Designation: E831 - 06 INTERNATIONAL Standard Test Method for Linear Thermal Expansion of Solid Materials by 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. A number in parentheses indicates the year of last reapproval. A superscript epsilon (s) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense 1. Scope priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. 1.1 This test method determines the apparent coefficient of linear thermal expansion of solid materials using thermome- 2. Referenced Documents chanical analysis techniques. Related information can be found 2.1 ASTM Standards.3 in Refs. (1, 2).2 D696 Test Method for Coefficient of Linear Thermal Ex. 1.2 This test method is applicable to solid materials that pansion of Plastics Between -30°C and 30°C with a exhibit sufficient rigidity over the test temperature range such Vitreous Silica Dilatometer that the sensing probe does not produce indentation of the D3386 Test Method for Coefficient of Linear Thermal specimen. Expansion of Electrical Insulating Materials4 1.3 The recommended lower limit of coefficient of linear E228 Test Method for Linear Thermal Expansion of Solid thermal expansion measured with this test method is 5 μm/ Materials With a Push-Rod Dilatometer (m.°C). The test method may be used at lower (or negative E473 Terminology Relating to Thermal Analysis and Rhe- expansion levels with decreased accuracy and precision (see ology Section 11). E1142 Terminology Relating to Thermophysical Properties 1.4 This test method is applicable to the temperature range E1363 Test Method for Temperature Calibration of Ther- from -120 to 900 °C. The temperature range may be extended momechanical Analyzers depending upon the instrumentation and calibration materials E2113 Test Method for Length Change Calibration of used. Thermomechanical Analyzers 1.5 Computer or electronic based instruments, techniques, 2.2 ISO Standards.5 or data treatment equivalent to this test method may also be ISO 11359-2 Plastics—Thermomechanical Analysis used. (TMA)Part 2: Determination of Coefficient of Linear Noe 1Users of this test method are expressly advised that all such Thermal Expansion and Glass Transition Temperature instruments or techniques may not be equivalent. It is the responsibility of the user to determine the necessary equivalency prior to use. 3. Terminology 1.6 The values stated in SI units are to be regarded as 3.1 Definitions-Thermal analysis terms in Terminologies standard. No other units of measurement are included in this E473 and E1142 shall apply to this test method. standard. 3.2 Definitions of Terms Specific to This Standard: 1.7 This test method is related to ISO 11359-2 but is 3.2.1 apparent coeficient of linear thermal expansion, significantly different in technical detail. (αm)the change in length, relative to the specimen length at 1.8 This standard does not purport to address all of the ambient temperature, accompanying a unit change in tempera- safety problems, if any, associated with its use. It is the ture identified by the midpoint temperature of the temperature responsibility of the user of this standard to establish appro- range of measurement 3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or 1 This test method is under the jurisdiction of ASTM Committee E37 on Thermal Measurements and is the direct responsibility of Subcommittee E37.10 on Funda- contact ASTM Customer Service at [email protected]. For Annual Book of ASTM mental, Statistical and Mechanical Properties. Standards volume information, refer to the standard's Document Summary page on approved March 15, 2006. Published April 2006. Originally Curren