1.1本试验方法包括测定粉尘-空气混合物的最小浓度，该混合物将在体积为20 L或更大的近球形密闭容器中传播爆燃。 注1-最小爆炸浓度（MEC）也称为爆炸下限（LEL）或稀燃极限（LFL）。 1.2从本试验方法获得的数据提供了尘云爆燃特性的相对测量值。 1.3本试验方法应用于测量和描述受控实验室条件下材料对热和火焰的响应特性，不应用于描述或评估实际火灾条件下材料、产品或组件的火灾危险或火灾风险。 然而，该测试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。 1.5本标准无意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建立适当的安全和健康实践，并确定监管限制的适用性。第8节给出了具体的预防说明。

1.1 This test method covers the determination of the minimum concentration of a dust-air mixture that will propagate a deflagration in a near-spherical closed vessel of 20 L or greater volume. Note 1-The minimum explosible concentration (MEC) is also referred to as the lower explosibility limit (LEL) or lean flammability limit (LFL). 1.2 Data obtained from this test method provide a relative measure of the deflagration characteristics of dust clouds. 1.3 This test method should be used to measure and describe the properties of materials 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 may be used as elements of a fire risk assessment that takes into account all of the factors that 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 the 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8.