方法不适用于覆盖、包裹或核心- 纺纱或由弹性短纤维纺成的纱线。 1.3 本试验方法适用于40至3200 dtex（36至2900旦）范围内的弹性纱线。 1.4 以国际单位制或美国惯用单位表示的数值应单独视为标准。在文本中，括号中给出了美国惯用单位。每个系统中规定的值不是精确的等价物；因此，每个系统应相互独立使用。 1.5 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。 1.6 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 由于实验室间精度的当前估计值是可接受的，并且该方法在验收测试行业中广泛使用，因此该测试方法被认为适用于商业装运的验收测试。 5.1.1 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，在测试系列之前选择的概率水平上，对相关实验室的测试结果进行比较。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 弹性纱线第一次断丝时的力可能取决于其结构和制造工艺，并指示由纱线制成的织物的断裂强度。 5.3 伸长率表示纤维吸收能量的能力。纱线或织物的伸长率必须足够大，以承受加工和最终使用过程中产生的应变，并吸收反复施加的力的能量。 5.4 织物制造商在确定机组时使用弹性纱线的力和伸长率信息- up条件。 5.5 其他参数，如规定力下的伸长率（EASF）、规定伸长率下的力（或韧性）（FASE、TASE）、功和韧性，可根据力-伸长率曲线计算。在测定弹性性能时，涉及纱线循环的测试需要EASF和FASE信息。 5.6 本试验方法是在“生产”状态下使用弹性纱线开发的，但如果规定了处理方法，则可用于处理过的弹性纱线。该方法不包括测定“饰面”拉伸性能时去除饰面- 自由“弹性纱线。

1.1 This test method covers the determination of the tensile properties of “as produced” elastomeric yarns made from natural rubber, spandex or other elastomers, using a constant-rate-of-extension (CRE) type tensile testing machine. The properties included in this test method are: ( 1 ) force at first filament break, ( 2 ) tenacity at first filament break, ( 3 ) elongation at first filament break, ( 4 ) work to break at first filament break, and ( 5 ) toughness at first filament break. 1.2 This test method does not apply to covered, wrapped, or core-spun yarns or yarns spun from elastomeric staple. 1.3 This test method is applicable to elastomeric yarns in the range from 40 to 3200 dtex (36 to 2900 denier). 1.4 The values stated in either SI units or U.S. Customary units are to be regarded separately as standard. Within the text, the U.S. Customary units are given in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. 1.5 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. 1.6 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 test method is considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing. 5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use samples for such 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, at a probability level chosen prior to the testing series. If 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 The force at first filament break of elastomeric yarns may depend on its construction and manufacturing process and provides an indication of the breaking strength of fabrics made from the yarn. 5.3 Elongation is an indication of the ability of a fiber to absorb energy. The elongation of yarn or fabric must be great enough to withstand strains experienced in processing and end use, and to absorb the energies of applied forces repeatedly. 5.4 Fabric manufacturers use force and elongation information of elastomeric yarns in determining machine set-up conditions. 5.5 Other parameters such as elongation at specified force (EASF), force (or tenacity) at specified elongation (FASE, TASE), work and toughness may be calculated from force-elongation curves. EASF and FASE information is needed for tests involving cycling of yarn in determination of elastic properties. 5.6 This test method was developed using elastomeric yarns in the “as-produced” condition, but may be used for treated elastomeric yarns provided the treatment is specified. The method does not cover the removal of finish for determination of tensile properties of “finish-free” elastomeric yarns.