ASTM D6743-01e1

Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids

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 is 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 are the standard. The values provided 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 7.2, 8.8, 8.9 and 8.10.

General Information

• Status: Historical
• Publication Date: 09-Dec-2001
• ICS: 27.060.30 - Boilers and heat exchangers
• ICS: 71.100.99 - Other products of the chemical industry
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.L0.06 - Non-Lubricating Process Fluids

Relations

• Replaces: ASTM D6743-01 - Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• Effective Date: 10-Dec-2001
• Replaced By: ASTM D6743-06 - Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
• Effective Date: 01-Dec-2006
• Referred By: ASTM D5372-20 - Standard Guide for Evaluation of Hydrocarbon Heat Transfer Fluids
• Effective Date: 10-Dec-2001
• Referred By: ASTM D7863-22 - Standard Guide for Evaluation of Convective Heat Transfer Coefficient of Liquids
• Effective Date: 10-Dec-2001
• Referred By: ASTM D7665-22 - Standard Guide for Evaluation of Biodegradable Heat Transfer Fluids
• Effective Date: 10-Dec-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
e1
Designation:D6743–01
Standard Test Method for
1
Thermal Stability of Organic Heat Transfer Fluids
This standard is issued under the fixed designation D 6743; 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 (e) indicates an editorial change since the last revision or reapproval.
1
e NOTE—Subscript “60” was inadvertently dropped from Paragraph 8.1 and replaced editorially in June 2003.
2
1. Scope Products, and Lubricants
2.2 DIN Norms:
1.1 Thistestmethodcoversthedeterminationofthethermal
51528 Determination of the Thermal Stability of Unused
stability of unused organic heat transfer fluids. The procedure
3
Heat Transfer Fluids
is applicable to fluids used for the transfer of heat at tempera-
turesbothaboveandbelowtheirboilingpoint(referstonormal
3. Terminology
boiling point throughout the text unless otherwise stated). It is
3.1 Definitions:
applicable to fluids with maximum bulk operating temperature
3.1.1 thermal stability, n—the resistance to permanent
between 260°C (500°F) and 454°C (850°F). The procedure
changes in properties caused solely by heat. D 4175
shall not be used to test a fluid above its critical temperature. In
3.2 Definitions of Terms Specific to This Standard:
this test method, the volatile decomposition products are in
3.2.1 decomposition products that cannot be vaporized,
continuous contact with the fluid during the test. This test
n—materials from the thermally stressed heat transfer fluid,
method will not measure the thermal stability threshold (the
from which those fractions that can be vaporized are removed
temperature at which volatile oil fragments begin to form), but
by distillation procedures, that are quantitatively determined as
instead will indicate bulk fragmentation occurring for a speci-
residues in a bulb tube distillation apparatus.
fied temperature and testing period. Because potential decom-
3.2.2 gaseous decomposition products, n—materials with
position and generation of high pressure gas may occur at
boiling points below room temperature, at normal pressure,
temperatures above 260°C (500°F), do not use this test method
such as hydrogen and methane, that escape upon opening the
for aqueous fluids or other fluids which generate high-pressure
test cell and that can be determined by measuring the mass
gas at these temperatures.
immediately thereafter.
1.2 DIN Norm 51528 covers a test method that is similar to
3.2.3 high boiling components, n—materials from the ther-
this test method.
mally stressed heat transfer fluid, with boiling points above the
1.3 The applicability of this test method to siloxane-based
final boiling point of the unstressed heat transfer fluid, but
heat transfer fluids has not been determined.
which can still be separated by distillation from the heat
1.4 The values stated in SI are the standard. The values
transfer fluid by means of classical separation procedures.
provided in parentheses are for information only.
3.2.4 low boiling components, n—materials from the ther-
1.5 This standard does not purport to address all of the
mally stressed heat transfer fluid, with boiling points below the
safety concerns, if any, associated with its use. It is the
initial boiling point of the unstressed heat transfer fluid.
responsibility of the user of this standard to establish appro-
3.2.5 mass percentage of high boiling components, n—the
priate safety and health practices and determine the applica-
percentage of thermally stressed heat transfer fluid with a
bility of regulatory limitations prior to use. For specific
boiling point above the final boiling point of the unstressed
precautionary statements, see 7.2, 8.8, 8.9 and 8.10.
fluid.
2. Referenced Documents 3.2.6 mass percentage of low boiling components, n—the
percentage of thermally stressed heat transfer fluid with a
2.1 ASTM Standards:
boiling point below the initial boiling point of the unstressed
D 2887 Test Method for Boiling Range Distribution of
2
fluid.
Petroleum Fractions by Gas Chromatography
3.2.7 original fluid, n—any fluid components with boiling
D 4175 Terminology Relating to Petroleum, Petroleum
point between the initial boiling point and final boiling point of
the unstressed fluid.
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.L0 on Industrial Lubricants.
3
Current edition approved Dec. 10, 2001. Published February 2002. Available from Beuth Verlag GmbH, Burrgrafen Strasse 6, 1000 Berlin 30
2
Annual Book of ASTM Standards, Vol 05.02. Germany.
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