1.1 本试验方法测量操作链锯时为保护下半身（腿）而穿的衣服和装置的耐切割性。 1.2 此测试方法可用于测试是否符合既定安全标准中的最低性能要求。 1.2.1 根据买方和供应商之间的协议，或根据既定安全标准的要求，将决定是否使用该测试方法来确定以下一项或两项:( 1. )链速度50（CS50），以及( 2. )在规定的链条速度下成功/失败（卡住/链条停止或在1.5秒内未切割）。 1.3 此测试方法可用于确定既定安全标准中规定的覆盖区域的防护等级。 1.4 以国际单位制表示的数值应视为标准。 注1: 每个系统中规定的值可能不是完全相等的；因此，每个系统都必须独立使用，而不需要以任何方式组合值。 1.5 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。 1.6 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 本试验方法的目的是提供一个可测量的性能标准，以衡量链锯操作员所穿不同类型的防护服和防护覆盖物的耐切割性。 5.2 该测试方法旨在展示防护服对链锯切割动作的抵抗力。 5.3 根据本测试方法测试的服装和覆盖物可通过以下方式实现保护:( 1. )材料在与锯链接触时对切割的切割阻力；( 2. )拉动材料的一部分或材料中的纱线，使得它们被拉入链条和驱动机构中以阻止链条运动；( 3. )所用材料的纤维表现出高的切割阻力和吸收旋转能量的能力，因此链的速度可以充分减慢，以停止锯链的运动；或( 4. )这些的任何组合。 5.4 该试验方法并不旨在评估下半身防护服的舒适性。 5.5 如果在使用该测试方法对商业货物进行验收测试时，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。 建议为调查偏差提供适当的统计协助。至少，双方应从同一批待评估部件中抽取一组试样。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。如果发现偏差，必须确定并纠正其原因，或者买方和供应商必须同意根据已知偏差解释未来的测试结果。

1.1 This test method measures cut resistance of garments and devices worn to protect the lower body (legs) when operating a chainsaw. 1.2 This test method may be used to test for compliance to minimum performance requirements in established safety standards. 1.2.1 By agreement between the purchaser and the supplier, or as required by established safety standards, it will be decided if this test method will be used to determine one or both of the following: ( 1 ) chain speed 50 (CS50), and ( 2 ) success/failure (jamming/chain stop or no cut in less than 1.5 s) at specified chain speed. 1.3 This test method may be used to determine levels of protection for areas of coverage as stipulated in established safety standards. 1.4 The values stated in SI units are to be regarded as standard. Note 1: The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining values in any way. 1.5 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. 1.6 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 The purpose of this test method is to provide a measurable criterion of performance about the level of cut resistance provided by different types of protective garments and protected coverings worn by chainsaw operators. 5.2 This test method is intended to show to what level a protective garment can offer resistance to the cutting action of a chainsaw. 5.3 The protection which can be demonstrated by the garments and coverings tested in accordance with this test method is achieved by: ( 1 ) the cut resistance of the material to cutting when put in contact with saw chain; ( 2 ) pulling a part of the material or yarns in the material so that they are drawn into the chain and drive mechanism to block the chain movement; ( 3 ) the fibers of the materials used to demonstrate both high resistance to cutting and the capacity to absorb rotational energy, so that chain speed can be slowed down sufficiently to stop the movement of the saw chain; or ( 4 ) any combination of these. 5.4 This test method does not purport to evaluate comfort of lower body protective garments. 5.5 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 perform 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 from the same lot of components to be evaluated. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. If a bias is found, either its cause must be determined and corrected or the purchaser and the supplier must agree to interpret future test results in light of the known bias.