1.1 本试验方法包括测定在塑料薄膜和薄板（厚度为1 mm（0.04 in.）中传播撕裂所需的力或更少）。该方法不适用于测试期间发生脆性破坏的薄膜或薄片材料。 注1: 薄膜被任意定义为标称厚度不大于0.25 mm（0.010 in.）的薄板。 1.2 恒定握力分离率试验- 本试验方法采用固定试样的夹具的恒定分离速率。 1.2.1 在本试验方法中，可通过夹持分离来测量试样延伸。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.4 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2: 本标准类似于ISO 6383-1，但在技术上并不等同。ISO 6383-1的试样尺寸较大，该方法规定了不同的试验速度。 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法在评定各种塑料薄膜和具有可比厚度的薄板的抗撕裂扩展能力方面具有一定的价值。 对于高度可扩展的薄膜或薄片，试样支腿的变形能明显大于撕裂能。通过载荷时间或载荷位移数据，将轻微可扩展或不可扩展薄膜或片材中的撕裂传播阻力与高度可扩展薄膜或片材中的撕裂传播阻力区分开来( 图1 和 图2 ). 轻微可扩展或不可扩展材料的撕裂扩展力由平均撕裂力与高度可扩展材料的初始力和峰值力确定。 图1 低延伸膜的加载时间图 图2 高扩展胶片的加载时间图 5.2 只有在证明特定材料的数据具有可接受的再现性后，才可将本试验方法用于规范验收试验。 5.3 通过本试验方法获得的数据为撕裂等级提供了信息- 类似成分的塑料薄膜和片材的传播阻力。实际使用性能可能不一定与该测试方法的数据相关。来自不同厚度试样的数据集通常不具有可比性。 5.4 在继续使用本试验方法之前，应参考被测材料的规范。相关ASTM材料规范中涵盖的任何试样制备、调节、尺寸或测试参数，或其组合，应优先于本试验方法中提及的。如果没有相关的ASTM材料规范，则默认条件适用。分类系统表1 D4000 列出了当前存在的ASTM材料标准。

1.1 This test method covers the determination of the force necessary to propagate a tear in plastic film and thin sheeting (thickness of 1 mm (0.04 in.) or less) by a single-tear method. The method is not applicable for film or sheeting material where brittle failures occur during testing. Note 1: Film has been arbitrarily defined as sheeting having nominal thickness not greater than 0.25 mm (0.010 in.). 1.2 Constant-Rate-of-Grip Separation Test— This test method employs a constant rate of separation of the grips holding the test specimen. 1.2.1 Specimen extension may be measured in this test method by grip separation. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided 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. Note 2: This standard is similar to ISO 6383-1, but is not considered technically equivalent. The specimen size for ISO 6383-1 is larger, and the method specifies different test speeds. 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 ====== 5.1 This test method is of value in rating the tear-propagation resistance of various plastic films and thin sheeting of comparable thickness. For highly extensible film or sheeting the deformation energy of the specimen legs is significantly greater than the tearing energy. The tear-propagation resistance in slightly extensible or non-extensible film or sheeting is distinguished from the tear-propagation resistance in highly extensible film or sheeting by the load-time or load-displacement data, ( Fig. 1 and Fig. 2 ). The tear-propagation force for slightly extensible or non-extensible material is determined from the average tear force versus the initial and peak force for a highly extensible material. FIG. 1 Load-Time Chart for Low-Extensible Film FIG. 2 Load-Time Chart for Highly Extensible Film 5.2 This test method shall be used for specification acceptance testing only after it has been demonstrated that the data for the particular material are acceptably reproducible. 5.3 The data obtained by this test method furnish information for ranking the tear-propagation resistance of plastic films and sheeting of similar composition. Actual use performance may not necessarily correlate with data from this test method. Sets of data from specimens of dissimilar thickness are usually not comparable. 5.4 Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM material specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM material specifications, then the default conditions apply. Table 1 of Classification Systems D4000 lists the ASTM materials standards that currently exist.