ASTM E3142-18
(Test Method)Standard Test Method for Thermal Lag of Thermal Analysis Apparatus
Standard Test Method for Thermal Lag of Thermal Analysis Apparatus
SIGNIFICANCE AND USE
5.1 Differing temperature rates-of-change may be required for different measurements (for example, Test Method E698). Temperature calibration changes as a function of temperature rate-of-change. The use of the known thermal lag of an apparatus may be used to adjust the temperature calibration of the apparatus obtained at one temperature rate-of-change with that at another required for a given applications. This adjustment procedure for temperature calibration is described in 8.1.
5.2 This test method may be used in research, quality assurance, and specification acceptance.
SCOPE
1.1 This test method addresses the dependence of temperature calibration on the temperature rate-of-change. This test method describes the determination of the thermal lag of thermal analysis apparatus and its application to the modification of the temperature calibration for that apparatus obtained at alternative linear temperature rates-of-change.
1.2 This test method is applicable, but not limited to, the temperature calibration of differential thermal analyzers (DTAs), differential scanning calorimeters (DSCs), thermogravimetric analyzers (TGAs), thermomechanical analyzers (TMAs), and dynamic mechanical analyzers (DMAs).
1.3 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
1.4 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.
1.5 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.
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Designation: E3142 − 18
Standard Test Method for
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Thermal Lag of Thermal Analysis Apparatus
This standard is issued under the fixed designation E3142; 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.
INTRODUCTION
In thermal analysis, the temperature of a test specimen is changed while a physical property is
measured. The measured physical property is the dependent variable and temperature (also measured)
is the independent variable. In the majority of thermal analysis apparatus, temperature sensors cannot
be attached directly to the specimen but can only touch the surface or be placed adjacent or close to
the specimen such that the indicated temperature will be different to that of the specimen itself. In
consequence the specimen temperature will lag the indicated temperature upon heating and cooling
due to thermal resistance between sensor and specimen. The larger the test specimen, the greater the
thermal lag is likely to be. To obtain the correct specimen temperature, thermal analysis apparatus is
temperature calibrated so that the recorded temperature correctly indicates the specimen temperature.
Such temperature calibration compensates for the temperature offset (τ) between the specimen
temperature and that of the temperature sensor. This temperature offset changes linearly with
temperature rate-of-change (β) (heating or cooling). The slope of this linear relationship is known as
“thermal lag” (∆T/∆β). The thermal lag for an apparatus permits temperature calibration determined
at one temperature rate-of-change to be adjusted to that at other rates. It is the purpose of this standard
to aid the user to determine the thermal lag for an apparatus and to apply that thermal lag to
measurements made at temperature rates-of-change different from that at which the temperature
calibration is performed.
1. Scope responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 This test method addresses the dependence of tempera-
mine the applicability of regulatory limitations prior to use.
ture calibration on the temperature rate-of-change. This test
1.5 This international standard was developed in accor-
method describes the determination of the thermal lag of
dance with internationally recognized principles on standard-
thermal analysis apparatus and its application to the modifica-
ization established in the Decision on Principles for the
tion of the temperature calibration for that apparatus obtained
Development of International Standards, Guides and Recom-
at alternative linear temperature rates-of-change.
mendations issued by the World Trade Organization Technical
1.2 This test method is applicable, but not limited to, the
Barriers to Trade (TBT) Committee.
temperature calibration of differential thermal analyzers
2. Referenced Documents
(DTAs), differential scanning calorimeters (DSCs), thermogra-
2
vimetric analyzers (TGAs), thermomechanical analyzers
2.1 ASTM Standards:
(TMAs), and dynamic mechanical analyzers (DMAs).
E473 Terminology Relating to Thermal Analysis and Rhe-
ology
1.3 The values stated in SI units are to be regarded as the
E698 Test Method for Kinetic Parameters for Thermally
standard. No other units of measurement are included in this
Unstable Materials Using Differential Scanning Calorim-
standard.
etry and the Flynn/Wall/Ozawa Method
1.4 This standard does not purport to address all of the
E967 Test Method for Temperature Calibration of Differen-
safety concerns, if any, associated with its use. It is the
tial Scanning Calorimeters and Differential Thermal Ana-
lyzers
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ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
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Measurements and is the direct responsibility of Subcommittee E37.10 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Fundamental, Statistical and Mechanical Properties. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Jan. 15, 2018. Published February 2018. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/E3142-18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E3142 − 18
E1142 Terminology Relating to Thermophysical Properties 5.2 This test method may be used in research, quality
E1363 Test Method for Temperature Calibration of Thermo- assurance, and specification acceptance.
mechanical Analyzers
6. Interferences
E1582 Te
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