1.1本指南涵盖了塑料膜厚度的测定，其中厚度直接用于测定各种性能的试验结果。除非材料规范或适用测试标准另有要求，否则使用本规程。 注1 — 电影是用术语定义的 D883 作为标称厚度不大于0.25 mm（0.010 in）的薄板的可选术语。 注释2 — 如果替代方法满足本指南中规定的测量精度要求，则可以接受。 附注3 — 本指南并非针对商业产品商业分类或质量控制目的的取样技术或膜厚度测量。 1.2以国际单位制表示的数值应视为标准。 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和健康实践，并确定监管要求的适用性。 附注4 — 本标准和ISO 4593涉及相同的主题，但技术内容不同。 ====意义和用途====== 5.1本指南旨在提供在计算以物理单位表示的特性时确定精确尺寸的建议和建议的良好做法。其目的不是取代基于商用便携式工具的实际厚度测量，也不意味着通过程序进行的厚度测量将完全一致。

1.1 This guide covers the determination of the thickness of plastic films where the thickness is used directly in determining the results of tests for various properties. Use this practice except as otherwise required in material specifications or in applicable test standards. Note 1 — Film is defined in Terminology D883 as an optional term for sheeting having a nominal thickness no greater than 0.25 mm (0.010 in). Note 2 — Alternative methods are acceptable if they meet the requirements of measurement precision as noted in this guide. Note 3 — This guide is not intended to address the sampling techniques or the measurement of film thickness for the commercial classification of commercial products or for quality control purposes. 1.2 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory requirements prior to use. Note 4 — This standard and ISO 4593 address the same subject matter but differ in technical content. ====== Significance And Use ====== 5.1 This guide is intended to provide recommendations and suggested good practices to determine precise dimensions when necessary for the calculation of properties expressed in physical units. It is not intended to replace practical thickness measurements based on commercial portable tools, nor is it implied that thickness measurements made by the procedures will agree exactly.