1.1 本规程涵盖了用于切割测试用薄膜和薄片试样的设备和技术。 2. 试样无缺口，无拉伸，可快速制备。 1.2 以国际单位制给出的值应视为标准值。括号中给出的值仅供参考。 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。 注1: 没有已知的ISO等效于本标准。 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====== 3.1 许多测试方法，包括测试方法 D882 , D2838 , F88 , F1921/F1921M 和 F2029 要求使用不同长度的窄带。样品制备的质量直接影响测试结果。本规程描述了三种制备具有直、干净、平行边缘且无可见缺陷的样品的技术。 注2: 切割后，应对每个试样进行目视检查，以确保边缘未受损（无划痕）。应定期通过显微镜检查评估试样边缘质量。为了确定何时需要更换或锐化切割刀片，应提供抗拉强度和断裂伸长率的控制图（见试验方法 D882 )可以保持材料的均匀性。拉伸强度和断裂伸长率将随着试样切割质量的降低而降低。

1.1 This practice covers equipment and techniques for cutting film and sheeting specimens for testing. 2 The specimens are nick-free, non-stretched and can be rapidly prepared. 1.2 The values given in SI units are to be considered standard. The values given in parentheses are for information only. 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. Note 1: There is no known ISO equivalent to this standard. 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 ====== 3.1 Many test methods including Test Methods D882 , D2838 , F88 , F1921/F1921M , and F2029 require the use of narrow strips of varying length. The quality of the sample preparation directly affects test results. This practice describes three techniques for preparing samples with straight, clean, parallel edges with no visible imperfections. Note 2: After cutting, each specimen should be examined visually to insure the edges are undamaged (free of nicks). On a periodic basis specimen edge quality should be evaluated by microscopic examination. To determine when cutting blades need to be replaced or sharpened, a control chart of tensile strength and percent elongation at break (see Test Method D882 ) of a uniform material may be maintained. Tensile strength and percent elongation at break will decrease as the quality of specimen cutting decreases.