GB/T 261-2021
Determination of flash point—Pensky-Martens closed cup method (English Version)

Standard No.

GB/T 261-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Latest

GB/T 261-2021

Replace

GB/T 261-2008

Scope

This document specifies a method for determining the flash point of flammable liquids, liquids with suspended particles, liquids whose surface tends to form a film under the test conditions, and other liquids using the Pensky-Martin closed-cell flash point tester. Note 1: Although this document can be used for kerosene with a flash point above 40 ℃, generally the flash point of kerosene is determined according to GB/T21789. Usually, the flash point of unused lubricating oil is determined according to GB/T3536. Note 2: Jet fuels with a flash point below 40 °C can use this document, but the precision of this document has not been verified. WARNING: Since some mixtures do not get the flash point defined in this document, what is obtained is a significantly increased flash fire (not the effect of the halo) and a flash change from blue to yellow-brown, continued heating Can cause the vapors surrounding the test cup to ignite. This document applies to samples with a flash point within the range of 40 ℃ to 370 ℃. This document includes three test steps, Step A, Step B and Step C. Step A applies to distillate fuels (including diesel, biodiesel blended fuels, heating oil, and turbine fuels), unused lubricating oils, paints and varnishes, and other homogeneous liquids not covered by Steps B and C. Step B is suitable for residual fuel oil, diluted bitumen, used lubricating oil, liquid with suspended particles, liquid whose surface tends to form a film under the test conditions or whose viscosity is not suitable for heating under the stirring speed and heating conditions specified in step A of liquid. Step C is applicable to the determination of BD100 biodiesel samples. This document does not apply to water-based paints and water-based varnishes. Note 3: When monitoring the lubricating oil system, in order to compare the flash points of unused lubricating oil and used lubricating oil, step A can also be used to determine the flash point of used lubricating oil, but this precision is only applicable to step B . Note 4: The flash point of water-based paints and varnishes can be determined according to GB/T5208; the flash point of liquids containing highly volatile components can be determined according to GB/T21775 or GB/T5208.

GB/T 261-2021 Referenced Document

• GB/T 20777 Paints and varnishes Examination and preparation of samples for testing
• GB/T 27867 Petroleum liquid.Automatic pipeline sampling
• GB/T 3186 Paints, varnishes and raw materials for paints and varnishes. Sampling
• GB/T 4756 Method for manual sampling of petroleum liquids

GB/T 261-2021 history

• 2021 GB/T 261-2021 Determination of flash point—Pensky-Martens closed cup method
• 2008 GB/T 261-2008 Determination of flash point.Pensky-Martens closed cup method
• 1983 GB/T 261-1983 Petroleum products--Determination of flash point--Closed cup method