ASTM D5930-16

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Designation: D5930 − 16
Standard Test Method for
Thermal Conductivity of Plastics by Means of a Transient
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Line-Source Technique
This standard is issued under the fixed designation D5930; 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 3. Terminology
1.1 Thistestmethodcoversthedeterminationofthethermal
3.1 Definitions—Terminology used in this standard is in
conductivity of plastics over a temperature range from –40 to
accordance with Terminology D883.
400°C. It is possible to measure the thermal conductivity of
3.2 Definitions of Terms Specific to This Standard:
materials in the range from 0.08 to 2.0 W/m.K covering
3.2.1 temperature transient, n—the temperature rise associ-
thermoplastics, thermosets, and rubbers, filled and reinforced.
ated with the perturbation of a system, initially at a uniform
1.2 The values stated in SI units shall be regarded as
temperature. The system does not attain thermal equilibrium
standard.
during the transient.
1.3 This standard does not purport to address the safety
3.2.2 thermal conductivity, n—the time rate of steady heat
concerns, if any, associated with its use. It is the responsibility
flow/unit area through unit thickness of a homogeneous mate-
of the user of this standard to establish proper safety and
rialinadirectionperpendiculartothesurfaceinducedbyaunit
health practices and determine the applicability of regulatory
temperature difference.
limitations prior to use.
3.2.2.1 Discussion—Where other modes of heat transfer are
NOTE 1—There is no known ISO equivalent to this test method.
present in addition to conduction, such as convection and
radiation, this property often is referred to as the apparent
2. Referenced Documents
thermal conductivity, λ .
app
2
2.1 ASTM Standards:
3.2.2.2 Discussion—Thermal conductivity must be associ-
C177 Test Method for Steady-State Heat Flux Measure-
ated with the conditions under which it is measured, such as
ments and Thermal Transmission Properties by Means of
temperature and pressure, as well as the compositional varia-
the Guarded-Hot-Plate Apparatus
tion of the material. It is possible that thermal conductivity will
C518 Test Method for Steady-State Thermal Transmission
vary with direction and orientation of the specimen since some
Properties by Means of the Heat Flow Meter Apparatus
materialsarenotisotropicwithrespecttothermalconductivity.
C1113 Test Method for Thermal Conductivity of Refracto-
In the case of thermoset polymers, it is possible that thermal
ries by Hot Wire (Platinum Resistance Thermometer
conductivity will vary with the extent of cure.
Technique)
D618 Practice for Conditioning Plastics for Testing 3.2.3 thermal diffusivity—a heat-transport property given by
the thermal conductivity divided by the thermal mass, which is
D883 Terminology Relating to Plastics
D2717 Test Method for Thermal Conductivity of Liquids a product of the density and the heat capacity.
E177 Practice for Use of the Terms Precision and Bias in
3.3 Symbols:
ASTM Test Methods
3.3.1 C—Probe constant.
E1225 Test Method for Thermal Conductivity of Solids
3.3.2 λ—Thermal conductivity, W/m.K.
Using the Guarded-Comparative-Longitudinal Heat Flow
Technique
3.3.3 Q—Heat output per unit length, W/m.
3.3.4 T —The temperature (K) recorded at time t .
2 2
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This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.30 on Thermal Properties.
3.3.5 T —The temperature (K) recorded at time t .
1 1
Current edition approved Sept. 1, 2016. Published September 2016. Originally
3.4 Subscript:
approved in 1997. Last previous edition approved in 2009 as D5930 - 09. DOI:
10.1520/D5930-16.
3.4.1 av—average.
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
3.4.2 app—apparent.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 3.4.3 ref—reference.
*A Summary of Changes section appears at the end of this standard
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D5930 − 16
4. Summary of Test Method
4.1 Line-Source Technique—This is a transient method for
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determining thermal conductivity (1, 2). Aline source of heat
is located at the center of the specimen being tested. The
apparatus is at a constant initial temperature. During the course
of the measurement, a known amount of heat produced by the
line-source results in a
...