ASTM F433-98
(Practice)Standard Practice for Evaluating Thermal Conductivity of Gasket Materials
Standard Practice for Evaluating Thermal Conductivity of Gasket Materials
SCOPE
1.1 This practice covers a means of measuring the amount of heat transfer quantitatively through a material or system.
1.2 This practice is similar to the Heat Flow Meter System of Method C518, but modified to accommodate small test samples of higher thermal conductance.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety problems, 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.
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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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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.
Designation: F 433 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
1
Evaluating Thermal Conductivity of Gasket Materials
This standard is issued under the fixed designation F 433; 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. Scope
Dx 5 sample thickness, mm (in.)
2 2
A 5 sample cross-sectional area, m (ft )
1.1 This practice covers a means of measuring the amount
q 5 heat flow, W (Btu/h)
of heat transfer quantitatively through a material or system.
f5 heat flow transducer output, mV
1.2 This practice is similar to the Heat Flow Meter System
N 5 heat flow transducer calibration constant,
of Method C 518, but modified to accommodate small test
2 2
W/m ·mV (Btu/h·ft ·mV)
samples of higher thermal conductance.
2 2
Nf5 heat flux, W/m (Btu/h·ft )
1.3 The values stated in SI units are to be regarded as the
DT 5 temperature difference, °C (°F) or mV
standard. The values given in parentheses are for information
T 5 temperature of lower sample surface,° C (°F)
1
only.
or mV
1.4 This standard does not purport to address all of the
T 5 temperature of upper sample surface, °C (°F)
2
safety concerns, if any, associated with its use. It is the
or mV
responsibility of the user of this standard to establish appro-
T 5 temperature of HFT surface facing sample,° C
h
priate safety and health practices and determine the applica-
(°F) or mV
bility of regulatory limitations prior to use.
T 5 temperature of upper heater surface facing
c
sample, °C (°F) or mV
2. Referenced Documents
T 5 temperature,° C (°F)
2.1 ASTM Standards:
d5 total temperature drop across interfaces be-
C 518 Test Method for Steady-State Heat Flux Measure-
tween sample and adjacent surfaces, °C (°F)
ments and Thermal Transmission Properties by Means of
or mV
2
the Heat Flow Meter Apparatus
r5 coefficient of thermal resistance at interfaces,
2 2
D 2214 Test Method for Estimating the Thermal Conduc-
m ·K/W (h·ft ·°F/Btu)
3
tivity of Leather with the Cenco-Fitch Apparatus a5 correction constant
F 104 Classification System for Nonmetallic Gasket Mate- subscript s 5 unknown sample
4
subscript r 5 known calibration sample
rials
4. Summary of Practice
3. Terminology
4.1 The sample and the heat flow transducer (HFT) are
3.1 Definitions:
sandwiched between two controlled heater plates. The lower
3.1.1 thermal conductivity, k, of a solid material—the time
rate of steady heat flow, watts (or Btu/h), through a unit area, heater is set at a higher temperature than the upper plate to
2 2
produce a flow of heat through the sample. The differential of
m (or ft ), per unit temperature gradient in the direction
perpendicular to an isothermal surface °C/m (or° F/in.). The these two temperatures, DT, sensed by thermocouples, is
2
amplified along with the electrical output, f, of the HFT and is
k-factor is expressed W/m·K (Btu·in./h·ft ·°F).
3.2 Symbols:Symbols: directly proportional to the heat flow through the sample,
2 2
expressed as W/m (Btu/h·ft ). See Appendix for further infor-
mation. This recommended practice can be used for measuring
k 5 thermal conductivity, W/m·K (Btu·in./
heat transfer at a hot side temperature up to 200°C (392°F). See
2
h·ft ·°F)
Figs. 1-5.
2 2
C 5 thermal conductance, W/m ·K (Btu/h·ft ·°F)
5. Significance and Use
5.1 This practice is designed to compare related materials
1
under controlled conditions and their ability to maintain a
This practice is under the jurisdiction of ASTM Committee F-3 on Gaskets and
is the direct responsibility of Subcommittee F03.10 on Composite Gaskets. minimum amount of thermal conductance. Test results should
Current edition approved Nov. 10, 1998. Published January 1999.
be correlated with field results in order to predict heat transfer
2
Annual Book of ASTM Standards, Vol 04.06.
properties in particular applications.
3
Annual Book of ASTM Standards, Vol 15.04.
4
Annual Book of ASTM Standards, Vol 09.02. 5.2 This practice may be used as a routine test when agreed
1
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NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or
discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
F 433
FIG. 1 Heat Flow Meter Assembly With Water-Cooled Heat Sink
sample temperature between the lower and upper heater
plates.)
9.1.1 Release the compressive load, pull out the tray, and
load the sample. Care must be maintained to ensure that the
tray compartment is free of any foreign matter. Clean as
...
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