1.1 本试验方法涵盖了当给定尘云暴露于在当地大气压力下在炉中加热的空气中时自燃的最低温度。 1.2 从本试验方法获得的数据提供了尘云自燃温度的相对测量值。 1.3 本试验方法应用于测量和描述材料、产品或组件在受控实验室条件下对热和火焰的响应特性，不应用于描述或评估材料、产品或组件在实际火灾条件下的火灾危险或火灾风险。然而，本试验方法的结果可作为火灾风险评估的要素，该评估考虑了与特定最终用途火灾危险评估相关的所有因素。 1.4 以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.5 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。 1.6 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====== 5.1 本试验方法提供了一个进行实验室试验的程序，以确定尘云的最低自燃温度（MAIT）。 5.2 根据本试验方法得出的试验数据可用于限制尘云暴露的温度，以防止尘云着火。由于试验持续时间较短，获得的数据最适用于粉尘以云状存在的工业设备。由于试验规模较小，且MAIT值可能随规模变化，因此通过本试验方法获得的数据可能不直接适用于所有工业条件。 5.3 MAIT数据还可以与最小火花点火数据结合使用，以评估存在尘云时磨削和冲击火花的危害 ( 1和 2. ) . 3. 5.4 获得的测试值特定于所测试的样品、使用的方法和使用的测试设备。试验值不被视为固有材料常数，但可作为尘云自燃温度的相对测量值。 5.5 测试数据用于云点火。与相同的云状粉尘相比，层状粉尘可能在显著较低的温度下点燃 ( 3. ) . 液体化学品见试验方法 E659 .

1.1 This test method covers the minimum temperature at which a given dust cloud will autoignite when exposed to air heated in a furnace at local atmospheric pressure. 1.2 Data obtained from this test method provide a relative measure of dust cloud autoignition temperatures. 1.3 This test method should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test method may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 This test method provides a procedure for performing laboratory tests to determine the minimum autoignition temperature (MAIT) of a dust cloud. 5.2 The test data developed from this test method can be used to limit the temperature to which a dust cloud is exposed so as to prevent ignition of the cloud. Because of the short duration of the test, the data obtained are most applicable to industrial equipment where dust is present as a cloud for a short time. Because of the small scale of the test and the possible variation of the MAIT value with scale, the data obtained by this test method may not be directly applicable to all industrial conditions. 5.3 The MAIT data can also be used in conjunction with minimum spark ignition data to evaluate the hazards of grinding and impact sparks in the presence of dust clouds ( 1 and 2 ) . 3 5.4 The test values obtained are specific to the sample tested, the method used, and the test equipment utilized. The test values are not to be considered intrinsic material constants, but may be used as a relative measure of the temperature at which a dust cloud self ignites. 5.5 The test data are for cloud ignition. Dust in the form of a layer may ignite at significantly lower temperatures than the same dust in the form of a cloud ( 3 ) . For liquid chemicals, see Test Method E659 .