ASTM D6743-20
Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids

Standard No.

ASTM D6743-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D6743-20

Scope

1.1 This test method covers the determination of the thermal stability of unused organic heat transfer fluids. The procedure is applicable to fluids used for the transfer of heat at temperatures both above and below their boiling point (refers to normal boiling point throughout the text unless otherwise stated). It is applicable to fluids with maximum bulk operating temperature between 260 °C (500 °F) and 454 °C (850 °F). The procedure shall not be used to test a fluid above its critical temperature. In this test method, the volatile decomposition products are in continuous contact with the fluid during the test. This test method will not measure the thermal stability threshold (the temperature at which volatile oil fragments begin to form), but instead will indicate bulk fragmentation occurring for a specified temperature and testing period. Because potential decomposition and generation of high pressure gas may occur at temperatures above 260 °C (500 °F), do not use this test method for aqueous fluids or other fluids which generate high-pressure gas at these temperatures. 1.2 DIN Norm 51528 and GB/T 23800 cover other test methods that are similar to this test method. 1.3 The applicability of this test method to siloxane-based heat transfer fluids has not been determined. 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 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 7.2, 8.8, 8.9, and 8.10. 1.6 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.

ASTM D6743-20 Referenced Document

• ASTM D2887 Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
• ASTM D4175 Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants*， 2023-07-01 Update
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D6743-20 history

• 2020 ASTM D6743-20 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2011 ASTM D6743-11(2015) Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2011 ASTM D6743-11 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2006 ASTM D6743-06(2011) Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2006 ASTM D6743-06 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2001 ASTM D6743-01e1 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• 2001 ASTM D6743-01 Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids