ASTM E831-05

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Designation:E831–05
Standard Test Method for
Linear Thermal Expansion of Solid Materials by
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Thermomechanical Analysis
This standard is issued under the fixed designation E831; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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1.1 This test method determines the apparent coefficient of 2.1 ASTM Standards:
linear thermal expansion of solid materials using thermome- D696 Test Method for Coefficient of Linear Thermal Ex-
chanicalanalysistechniques.Relatedinformationcanbefound pansion of Plastics Between−30 and 30 °C
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in Refs. (1-12) . D3386 Test Method for Coefficient of Linear Thermal
1.2 This test method is applicable to solid materials that Expansion of Electrical Insulating Materials
exhibit sufficient rigidity over the test temperature range such E228 Test Method for Linear Thermal Expansion of Solid
that the sensing probe does not produce indentation of the Materials with a Vitreous Silica Dilatometer
specimen. E473 Terminology Relating to Thermal Analysis
1.3 The recommended lower limit of coefficient of linear E1142 TerminologyRelatingtoThermophysicalProperties
thermal expansion measured with this test method is 5 µm/ E1363 Test Method for Temperature Calibration of Ther-
(m·°C). The test method may be used at lower (or negative) momechanical Analyzers
expansion levels with decreased accuracy and precision (see E2113 Test Method for Length Change Calibration of
Section 11). Thermomechanical Analyzers
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1.4 This test method is applicable to the temperature range 2.2 ISO Standards:
from −120 to 900 °C. The temperature range may be extended ISO 11359-2 Plastics—Thermomechanical Analysis
depending upon the instrumentation and calibration materials (TMA)—Part 2: Determination of Coefficient of Linear
used. Thermal Expansion and Glass Transition Temperature
1.5 Computer or electronic based instruments, techniques,
3. Terminology
or data treatment equivalent to this test method may also be
used. 3.1 Definitions—Thermal analysis terms in Terminologies
E473 and E1142 shall apply to this test method.
NOTE 1—Users of this test method are expressly advised that all such
3.2 Definitions of Terms Specific to This Standard:
instrumentsortechniquesmaynotbeequivalent.Itistheresponsibilityof
3.2.1 apparent coeffıcient of linear thermal expansion,
the user to determine the necessary equivalency prior to use.
(a )—the change in length, relative to the specimen length at
m
1.6 SI values are the standard.
ambient temperature, accompanying a unit change in tempera-
1.7 This test method is related to ISO11359-2 but is
ture identified by the midpoint temperature of the temperature
significantly different in technical detail.
range of measurement
1.8 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 This test method uses a thermomechanical analyzer or
priate safety and health practices and determine the applica-
similar device to determine the linear thermal expansion of
bility of regulatory limitations prior to use.
solid materials when subjected to a constant heating rate.
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ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
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Measurements and is the direct responsibility of Subcommittee E37.01 on Test For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Methods and Recommended Practices. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved May 1, 2005. Published June 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1981. Last previous edition approved in 2003 as E831–03. the ASTM website.
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Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof AvailablefromtheAmericanNationalStandardsInstitute,11W.42ndSt.,13th
this standard. Floor, New York, NY 10036.
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E831–05
4.2 The change of the specimen length is electronically 6.2 Cooling Capability, to sustain a subambient specimen
recorded as a function of temperature.The coefficient of linear temperature(ifsubambientmeasurementsaretobemade)orto
thermal expansion can be calculated from these recorded data. hasten cool down of the specimen from elevated temperatures.
6.3 Micrometer, or other length-measuring device with a
range of up to 10 mm to determine specimen dimensio
...