1.1 本试验方法包括在规定的试验条件下，塑料薄膜和薄片在自身或其他物质上滑动时的起动摩擦系数和滑动摩擦系数的测定。该程序允许使用具有移动平面的固定滑板，或具有固定平面的移动滑板。对于给定的样品，两种程序产生相同的摩擦系数值。 附注1: 关于部分缠绕在圆筒或绞盘上的塑料薄膜的摩擦特性，见试验方法 G143 由ASTM小组委员会G02.50管辖。 1.2 通过该试验方法获得的试验数据是相关的，适合用于工程设计。 1.2.1 作为该测试的一个选择，在23℃以外的温度下的摩擦系数的测量是通过在滑板处于环境温度下仅加热/冷却平面来进行的。1.3 以SI单位表示的值将被视为标准值。括号中给出的值仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 有关具体的预防声明，请参见 6.5 . 附注2: 该测试方法不等同于ISO 8295-1995，两种方法之间的结果不能直接比较。 1.5 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 4.1 通过使膜或片材在自身上或在另一物质上滑动来测量膜或片材上的摩擦特性。摩擦系数与塑料薄膜的滑动性能有关，这在包装应用中受到广泛关注。这些方法产生用于薄膜生产中控制目的的经验数据。通常可以建立测试结果与实际性能的相关性。 4.1.1 该测试方法包括在23℃以外的温度下通过仅加热平面而在滑板处于环境温度下进行测试。 4.2 滑移性能由一些塑料薄膜(例如聚乙烯)中的添加剂产生。这些添加剂与膜基质具有不同程度的相容性。其中一些开花，或渗出到表面，润滑它，使它更滑。因为这种起霜作用在膜表面的所有区域上并不总是均匀的，所以这些测试的值在再现性方面可能受到限制。 4.3 塑料薄膜和片材的摩擦性能取决于两个表面之间运动速率的均匀性。确保尽可能仔细地控制设备的运动速度。 4.4 通过这些程序获得的一些膜或片材的数据对膜或片材的年龄和表面状况敏感。许多滑爽添加剂的起霜作用是时间依赖性的。由于这个原因，比较在不同时间生产的膜或片材的滑动和摩擦性能有时是没有意义的，除非希望研究这种影响。 4.5 塑料薄膜和薄片的摩擦和滑动性能基于表面现象的测量。如果产品是通过不同的工艺制造的，或者甚至是通过相同的工艺在不同的机器上制造的，它们的表面性质取决于设备或其运行条件。在评估这些方法的数据时，必须权衡这些因素。 4.6 静摩擦系数的测量高度依赖于加载速率和由于运动开始前的时间变化而在加载的滑板和平台之间发生的阻塞量。 4.7 确保不超过记录仪的响应速度，无论是电子的还是机械的。 4.8 某些材料规格要求对该试验方法进行修改。在使用本试验方法之前，应参考材料质量标准。分类系统表1 D4000 列出当前存在的ASTM材料标准。

1.1 This test method covers determination of the coefficients of starting and sliding friction of plastic film and sheeting when sliding over itself or other substances at specified test conditions. The procedure permits the use of a stationary sled with a moving plane, or a moving sled with a stationary plane. Both procedures yield the same coefficients of friction values for a given sample. Note 1: For the frictional characteristics of plastic films partially wrapped around a cylinder, or capstan, see Test Method G143 under the jurisdiction of ASTM Subcommittee G02.50. 1.2 Test data obtained by this test method is relevant and appropriate for use in engineering design. 1.2.1 As an option to this test, measuring coefficient of friction at temperatures other than 23°C is performed by heating/cooling only the plane while the sled is at ambient temperature. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 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. For a specific precautionary statement, see the end of 6.5 . Note 2: This test method is not equivalent to ISO 8295–1995, and results cannot be directly compared between the two methods. 1.5 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 Measurements of frictional properties on a film or sheeting are made by either sliding the film or sheeting over itself or over another substance. The coefficients of friction are related to the slip properties of plastic films that are of wide interest in packaging applications. These methods yield empirical data for control purposes in film production. Correlation of test results with actual performance can usually be established. 4.1.1 This test method includes testing at temperatures other than 23°C by heating only the plane while the sled is at ambient temperature. 4.2 Slip properties are generated by additives in some plastic films, for example, polyethylene. These additives have varying degrees of compatibility with the film matrix. Some of them bloom, or exude to the surface, lubricating it and making it more slippery. Because this blooming action will not always be uniform on all areas of the film surface, it is possible that values from these tests will be limited in reproducibility. 4.3 The frictional properties of plastic film and sheeting depend on the uniformity of the rate of motion between the two surfaces. Ensure that the rate of motion of the equipment is as carefully controlled as possible. 4.4 Data obtained by these procedures for some films or sheets are sensitive to the age of the film or sheet and the condition of the surfaces. The blooming action of many slip additives is time dependent. For this reason, it is sometimes meaningless to compare slip and friction properties of films or sheets produced at different times, unless it is desired to study this effect. 4.5 Frictional and slip properties of plastic film and sheeting are based on measurements of surface phenomena. Where products have been made by different processes, or even on different machines by the same process, their surface properties are dependent on the equipment or its running conditions. Such factors must be weighed in evaluating data from these methods. 4.6 The measurement of the static coefficient of friction is highly dependent on the rate of loading and on the amount of blocking occurring between the loaded sled and the platform due to variation in time before motion is initiated. 4.7 Ensure that the speed of response of the recorder, either electronic or mechanical, is not exceeded. 4.8 Some material specifications require modifications to this test method. The material specification shall be referenced before using this test method. Table 1 of Classification System D4000 lists the ASTM materials standards that currently exist.