1.1 本试验方法包括液体和固体自燃温度的测定。这些材料必须在高压富氧环境中点燃，而无需使用火花或火焰。 1.2 本试验方法适用于2.1的压力 MPa至20.7 兆帕[300 psi至3000 磅/平方英寸]。方法描述中使用的压力为10.3 兆帕[1500 psi]，并且旨在适用于高压条件。如上所述，试验方法适用于点燃温度在60℃范围内的液体或固体 °C至500 °C[140 °F至932 °F]。 注1: 试验方法G72/G72M通常使用质量约为0.20±0.03g的样品，起始压力为10.3 兆帕[1500 psi]和5的温度斜坡速率 °C/min。然而，在其他试验条件下也可以获得自燃温度（AIT）。测试经验表明，挥发性液体的AIT测试可能受到样品预处理的影响- 条件和样品质量。这将在标准中作为特殊情况1在小节中进行说明 8.2.2 测试经验还表明，在低压下（即<2.1 MPa）可以显著地受到样品质量和温度斜坡速率的影响。这将在标准中作为特殊情况2在小节中进行处理 8.2.3 由于材料的AIT取决于样品质量/配置和试验条件，因此应在试验报告中明确指出与试验方法G72/G72M试验通常使用的标准条件的任何偏差。 1.3 本试验方法适用于高压纯氧。该试验方法可用于0.5 % 至100 % 氧气 1.4 描述了一种适用于这些要求的装置。该试验方法可应用于较高压力和较高点火温度的材料。如果需要比所述更严格的要求或其他氧化剂，则必须小心选择能够承受这些条件的替代安全设备。 1.5 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 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。 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====== 4.1 如果加热到足够高的温度和压力，大多数有机液体和固体将在加压的氧化气体气氛中点燃。该程序提供了在精心控制的条件下点火开始时的温度的数值。没有建立从这种理想情况外推到特定现场情况下火灾和爆炸危险的描述、评估或监管的方法。标准装置中几种材料的点火温度的排序通常符合现场经验。 4.2 材料自燃的温度（AIT）将随着测试系统的几何形状和加热速率而变化很大。为了实现良好的实验室间点火温度一致性，有必要使用与试验方法中所述尺寸大致相同的设备。还必须尽可能严格地遵循所述程序。 4.3 一些完全氟化的材料的分解和氧化释放的能量如此之少，以至于没有明确的点火迹象。如果样品在达到点火温度之前挥发，蒸馏到反应容器的另一部分，也不会有明确的点火迹象。

1.1 This test method covers the determination of the temperature at which liquids and solids will spontaneously ignite. These materials must ignite without application of spark or flame in a high-pressure oxygen-enriched environment. 1.2 This test method is intended for use at pressures of 2.1 MPa to 20.7 MPa [300 psi to 3000 psi]. The pressure used in the description of the method is 10.3 MPa [1500 psi], and is intended for applicability to high pressure conditions. The test method, as described, is for liquids or solids with ignition temperature in the range from 60 °C to 500 °C [140 °F to 932 °F]. Note 1: Test Method G72/G72M normally utilizes samples of approximately 0.20 ± 0.03-g mass, a starting pressure of 10.3 MPa [1500 psi] and a temperature ramp rate of 5 °C/min. However, Autogenous Ignition Temperatures (AIT) can also be obtained under other test conditions. Testing experience has shown that AIT testing of volatile liquids can be influenced by the sample pre-conditioning and the sample mass. This will be addressed in the standard as Special Case 1 in subsection 8.2.2 . Testing experience has also shown that AIT testing of solid or non-volatile liquid materials at low pressures (that is, < 2.1 MPa) can be significantly influenced by the sample mass and the temperature ramp rate. This will be addressed in the standard as Special Case 2, in subsection 8.2.3 . Since the AIT of a material is dependent on the sample mass/configuration and test conditions, any departure from the standard conditions normally used for Test Method G72/G72M testing should be clearly indicated in the test report. 1.3 This test method is for high-pressure pure oxygen. The test method may be used in atmospheres from 0.5 % to 100 % oxygen. 1.4 An apparatus suitable for these requirements is described. This test method could be applied to higher pressures and materials of higher ignition temperature. If more severe requirements or other oxidizers than those described are desired, care must be taken in selecting an alternative safe apparatus capable of withstanding the conditions. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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. 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 Most organic liquids and solids will ignite in a pressurized oxidizing gas atmosphere if heated to a sufficiently high temperature and pressure. This procedure provides a numerical value for the temperature at the onset of ignition under carefully controlled conditions. Means for extrapolation from this idealized situation to the description, appraisal, or regulation of fire and explosion hazards in specific field situations, are not established. Ranking of the ignition temperatures of several materials in the standard apparatus is generally in conformity with field experience. 4.2 The temperature at which material will ignite spontaneously (AIT) will vary greatly with the geometry of the test system and the rate of heating. To achieve good interlaboratory agreement of ignition temperatures, it is necessary to use equipment of approximately the dimensions described in the test method. It is also necessary to follow the described procedure as closely as possible. 4.3 The decomposition and oxidation of some fully fluorinated materials releases so little energy that there is no clear-cut indication of ignition. Nor will there be a clear indication of ignition if a sample volatilizes, distilling to another part of the reaction vessel, before reaching ignition temperature.