1.1 本试验方法用于评估飞机应用中使用的液压流体的耐火性，方法是通过使用皮下注射器在一个大气压下测定液压流体在空气中的自燃温度。 1.2 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.3 本标准用于测量和描述材料、产品或组件在受控条件下对热和火焰的响应，但其本身并不包括在实际火灾条件下对材料、产品或组件进行火灾危险或火灾风险评估所需的所有因素。 1.4 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。 1.5 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 4.1 自燃取决于材料的化学和物理性质以及用于其测定的方法和设备。给定方法的自燃温度不一定代表给定材料自燃的最低温度。在空气中点燃。所用容器的体积特别重要，因为在较大的容器中将实现较低的自燃温度。容器材料也可能是一个重要因素。 4.2 通过该试验方法确定的温度是空气氧化导致点火的温度。可以预期这些温度随测试压力和氧气浓度而变化。 4.3 本试验方法不是为评价能够放热分解的材料而设计的。对于这种材料，点火取决于分解的热和动力学性质、样品的质量和系统的传热特性。 4.4 本试验方法不用于评价在试验温度下熔化和蒸发或容易升华的固体化学品。4.5 本测试方法不用于测量在测试温度下为固体或液体的材料（例如，木材、纸张、棉花、塑料和高沸点化学品）的自燃温度。此类材料将在烧瓶中热降解，并且累积的降解产物可能点燃。 4.6 本试验方法不是为测量在大气温度和压力下为气态的化学品的自燃温度而设计的。

1.1 This test method is used for assessing the fire resistance of hydraulic fluids used for aircraft applications by determination of the autoignition temperature of the hydraulic fluid in air at one atmosphere pressure using hypodermic syringe injection. 1.2 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. 1.3 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions. 1.4 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. 1.5 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 Autoignition is dependent on the chemical and physical properties of the material and the method and apparatus employed for its determination. The autoignition temperature by a given method does not necessarily represent the minimum temperature at which a given material will self-ignite in air. The volume of the vessel used is particularly important since lower autoignition temperatures will be achieved in larger vessels. Vessel material can also be an important factor. 4.2 The temperatures determined by this test method are those at which air oxidation leads to ignition. These temperatures can be expected to vary with the test pressure and oxygen concentration. 4.3 This test method is not designed for evaluating materials which are capable of exothermic decomposition. For such materials, ignition is dependent upon the thermal and kinetic properties of the decomposition, the mass of the sample, and the heat transfer characteristics of the system. 4.4 This test method is not designed for evaluating for solid chemicals which melt and vaporize or which readily sublime at the test temperature. 4.5 This test method is not designed to measure the autoignition temperature of materials which are solids or liquids at the test temperature (for example, wood, paper, cotton, plastics, and high-boiling point chemicals). Such materials will thermally degrade in the flask and the accumulated degradation products may ignite. 4.6 This test method is not designed to measure the autoignition temperature of chemicals that are gaseous at atmospheric temperature and pressure.