1.1 本试验方法包括通过手动和自动闭式测试仪测定粘度低于5.5的液体的闪点 毫米 2. /s（cSt）在40 °C（104 °F），或低于9.5 毫米 2. /s（cSt）25 摄氏度（77 °F），闪点低于93 °C（200 °F）。 1.1.1 本试验方法中使用了两组试验条件:预期闪点的低温（LT）试验条件< 60 °C和高温（HT）试验条件下的预期闪点 ≥ 60 °C。 1.1.2 对于具有以下特性的液体的闭杯闪点:粘度为5.5 毫米 2. /s（cSt）或更高（40） °C（104 °F）；粘度为9.5 毫米 2. /s（cSt）或25时更高 摄氏度（77 °F）；闪点93 °C（200 °F）或更高；在试验条件下形成表面膜的趋势； 或含有悬浮固体的试验方法 D93 可以使用。 1.1.3 有关稀释沥青，请参阅测试方法 D1310 和 D3143 . 注1: 美国交通部（RSTA） 2. 美国劳工部（OSHA）已经确定闪点低于37.8的液体 °C（100 °F）是根据本试验方法测定的粘度小于5.5的液体的易燃性 毫米 2. /s（cSt）在40 °C（104 °F）或9.5 毫米 2. /s（cSt）或小于25 摄氏度（77 °F），或不含悬浮固体或在试验过程中不易形成表面膜。这些部门已使用本试验方法确定了液体的其他闪点分类。 1.2 本试验方法可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，不能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。 1.3 相关标准为试验方法 D93 , D1310 , D3828 , D3278页 和 D3941 . 1.4 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.5 警告 -许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。 当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.6 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。 有关具体警告声明，请参阅 6.5 , 7.1 , 9.3 , 11.1.4 ，并参考安全数据表。 1.7 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 闪点测量在受控实验室条件下样品与空气形成易燃混合物的趋势。这只是评估材料整体易燃性危险时应考虑的众多特性之一。 5.2 闪点在运输和安全法规中用于定义易燃和可燃材料。对于这些类别的精确定义，应参考相关的特定法规。 5.3 闪点可以表示在相对不挥发或不易燃的材料中可能存在高挥发性和易燃材料。例如，煤油样品上的异常低闪点可能表明汽油受到污染。

1.1 This test method covers the determination of the flash point, by Tag manual and automated closed testers, of liquids with a viscosity below 5.5 mm 2 /s (cSt) at 40 °C (104 °F), or below 9.5 mm 2 /s (cSt) at 25 °C (77 °F), and a flash point below 93 °C (200 °F). 1.1.1 Two sets of test conditions are used within this test method: low temperature (LT) test conditions for expected flash points < 60 °C, and high temperature (HT) test conditions for expected flash points of ≥ 60 °C. 1.1.2 For the closed-cup flash point of liquids with the following properties: a viscosity of 5.5 mm 2 /s (cSt) or more at 40 °C (104 °F); a viscosity of 9.5 mm 2 /s (cSt) or more at 25 °C (77 °F); a flash point of 93 °C (200 °F) or higher; a tendency to form a surface film under test conditions; or containing suspended solids, Test Method D93 can be used. 1.1.3 For cut-back asphalts refer to Test Methods D1310 and D3143 . Note 1: The U.S. Department of Transportation (RSTA) 2 and U.S. Department of Labor (OSHA) have established that liquids with a flash point under 37.8 °C (100 °F) are flammable as determined by this test method for those liquids that have a viscosity less than 5.5 mm 2 /s (cSt) at 40 °C (104 °F) or 9.5 mm 2 /s (cSt) or less at 25 °C (77 °F), or do not contain suspended solids or do not have a tendency to form a surface film while under test. Other flash point classifications have been established by these departments for liquids using this test method. 1.2 This test method can be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and cannot 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 can be used as elements of 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. 1.3 Related standards are Test Methods D93 , D1310 , D3828 , D3278 , and D3941 . 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.5 WARNING —Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use Caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 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. For specific warning statements see 6.5 , 7.1 , 9.3 , 11.1.4 , and refer to Safety Data Sheets. 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 ====== 5.1 Flash point measures the tendency of the specimen to form a flammable mixture with air under controlled laboratory conditions. It is only one of a number of properties that shall be considered in assessing the overall flammability hazard of a material. 5.2 Flash point is used in shipping and safety regulations to define flammable and combustible materials. One should 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 materials in a relatively nonvolatile or nonflammable material. For example, an abnormally low flash point on a sample of kerosene can indicate gasoline contamination.