1.1 该试验方法提供了塑料密封封头鼓的环境应力抗裂性指示，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塑料桶在存在化学和物理应力时的抗破裂能力。 1.3 提供了以下两个程序: 1.3.1 程序A- 壬基苯氧基聚（乙氧基）乙醇溶液的内压抗裂方法，一种应力开裂试剂。 内部压力控制在恒定的升高压力和温度下。 1.3.2 程序B- 应力开裂试剂壬基苯氧基聚乙醇的顶荷载抗应力开裂方法。压缩顶部负载被控制在恒定的重量，同时保持升高的温度。 1.4 尽管这些程序不是为了测试封盖或封盖垫片材料保留测试试剂的能力而设计的，但将封盖失效作为容器失效模式是可选的。 然而，通过封闭件的泄漏可能会影响内部压力，从而影响测试结果。 1.5 本试验方法并未试图解决可能导致塑料桶应力开裂的所有因素。本标准的用户可以使用其他测试参数，如顶部负荷、化学试剂等，如用户和供应商在卷筒鉴定或采购协议中商定的参数。 1.6 以英寸-磅单位表示的数值应视为标准。 括号中给出的国际单位制仅供参考。 1.7 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 . 1.8 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 这些程序提供了塑料密封头鼓的环境应力抗裂性的指示。该试验方法可用于确定各种塑料树脂的适用性、模具设计、加工技术和塑料密封头鼓的参数。 5.2 环境应力开裂是指容器在应力条件下暴露于化学试剂（如肥皂、有机物、漂白剂或任何表面活性溶液）时的结果。 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 这两种程序通过为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。本试验方法可用作塑料密封件的设计鉴定和审核工具- 头部鼓。 5.5 该测试方法并非旨在提供测量的定量值（即失效天数）。根据用户规范或用户与供应商之间的约定，本程序仅作为合格/不合格程序。它不打算作为现场故障时间的预测器或指标。

1.1 This test method provides an indication of the environmental stress crack resistance of plastic tight-head drums 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 plastic drum's resistance to 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— Internal pressure stress crack resistance method to nonyl phenoxypoly (ethyleneoxy) ethanol solution, a stress cracking reagent. The internal pressure is controlled at a constant elevated pressure and temperature. 1.3.2 Procedure B— Top-load stress crack resistance method to nonyl phenoxypoly ethanol, a stress cracking reagent. The compressive top-load is controlled at a constant weight while maintaining an elevated temperature. 1.4 Although these procedures are not designed to test the ability of the closure or closure gasket material to retain the test reagent, the inclusion of closure failure as a container failure mode is optional. However, leakage through a closure may affect the internal pressure that could affect the test results. 1.5 This test method does not attempt to address all factors that could lead to stress cracking of plastic drums. The user of this standard may use other test parameters, such as top-loads, chemical reagents, etc., as agreed upon between the user and supplier in the event of a drum qualification or purchase agreement. 1.6 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only. 1.7 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 . 1.8 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 plastic tight-head drums. This test method may be used for determining the applicability of various plastic resins, mold designs, processing techniques, and parameters for plastic tight-head drums. 5.2 Environmental stress cracking is indicative of what results when a container is exposed to chemical agents such as soaps, organics, bleaches, or any surface-active solutions while under 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 Both procedures minimize the potential for test variability by providing the user with rigidly defined test conditions. This test method may be used as design qualification and auditing tools for plastic tight-head drums. 5.5 This test method is not meant to provide a quantitative value of measurement (that is, number of days to failure). It is intended only as a pass/fail procedure in accordance with user’s specifications, or as agreed upon between the user and supplier. It is not intended as a predictor or indicator of field performance regarding time to failure.