Standard No.:	GB/T 261-2008
English Name:	Determination of flash point - Pensky-Martens closed cup method
Chinese Name:	闪点的测定 宾斯基-马丁闭口杯法
Chinese Classification:	E30    Petroleum products in general
Professional Classification:	GB    National Standard
Issued by:	SAC
Issued on:	2008-08-25
Implemented on:	2009-2-1
Status:	superseded
Superseded by:	GB/T 261-2021 Determination of flash point—Pensky-Martens closed cup method
Superseded on:	2022-5-1
Abolished on:	2022-05-01
Superseding:	GB/T 261-1983 Petroleum products;Determination of flash point;Closed cup method
Language:	English
File Format:	PDF
Word Count:	7000 words
Price(USD):	170.0
Delivery:	via email in 1 business day

1 Scope 1.1 This standard specifies methods for determination of the flash point of the combustible liquid, liquids with suspended solids, liquids that tend to form a surface film under the test conditions and other liquids by the Pensky-Martens closed flash point tester. This standard is applicable to samples with a flash point above 40℃. Note: 1 Although kerosene with a flash point above 40℃, they may be also tested by using this standard; however, the flash point of kerosene is generally determined according to ISO 13736.Generally, the flash point of the used lubricating oil is determined according to GB/T 3536. 2 This standard may also be used to determine the jet fuel with the flash point below 40℃. However, the precision is not verified. 1.2 The test procedures in this standard include Procedure A and Procedure B. 1.2.1 Procedure A is applicable to paints that do not form a surface film and varnish, used lubricating oils and other petroleum products not covered in Procedure B. 1.2.2 Procedure B is applicable to residual fuel oils, cutback bitumen, used lubricating oils, liquids that tend to form a surface film, liquids with suspended solids and highly viscous materials (such as polymer solution and adhesives). Note: during the monitoring of the lubricating oil system, for the comparison of flash points of used and unused lubricating oils, Procedure A also may be used to determine the flash point of used lubricating oils. However, the precision of this standard is only applicable to Procedure B. 1.3 This standard is not applicable to water-borne paints or liquids containing highly volatile materials. Note 1: the flash point of water-borne paints may be determined according to GB/T 7634. For the flash point of liquids containing highly volatile materials may be determined according to ISO 1523 or GB/T 7634. 2 The precision data in this standard is only valid within the range of flash point described in Chapter 13.

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

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