1.1 本试验方法包括在非密闭环境中，当表面加热至800°C（1472°F）或更高2分钟时，在撞击热表面时，气体会点燃或不会点燃。 1.2 该测试方法可适用于在环境温度和压力下作为气体或液化气体的任何非自燃物质，特别是全球统一制度1B类气体。 1.3 本试验方法的使用应受到以下限制:不得使用闪点、自燃温度（AIT）或本方法条件下的性能等单一火灾危险特性来描述或评价材料、产品、组件或系统在实际火灾条件下的火灾危险或火灾风险。然而，在受控实验室条件下测量的火灾危险特性可用于正确描述材料、产品、组件或系统在所述受控条件下的响应。只有当评估考虑到与给定情况下火灾危险演变相关的所有因素时，在受控实验室条件下测量的特性才能用作危险或风险评估的要素。 1.4 该标准用于定量测量气体或液化气体在非静止环境中的实际表面点火温度。 1.5 以SI单位表示的值将被视为标准值。SI单位后括号中给出的值仅供参考，不被视为标准值。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。有关具体危害陈述，请参见章节 9 . 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 气体混合物的自燃温度(AIT)是气体混合物在没有外部点火源的情况下自燃的最低温度。AIT通常在大气压下测定，使用向大气开放的小型测试容器，其中气体快速注入测试容器并加热预定时间，观察点火或不点火（测试方法 E659 ).AIT通常不直接适用于现实世界的条件。因此，需要一种测试来确定气体或液化气体在更不受约束的环境中释放到热表面上时是否点燃或不点燃。

1.1 This test method covers a means for the discrimination between gases, which will ignite or not ignite when impinged on a hot surface when that surface is heated to 800 °C (1472 °F) or greater for a period of 2 min in a non-confined environment. 1.2 This test method may be applied to any non-pyrophoric substance that is a gas or liquefied gas, particularly GHS category 1B gases, at ambient temperature and pressure. 1.3 This test method should be used subject to the limitations that no single fire hazard property such as flash point, auto-ignition temperature (AIT), or the performance under the conditions of the present method shall be used to describe or appraise the fire hazard or fire risk of a material, product, assembly, or system under actual fire conditions. Fire hazard properties measured under controlled laboratory conditions may nevertheless be employed to describe properly the response of materials, products, assemblies, or systems under said controlled conditions. Properties measured under controlled laboratory conditions may be used as elements of hazard or risk assessment only when such assessments takes into account all of the factors that are pertinent to the evolution of the fire hazard of a given situation. 1.4 This standard is used to provide a quantitative measure of a gas’s or liquefied gas’s realistic surface ignition temperature in a non-quiescent environment. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units 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. For specific hazard statements, see Section 9 . 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 The autoignition temperature (AIT) of a gas mixture is the minimum temperature at which a gas mixture spontaneously ignites without an external ignition source. AIT is typically determined at atmospheric pressure, using small test vessels open to the atmosphere where gas is quickly injected into the test vessel and heated for a pre-determined time observing ignition or non-ignition (Test Method E659 ). AIT is often not directly applicable to real world conditions. Therefore, there is need for a test that determines if a gas or liquefied gas ignites or does not ignite when released onto a hot surface in a more unconstrained environment.