ASTM C201-93(2019)e1

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: C201 − 93 (Reapproved 2019)
Standard Test Method for
Thermal Conductivity of Refractories
This standard is issued under the fixed designation C201; 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 (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—The conductivity factor in parentheses in 1.1 was corrected editorially from 2818 W/m·K to 28.8 W/m·K in
October 2022.
1. Scope C155Classification of Insulating Firebrick
C182Test Method for Thermal Conductivity of Insulating
1.1 This test method covers the determination of the com-
Firebrick
parative thermal conductivity of refractories under standard-
C202Test Method for Thermal Conductivity of Refractory
ized conditions of testing. This test method is designed for
Brick
refractories having a conductivity factor of not more than 200
2 C417Test Method for Thermal Conductivity of Unfired
Btu·in./h·ft ·°F(28.8W/m·K),forathicknessof1in.(25mm).
Monolithic Refractories
1.2 Detailed ASTM test methods to be used in conjunction
C767Test Method for Thermal Conductivity of Carbon
with this procedure in testing specific types of refractory
Refractories
materials are as follows: Test Method C182, Test Method
E220Test Method for Calibration of Thermocouples By
C202, Test Method C417, and Test Method C767.
Comparison Techniques
1.3 The values stated in inch-pound units are to be regarded
3. Significance and Use
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.1 The thermal conductivity of refractories is a property
and are not considered standard.
required for selecting their thermal transmission characteris-
1.4 This standard does not purport to address all of the tics.Usersselectrefractoriestoprovidespecifiedconditionsof
safety concerns, if any, associated with its use. It is the heat loss and cold face temperature, without exceeding the
responsibility of the user of this standard to establish appro- temperature limitation of the refractory. This test method
priate safety, health, and environmental practices and deter- establishes the testing for thermal conductivity of refractories
mine the applicability of regulatory limitations prior to use.
using the calorimeter.
1.5 This international standard was developed in accor-
3.2 This procedure requires a large thermal gradient and
dance with internationally recognized principles on standard-
steady-state conditions. The results are based upon a mean
ization established in the Decision on Principles for the
temperature.
Development of International Standards, Guides and Recom-
3.3 The data from this test method are suitable for specifi-
mendations issued by the World Trade Organization Technical
cation acceptance and design of multi-layer refractory con-
Barriers to Trade (TBT) Committee.
struction.
2. Referenced Documents
3.4 Theuseofthesedatarequiresconsiderationoftheactual
2.1 ASTM Standards: application environment and conditions.
C134Test Methods for Size, Dimensional Measurements,
and Bulk Density of Refractory Brick and Insulating 4. Apparatus
Firebrick
4.1 The apparatus shall conform in close detail with that
shown in the approved drawings. The equipment is shown in
Figs. 1 and 2, and the essential parts are as follows:
This test method is under the jurisdiction of ASTM Committee C08 on
Refractories and is the direct responsibility of Subcommittee C08.02 on Thermal
Properties.
Current edition approved Jan. 1, 2019. Published January 2019. Originally
approved in 1945. Last previous edition approved in 2013 as C201–93 (2013). The complete set of approved drawings necessary for the construction of the
DOI: 10.1520/C0201-93R19E01. apparatus and suggested operating instructions, each of which requires too much
For referenced ASTM standards, visit the ASTM website, www.astm.org, or space to be included with this test method, was originally drafted by the Insulating
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Products Division of Babcock and Wilcox Co. ASTM has been advised that these
Standards volume information, refer to the standard’s Document Summary page on drawings are no longer available. Subcommittee C08.02 is currently taking this
the ASTM website. issue under advisement.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C201 − 93 (2019)
Fig. 3). The separation between the calorimeter and the inner
guard shall be ⁄32 in. (0.8 mm).
4.1.3 WaterCirculatingSystem—Awatercirculatingsystem
shall be provided for supplying the calorimeter assembly with
water at constant pressure and at a temperature that is not
changing at a rate greater than 1°F (0.5°C)⁄h. The inlet water
pressure shall be at least the equivalent of 10 ft of hydrostatic
pressure (29.9 kPa). The inlet water temperature shall at all
times be within +5°F (+3°C) or −2°F (−1°C) of the room
temperature. Fig. 5 shows the arrangement that shall be used
for meeting these conditions. The regulating valves for con-
trollingtherateofwaterflowthroughthecalorimeterassembly
shall be capable of maintaining a constant rate of flow within
61% during the test period.
4.1.4 Instruments for Measuring Temperature of
Specimen—Calibrated thermocouples shall be embedded in
the test specimen for measuring the temperature. The electro-
motive force (emf) for the temperature readings shall be taken
with a potentiometer having an instrument error of not more
than 60.05 mV, and the cold junctions of the thermocouples
shall be immersed in a mixture of ice and water.
4.1.5 Instrument for Measuring Temperature Rise in Calo-
rimeter Water—A multiple differential thermocouple shall be
used for measuring within an accuracy of not less than 1% of
the temperature rise of the water flowing through the calorim-
eter. The thermocouple shall be immersed at least 3 ⁄2 in.
(89mm) in the inlet and outlet connections, and the junctions
shallbenotmorethan ⁄4in.(6mm)distantfromthebottomof
the calorimeter. A calibrated differential 10X copper-
NOTE 1—The upper half of the heating chamber has been raised to
constantan thermocouple shall be used, and the millivolt
permit introduction of the test samples.
readings shall be taken with a potentiometer having an instru-
ment error of not more than 60.01 mVin the range between 0
FIG. 1 Photograph of Thermal Conductivity Apparatus
and2mV.
4.1.6 Instruments for Measuring Temperature Difference
4.1.1 Heating Chamber—Aheating chamber, shown in Fig.
BetweenCalorimeterandInnerGuard—Calibrateddifferential
3, shall be capable of being heated electrically over a tempera-
10X copper-constantan thermocouples shall be located in the
turerangefrom400to2800°F(205to1540°C)inaneutralor
calorimeter and inner guard for measuring the temperature
oxidizingatmosphere.Thetemperatureoftheheatingunitshall
differences between the calorimeter and inner guard. The
be controlled by a mechanism capable of maintaining the
temperature difference during a test shall be maintained at a
temperature in the chamber constant to within 65°F(63°C).
value less than 60.05°F (60.03°C). The thermocouple junc-
A silicon carbide slab 13 ⁄2 by 9 by 1 in. (342 by 228 by
tions shall be placed in the four wells provided for that
25mm), with the 13 ⁄2 by 9-in. (342 by 228-mm) faces plane
purpose, and millivolt readings shall be taken with a potenti-
and parallel, shall be placed above the sample for the purpose
ometerhavinganinstrumenterrorofnotmorethan 60.01mV
of providing uniform heat distribution. A layer of insulation
in the range between 0 and 2 mV.
equivalent at least to 1 in. (25 mm) of Group 20 insulating
firebrick (see Classification C155) shall be placed below the 5. Test Sample and Its Preparation
calorimeter and guard plates.
5.1 TestSample—Thetestsampleshallconsistofthree9-in.
4.1.2 Calorimeter Assembly—A copper calorimeter
1 1
(228-mm)straightbrickandsix9by2 ⁄2by2 ⁄4-in.(228by64
assembly, of the design shown in Fig. 4, shall be used for
by 57-mm) soap brick (Note 2) that are representative of the
measuring the quantity of heat flowing through the test
material being tested. These brick shall be selected for unifor-
specimen. The water circulation is such that adjacent passages
mity of structure and bulk density, and they shall be free of
contain incoming and outgoing streams of water. T
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