1.1 本试验方法提供了指示塑料注射成型开口桶、盖子和部件的环境应力抗裂性的程序，作为容器设计、树脂、制造条件、现场性能和其他因素影响的总和。 1.2 该试验方法可用于评估容器在存在化学和物理应力的情况下通过开裂而产生的机械破坏的抵抗力。 1.3 提供了以下两个程序: 1.3.1 程序A，规定的应力抗裂试验方法- 该程序特别适用于质量控制，因为规定了测试条件。 1.3.2 程序B，用户选择的应力抗裂试验方法- 该程序允许单独选择测试级别，特别适用于设计和开发工具。 1.4 这些程序不是为了测试盖衬垫材料或封盖保持测试试剂的能力而设计的。试剂通过这些开口的损失或泄漏不构成容器故障。然而，这可能表明内部压力损失可能会影响测试结果。 1.5 以英寸-磅单位表示的数值应视为标准值。括号中给出的数值是国际单位制的数学转换，仅供参考，不被视为标准。 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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 具体警告说明见 6.2 , 10.2.3 , 10.2.4 , 10.2.6 和 10.2.8 . 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》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 这些程序提供了所选组或批次的注塑开口桶、盖子和部件的环境应力抗裂性指示。如果每个容器的热历史是恒定的，则该试验方法可用于确定各种塑料树脂和模具设计对开口桶和盖子注射成型的适用性。 5.2 发生的环境应力裂纹表明当容器在应力环境条件下暴露于诸如肥皂、有机物或任何表面活性溶液的试剂时会产生什么结果。 5.3 环境应力开裂是一种化学侵蚀机制，它高度依赖于测试试剂、树脂、容器制造或加工历史、暴露温度、施加应力和其他因素。这些因素的组合可能导致最终的应力裂纹失效。 5.4 程序A通过向用户提供严格定义的测试条件，最大限度地降低了测试变化的可能性。该测试方法可用于注塑开口容器的生产质量控制。 5.5 程序B允许用户选择和评估极端的单个元素或几个测试级别对容器性能的交互作用。 这些条件是根据实验室经验和对配送环境的现有知识确定的。该试验方法可用于识别临界应力，该临界应力有助于容器设计或有助于在分布过程中尽量减少这些应力的发生。 5.6 本测试方法仅作为符合用户规范或用户与供应商约定的合格/不合格程序。它并非用于预测或指示现场故障时间的性能。

1.1 This test method provides procedures for an indication of the environmental stress crack resistance of plastic injection molded open head pails, covers, and components as a summation of the effects of container design, resin, manufacturing conditions, field performance, and other factors. 1.2 This test method may be used to evaluate a container's resistance to mechanical failure by cracking when in the presence of chemical and physical stresses. 1.3 Two procedures are provided as follows: 1.3.1 Procedure A, Specified Stress-Crack Resistance Test Method— This procedure is particularly useful for quality control since the conditions of the test are specified. 1.3.2 Procedure B, User Selected Stress-Crack Resistance Test Method— This procedure allows individual selection of test levels and is particularly useful as a design and development tool. 1.4 These procedures are not designed to test the ability of the cover gasketing material or closure to retain the test reagent. Loss or leakage of the reagent through these openings does not constitute container failure. However, this may indicate an internal pressure loss that might affect test results. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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. Specific warning statements are given in 6.2 , 10.2.3 , 10.2.4 , 10.2.6 , and 10.2.8 . 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 These procedures provide an indication of the environmental stress-crack resistance of injection molded open head pails, covers, and components from a selected group or lot. Provided the thermal history of each container is constant, this test method may be used for determining the applicability of various plastic resins and mold designs for injection molding of open head pails and covers. 5.2 The environmental stress-crack that occurs is indicative of what results when a container is exposed to agents such as soaps, organics, or any surface active solutions while under environmental conditions of stress. 5.3 Environmental stress-cracking is a mechanism of chemical attack that is highly dependent upon the test reagent, resin, container manufacturing or processing history, exposure temperature, applied stress, and other factors. The combination of these factors may result in eventual stress-crack failure. 5.4 Procedure A minimizes the potential for test variability by providing the user with rigidly defined test conditions. This test method may be used for production quality control of injection molded open head containers. 5.5 Procedure B allows the user to select and evaluate extreme individual elements or the interaction of several test levels on container performance. These conditions are established based on laboratory experience and available knowledge of the distribution environment. This test method may be used for identifying critical stresses which could aid in container design or help in minimizing the occurrence of these stresses during distribution. 5.6 This test method is intended only as a pass/fail procedure in accordance with the user's specification, or as agreed upon between the user and the supplier. It is not intended as a predictor or indicator of field performance regarding time to failure.