GB/T 261-2008 in English

《GB/T 261-2008闪点的测定 宾斯基-马丁闭口杯法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
本标准规定了用宾斯基-马丁闭口闪点试验仪测定可燃液体、带悬浮颗粒的液体、在试验条件下表面趋于成膜的液体和其他液体闪点的方法。本标准适用于闪点高于４０ ℃的样品。 本标准代替ＧＢ／Ｔ２６１―１９８３《石油产品闪点测定法（闭口杯法）》，ＧＢ／Ｔ２６１―１９８３ 是参照采用ＩＳＯ２７１９：１９７３制定的。 本标准与ＧＢ／Ｔ２６１―１９８３相比主要变化如下：
―――本标准扩大了适用范围，除了石油产品之外，本标准还适用于表面不成膜的清漆和油漆等化工产品闪点；
―――ＧＢ／Ｔ２６１―１９８３对不同类型的样品规定了统一的试验步骤，且未明确规定搅拌转速；本标准
的试验步骤对不同类型的样品按步骤Ａ 和步骤Ｂ分别进行了叙述，且对升温速率和搅拌转速都做了明确规定；
―――本标准增加了术语、样品处理和仪器校验的相关内容；
―――ＧＢ／Ｔ２６１―１９８３规定了两支内标式温度计。本标准规定了三支棒式温度计，可根据样品的预期闪点选用；
―――ＧＢ／Ｔ２６１―１９８３中规定试样初次出现闪火后，再次点火，仍能继续闪火，试验结果被认为有效。本标准规定试样的观察闪点与最初点火温度的差值应在１８ ℃～２８ ℃范围之内；
―――本标准增加了自动仪器的使用，但规定仲裁试验以手动试验结果为准；
―――本标准增加了结果精确到０．５ ℃的规定；
―――本标准修改了精密度，且按不同类型的样品以步骤Ａ 和步骤Ｂ分别给出；
―――本标准增加了四个附录，附录Ａ《仪器校验》、附录Ｂ《宾斯基?马丁闭口闪点试验仪》、附录Ｃ《温度计技术规格》和附录Ｄ《温度计适配器》。

Scope

WARNING: The application of this standard may involve certain hazardous materials, operations and equipment. However, not all security issues related to this are advised. It is the user's responsibility to establish appropriate safety and protection measures and to clarify the scope of its restricted use before using this standard. 1.1 This standard specifies the method for determining the flash point of flammable liquids, liquids with suspended particles, liquids whose surface tends to form a film under test conditions, and other liquids by the Pensky-Martin closed-mouth flash point tester. This standard applies to samples with a flash point higher than 40°C. 1.2 The test procedure of this standard includes two parts, step A and step B. 1.2.1 Step A applies to paints and varnishes that do not form a film on the surface, virgin lubricating oils, and other petroleum products not included in Step B. 1.2.2 Step B is applicable to residual fuel oil, diluted bitumen, used lubricating oil, liquids whose surface tends to form a film, liquids with suspended particles, and highly viscous materials (such as polymer solutions and adhesives). 1.3 This standard is not applicable to aqueous paints or liquids containing highly volatile materials.

1 Scope
2 Normative References
3 Terms and Definitions
4 Summary of Method
5 Reagents and Materials
6 Apparatus
7 Apparatus Preparation
8 Sampling
9 Sample Handling
10 Test Procedure
11 Calculation
12 Expression of Results
13 Precision
14 Test Report
Appendix A (Informative) Apparatus Verification
Appendix B (Normative) Pensky-Martens Closed Flash Point Tester
Appendix C (Normative) Thermometer Specification
Appendix D (Informative) Thermometer Adaptor