1.1 这些试验方法包括在使用小型闭杯装置时，确定材料是否在规定温度下闪光（闪光/不闪光方法a）或确定材料闪光的最低有限温度（方法B）的程序。本试验方法适用于闪点在0 °C和110 °C（32 °F和230 °F），粘度低于15 000毫米 2. /s（cSt）25 摄氏度（77 °F）。 注1: 可以在较高或较低温度下进行测试，但精度尚未确定。 注2: 更粘稠的材料可以根据 附件A4 . 注3: 有机过氧化物可以按照 附件A5 ，描述了适用的安全预防措施。 注4: 美国劳工部（OSHA，Hazard Communications）、美国运输部（RSPA）和美国环境保护局（EPA）已规定了测试方法 D3278页 作为其法规中确定液体闪点的几种可接受方法之一。 1.2 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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量和火焰的响应，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。 1.5 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 闪点测量受控实验室条件下试样对热源和点火源的响应。这只是评估材料整体易燃性危险时必须考虑的众多特性之一。 5.2 政府监管机构在运输和安全法规中使用闪点来定义易燃和可燃材料并对其进行分类。有关这些类别的精确定义，请参阅相关的特定法规。 5.3 闪点可以表示给定液体中可能存在高挥发性和易燃杂质或污染物，例如溶剂精制干性油中存在残留溶剂。 5.4 这些平衡闪点测试方法使用较小的试样（2 mL）和更短的测试时间（1 min）比传统的非平衡测试方法，如测试方法 D56 和试验方法 D93 . 5.5 试验方法 D3828 ，试验方法 D8174 和ISO 3679是类似的试验方法，并使用相同的仪器。

1.1 These test methods cover procedures for determining whether a material does or does not flash at a specified temperature (flash/no flash Method A) or for determining the lowest finite temperature at which a material does flash (Method B), when using a small scale closed-cup apparatus. The test methods are applicable to paints, enamels, lacquers, varnishes, solvents, and related products having a flash point between 0 °C and 110 °C (32 °F and 230 °F) and viscosity lower than 15 000 mm 2 /s (cSt) at 25 °C (77 °F). Note 1: Tests at higher or lower temperatures are possible however the precision has not been determined. Note 2: More viscous materials can be tested in accordance with Annex A4 . Note 3: Organic peroxides can be tested in accordance with Annex A5 , which describes the applicable safety precautions. Note 4: The U.S. Department of Labor (OSHA, Hazard Communications), the U.S. Department of Transportation (RSPA), and the U.S. Environmental Protection Agency (EPA) have specified Test Methods D3278 as one of several acceptable methods for the determination of flash point of liquids in their regulations. 1.2 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. 1.3 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 ====== 5.1 Flash point measures the response of the test specimen to heat and ignition source under controlled laboratory conditions. It is only one of a number of properties that must be considered in assessing the overall flammability hazard of a material. 5.2 Flash point is used in shipping and safety regulations by governmental regulatory agencies to define flammable and combustible materials and to classify them. Consult the particular regulation involved for precise definitions of these classes. 5.3 Flash point can indicate the possible presence of highly volatile and flammable impurities or contaminants in a given liquid, such as the presence of residual solvents in solvent-refined drying oils. 5.4 These equilibrium flash point test methods use a smaller specimen (2 mL) and a shorter test time (1 min) than traditional non-equilibrium test methods such as Test Method D56 and Test Methods D93 . 5.5 Test Methods D3828 , Test Method D8174 , and ISO 3679 are similar test methods and use the same apparatus.