1.1 这些试验方法用于估计在含有指定臭氧浓度水平（以分压表示）的大气中，在动态或静态表面拉伸应变条件下暴露的影响（参见 注1 )，或根据经验确定。不包括自然产生的阳光或人工光源的影响。 1.2 先前发布的ASTM文件测试方法 D518 和试验方法 D3395 已包含在这些试验方法中， D1149 ，2007年。请参阅 注释2 . 1.2.1 试验方法 D518 和试验方法 D3395 从此被撤回并被试验方法取代 D1149 . 试验方法时 D1149 如果引用或以其他方式引用，则应包含具有此含义的注释。请参阅第节 3.2 以获取适当的参考。 1.3 与室外暴露相比，在受控环境中暴露于臭氧的特定条件加快。 这些加速臭氧试验方法可能不会给出与室外暴露试验或服务性能相关的结果。 1.4 用于测定质量、力、尺寸、臭氧浓度、分压、温度、速度和气体交换率的所有材料、仪器或设备应可直接追溯至国家标准与技术研究所或其他国际公认的平行组织。 1.5 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。许多规定的国际单位制是从美国习惯体系直接转换而来的，以适应1975年《公制转换法》之前存在的仪器、惯例和程序。 1.6 本标准涉及有害物质，特别是臭氧。它还可能涉及危险操作和设备。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1: 试验方法中提供了基于单位空气中臭氧部分与分压的臭氧浓度测量的讨论和解释 D4575 ，特别是附录X1和X2。试验方法 D4575 还建议将其作为涉及暴露于臭氧的材料的标准的背景信息来源。 1.7 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====== 4.1 这些试验方法的重要性在于能够在加速试验的有限和规定条件下区分耐臭氧度。通过标的材料表面裂纹的外观和形成程度来判断电阻的程度。 4.2 在使用中，橡胶材料暴露于臭氧时会变质。必须有一种试验方法，在这种方法中，可以对材料抵抗臭氧暴露引起的开裂的能力进行简单、加速的时间/暴露的比较进行经验评估。 此类测试可用于生产商/消费者验收、裁判、研究和开发。 4.3 这些方法不一定适合在采购规范中使用，因为由于地理位置不同，实际使用条件（户外暴露）差异很大，因此可能与使用性能没有相关性，因此可能不会产生可重复或可再现的结果。

1.1 These test methods are used to estimate the effect of exposure, under surface tensile strain conditions, either dynamic or static, in an atmosphere containing specified levels of ozone concentration, expressed as partial pressure (refer to Note 1 ), on vulcanized rubber, rubber compounds, molded or extruded soft rubber, and other specified materials, or as may be determined empirically. The effect of naturally occurring sunlight or light from artificial sources is excluded. 1.2 Previously published ASTM documents Test Method D518 and Test Methods D3395 have been included in these test methods, D1149 , in 2007. Please refer to Note 2 . 1.2.1 Test Method D518 and Test Methods D3395 have henceforth been withdrawn and superseded by Test Methods D1149 . When Test Methods D1149 is cited, or otherwise referenced, a notation shall be included to this effect. Please refer to section 3.2 for the appropriate references. 1.3 The specified conditions of exposure to ozone in the controlled environments are accelerated in comparison to outdoor exposure. These accelerated ozone test methods may not give results which correlate with outdoor exposure tests or service performance. 1.4 All materials, instruments, or equipment used for the determination of mass, force, dimension, ozone concentration, partial pressure, temperature, velocity, and gas exchange rate shall have direct traceability to the National Institute for Standards and Technology, or other internationally recognized organization parallel in nature. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. Many of the stated SI units are direct conversions from the U.S. Customary System to accommodate the instrumentation, practices, and procedures that existed prior to the Metric Conversion Act of 1975. 1.6 This standard involves hazardous materials, specifically ozone. It may also involve hazardous operations and equipment. 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 1: A discussion and explanation regarding the measurement of ozone concentrations based upon parts of ozone per unit of air versus partial pressure is provided in Test Methods D4575 , specifically Appendices X1 and X2. Test Methods D4575 is also recommended as a source of background information regarding standards involving materials exposed to ozone. 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 ====== 4.1 The significance of these test methods lies in the ability to differentiate between the degrees of ozone resistance under the limited and specified conditions of the accelerated tests. The degree of resistance being judged by the appearance and magnitude of the formation of cracks in the surface of the subject material. 4.2 In service, rubber materials deteriorate when exposed to ozone. It is imperative to have test methods in which simple, accelerated time/exposure, comparisons of the material’s ability to resist cracking caused by ozone exposure can be empirically evaluated. Such tests can be used for producer/consumer acceptance, referee purposes, research, and development. 4.3 These methods are not necessarily suited for use in purchase specifications as there may be no correlation with service performance as actual service conditions (outdoor exposure) vary widely due to geographic location and, therefore, may not yield repeatable or reproducible results.