1.1 本试验方法包括使用记录恒定拉伸速率型（CRE）拉伸试验机通过舌片（单次撕裂）程序测量织物的撕裂强度。 1.1.1 CRE型拉伸试验机已成为测定舌头撕裂强度的首选试验设备。人们认识到，一些恒速横移式（CRT）拉伸试验机仍在继续使用。因此，当买方和供应商达成一致意见时，可以使用这些测试仪器。CRT型拉伸试验机的使用条件包括在 附录X1 . 1.2 本试验方法适用于大多数织物，包括机织织物、安全气囊织物、毯子、尿布织物、针织织物、分层织物、绒毛织物和非- wovens。织物可以是未处理的、大尺寸的、涂覆的、树脂处理的或以其他方式处理的。提供了润湿或不润湿试样的测试说明。 1.3 按照本试验方法测量的撕裂强度要求在试验前开始撕裂。所获得的报告值与引发或开始撕裂所需的力没有直接关系。 1.4 提供了舌撕裂强度的两种计算方法:单个峰值力和五个最高峰值力的平均值。 1.5 以国际单位制或英寸磅单位表示的数值应视为标准。英寸磅单位可能是近似值。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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====== 5.1 这种测试方法被认为是令人满意的商业货物验收测试，因为目前对实验室间精度的估计是可以接受的，而且这种测试方法在验收测试行业中广泛使用。 5.1.1 如果在使用该测试方法进行商业装运的验收测试时，由于报告的测试结果存在差异而产生争议，买方和供应商应进行比较测试，以确定其实验室之间是否存在统计偏差。 建议提供适当的统计协助来调查偏差。作为最低要求，双方应采取一组尽可能均匀的试样，这些试样来自大量相关类型的织物。然后，应将试样以相等数量随机分配到每个实验室进行测试。在测试开始前，应使用适当的统计分析和双方选择的可接受概率水平对两个实验室的平均结果进行比较。如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意在考虑已知偏差的情况下解释未来的测试结果。 5.2 撕裂试验中记录的力是不规则的，因此，必须开发经验方法来获得与撕裂强度相关的可用值。 尽管报告值具有经验性质，但这些值被认为反映了以相同方式测试和测量的类似织物的比较性能。没有可用于所有织物的已知程序来确定最小撕裂强度。 5.3 根据试样的性质，数据记录设备将以一个或多个峰值的形式显示撕裂力。最高峰值似乎反映了纱线成分、纤维结合或纤维互锁的强度，无论是单独还是组合，都是阻止相同结构织物撕裂所需的。峰间记录的谷没有特别的意义。然而，最小撕裂力被指示为高于最低谷。 5.4 大多数纺织品都可以用这种测试方法进行测试。 由于给定织物的结构，可能需要对夹紧技术进行一些修改。坚固的织物或玻璃纤维制成的织物通常需要进行特殊调整，以防止它们在夹具中滑动或因夹在夹具中而损坏。 5.5 CRE型拉伸试验机已成为测定舌头撕裂强度的首选试验设备。人们认识到，一些恒速横移式（CRT）拉伸试验机仍在继续使用。因此，当买方和供应商达成一致意见时，可以使用这些测试仪器。CRT型测试仪的使用条件包括在 附录X1 .

1.1 This test method covers the measurement of the tearing strength of textile fabrics by the tongue (single rip) procedure using a recording constant-rate-of-extension-type (CRE) tensile testing machine. 1.1.1 The CRE-type tensile testing machine has become the preferred test apparatus for determining tongue tearing strength. It is recognized that some constant-rate-of-traverse-type (CRT) tensile testing machines continue to be used. As a consequence, these test instruments may be used when agreed upon between the purchaser and the supplier. The conditions for use of the CRT-type tensile tester are included in Appendix X1 . 1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knit fabrics, layered fabrics, pile fabrics and non-wovens. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Instructions are provided for testing specimens with or without wetting. 1.3 Tear strength, as measured in this test method, requires that the tear be initiated before testing. The reported value obtained is not directly related to the force required to initiate or start a tear. 1.4 Two calculations for tongue tearing strength are provided: the single-peak force and the average of five highest peak forces. 1.5 The values stated in either SI units or inch-pound units are to be regarded as the standard. The inch-pound units may be approximate. 1.6 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. 1.7 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 test method is used extensively in the trade for acceptance testing. 5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of fabric of the type in question. Test specimens then should be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias. 5.2 The force registered in a tear test is irregular, and as a consequence, empirical methods have had to be developed to obtain usable values related to tear strength. In spite of the empirical nature of the reported values, the values are considered to reflect comparative performance of similar fabrics tested and measured in the same way. No known procedure is available that can be used with all fabrics to determine the minimum tearing strength. 5.3 Depending on the nature of the specimen, the data recording devices will show the tearing force in the form of a peak or peaks. The highest peaks appear to reflect the strength of the yarn components, fiber bonds, or fiber interlocks, individually or in combination, needed to stop a tear in a fabric of the same construction. The valleys recorded between the peaks have no specific significance. The minimum tearing force, however, is indicated to be above the lowest valleys. 5.4 Most textile fabrics can be tested by this test method. Some modification of clamping techniques may be necessary for a given fabric due to its structure. Strong fabrics or fabrics made from glass fibers usually require special adaptation to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. 5.5 The CRE-type tensile testing machine has become the preferred test apparatus for determining tongue tearing strength. It is recognized that some constant-rate-of-traverse-type (CRT) tensile testing machines continue to be used. Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier. The conditions for use of the CRT-type tester are included in Appendix X1 .