ASTM D6743-20
(Test Method)Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
SIGNIFICANCE AND USE
5.1 Heat transfer fluids degrade when exposed to sufficiently high temperatures. The amount of degradation increases as the temperature increases or the length of exposure increases, or both. Due to reactions and rearrangement, degradation products can be formed. Degradation products include high and low boiling components, gaseous decomposition products, and products that cannot be evaporated. The type and content of degradation products produced will change the performance characteristics of a heat transfer fluid. In order to evaluate thermal stability, it is necessary to quantitatively determine the mass percentages of high and low boiling components, as well as gaseous decomposition products and those that cannot be vaporized, in the thermally stressed heat transfer fluid.
5.2 This test method differentiates the relative stability of organic heat transfer fluids at elevated temperatures in the absence of oxygen and water under the conditions of the test.
5.3 The user shall determine to his own satisfaction whether the results of this test method correlate to field performance. Heat transfer fluids in industrial plants are exposed to a variety of additional influencing variables. Interaction with the plant's materials, impurities, heat build-up during impaired flow conditions, the temperature distribution in the heat transfer fluid circuit, and other factors can also lead to changes in the heat transfer fluid. The test method provides an indication of the relative thermal stability of a heat transfer fluid, and can be considered as one factor in the decision-making process for selection of a fluid.
5.4 The accuracy of the results depends very strongly on how closely the test conditions are followed.
5.5 This test method does not possess the capability to quantify or otherwise assess the formation and nature of thermal decomposition products within the unstressed fluid boiling range. Decomposition products within the unstressed fluid boiling range may ...
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 Prin...
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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.
Designation: D6743 − 20
Standard Test Method for
1
Thermal Stability of Organic Heat Transfer Fluids
This standard is issued under the fixed designation D6743; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 Thistestmethodcoversthedeterminationofthethermal
stability of unused organic heat transfer fluids. The procedure
2. Referenced Documents
is applicable to fluids used for the transfer of heat at tempera-
2
2.1 ASTM Standards:
turesbothaboveandbelowtheirboilingpoint(referstonormal
D2887 Test Method for Boiling Range Distribution of Pe-
boiling point throughout the text unless otherwise stated). It is
troleum Fractions by Gas Chromatography
applicable to fluids with maximum bulk operating temperature
D4175 Terminology Relating to Petroleum Products, Liquid
between 260 °C (500 °F) and 454 °C (850 °F). The procedure
Fuels, and Lubricants
shall not be used to test a fluid above its critical temperature. In
E691 Practice for Conducting an Interlaboratory Study to
this test method, the volatile decomposition products are in
Determine the Precision of a Test Method
continuous contact with the fluid during the test. This test
3
method will not measure the thermal stability threshold (the
2.2 DIN Norms:
temperature at which volatile oil fragments begin to form), but
51528 Determination of the Thermal Stability of Unused
instead will indicate bulk fragmentation occurring for a speci-
Heat Transfer Fluids
4
fied temperature and testing period. Because potential decom-
2.3 China National Standard:
position and generation of high pressure gas may occur at
GB/T 23800 Heat transfer fluids – Determination of thermal
temperatures above 260 °C (500 °F), do not use this test
stability
method for aqueous fluids or other fluids which generate
high-pressure gas at these temperatures.
3. Terminology
1.2 DIN Norm 51528 and GB/T 23800 cover other test
3.1 Definitions:
methods that are similar to this test method.
3.1.1 thermal stability, n—the resistance to permanent
changes in properties caused solely by heat. D4175
1.3 The applicability of this test method to siloxane-based
heat transfer fluids has not been determined.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 decomposition products that cannot be vaporized,
1.4 The values stated in SI units are to be regarded as
n—materials from the thermally stressed heat transfer fluid,
standard. The values given in parentheses are for information
from which those fractions that can be vaporized are removed
only.
by distillation procedures, that are quantitatively determined as
1.5 This standard does not purport to address all of the
residues in a bulb tube distillation apparatus.
safety concerns, if any, associated with its use. It is the
3.2.2 fluid within the unstressed fluid boiling range, n—any
responsibility of the user of this standard to establish appro-
fluid components with boiling point between the initial boiling
priate safety, health, and environmental practices and deter-
point and final boiling point of the unstressed fluid.
mine the applicability of regulatory limitations prior to use.
For specific warning statements, see 7.2, 8.8, 8.9, and 8.10.
3.2.3 gaseous decomposition products, n—materials with
1.6 This international standard was developed in accor-
boiling points below room temperature, at normal pressure,
dance with internationally recognized principles on standard-
such as hydrogen and methane, that escape upon opening the
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
This test method is under the jurisdiction of ASTM Committee D02 on Standards volume information, refer to the standard’s Document Summary page on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of the ASTM website.
3
Subcommittee D02.L0.06 on Non-Lubricating Process Fluids. AvailablefromDeutschesInstitutfurNormunge.V.(DIN),Burggrafenstrasse6,
Current edition approved Dec. 1, 2020. Published December 2020. Originally 10787 Berlin, Germany, http://www.din.de.
4
approved in 2001. Last previous edition approved in 2015 as D6743 – 11 (2015). Available from China National Standards (GB), 106#
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6743 − 11 (Reapproved 2015) D6743 − 20
Standard Test Method for
1
Thermal Stability of Organic Heat Transfer Fluids
This standard is issued under the fixed designation D6743; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 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 covers a test method that isand 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 safety, health, and healthenvironmental 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D2887 Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3
2.2 DIN Norms:
51528 Determination of the Thermal Stability of Unused Heat Transfer Fluids
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.L0.06 on Non-Lubricating Process Fluids.
Current edition approved July 1, 2015Dec. 1, 2020. Published July 2015December 2020. Originally approved in 2001. Last previous edition approved in 20112015 as
D6743 – 11.D6743 – 11 (2015). DOI: 10.1520/D6743-11R15.10.1520/D6743-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Deutsches Institut fur Normung e.V.(DIN), Burggrafenstrasse 6, 10787 Berlin, Germany, http://www.din.de.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6743 − 20
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2.3 China National Standard:
GB/T 23800 Heat transfer fluids – Determination of thermal stability
3. Terminology
3.1 Definitions:
3.1.1 thermal stability, n—the resistance to permanent changes in properties caused solely by heat. D4175
3.2 Definitions of Terms Specific to This Standard:
3.2.1 decomposition products that cannot be vaporized, n—materials from the thermally stressed heat transfer fluid, from which
those fractions that can b
...
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