ASTM C182-88(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C 182–88(Reapproved 2004)
Standard Test Method for
Thermal Conductivity of Insulating Firebrick
This standard is issued under the fixed designation C 182; 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 5. Test Sample
1.1 This test method supplements Test Method C 201, and 5.1 The test sample shall be selected and prepared as
shall be used in conjunction with that test method to determine described in the Test Sample and Preparation section of Test
the thermal conductivity of insulating firebrick. Method C 201.
1.2 The values stated in inch-pound units are to be regarded
6. Installation of Thermocouples in Test Specimen
as the standard. The values given in parentheses are provided
for information only. 6.1 Thermocouples—Calibrated thermocouples shall be
embeddedinthetestspecimenatthreepointsformeasuringthe
1.3 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the temperature. Chromel-Alumel thermocouples shall be used for
temperatures below 1400°F (760°C), and above that tempera-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- ture platinum-10 % rhodium/platinum thermocouples shall be
bility of regulatory limitations prior to use. used. The platinum thermocouples may also be used at the
lower temperatures, but the electromotive force (emf) will not
2. Referenced Documents
be as high as when using base-metal thermocouples. Wire of
2.1 ASTM Standards: AWG 28 (0.320 mm) shall be used for making either type of
C 155 Classification of Insulating Firebrick thermocouple.
C 201 Test Method for Thermal Conductivity of Refracto- 6.2 Installation of Thermocouples— Holes for the thermo-
ries couple wires shall be drilled through the 4 ⁄2-in. (114-mm)
E 220 Method for Calibration of Thermocouples by Com- dimension of the test specimen by the use of a drilling jig so as
parison Techniques to obtain accurate placement of the thermocouples. The three
thermocouples shall be located so that the hot junction of the
3. Significance and Use
first couple is 0.20 in. (5.1 mm) below the hot face of the test
3.1 The thermal conductivity of insulating firebrick (IFB) is specimen, the junction of the second at the midpoint, and the
a property required for the selection of IFB for a specific
junction of the third 0.20 in. above the cold face. The
thermal performance. Users select brick to provide a specified thermocouple wires leading out from the hot junctions shall be
heat-loss and cold-face temperature without exceeding the
located in planes parallel to the calorimeter surface. In order to
temperature limitation of the brick. This test method estab- have the hot junctions over the center of the calorimeter, they
lishes placement of thermocouples and the positioning of test
shall be located on an axis passing through the center of and at
samples in the calorimeter. This test method must be used with rightanglestothe9by4 ⁄2-in.(228by114-mm)areaofthetest
Test Method C 201.
specimen.
NOTE 1—Insulating firebrick that cannot be prepared to this precision
4. Apparatus
because of the structure of the product, should be prepared in accordance
4.1 The apparatus shall consist of that described in the
with the instructions for fireclay dense refractories.
Apparatus section of Test Method C 201 with the addition of
7. Set-Up of Test Sample and Silicon Carbide Slab
thermocouples, drilling jig, and refractory fiber paper as
described in Sections 6 and 7. 1 1
7.1 Two strips of refractory fiber paper 13 ⁄2 by ⁄2 by 0.02
in. (343 by 13 by 0.5 mm) shall be placed along the 13 ⁄2-in.
dimension of the inner guard at the outside edges, as shown in
This test method is under the jurisdiction of ASTM Committee C08 on
Fig. 1. Twelve strips of refractory fiber paper 2 by ⁄2 by 0.02
Refractories and is the direct responsibility of Subcommittee C08.02 on Thermal
Stress Resistance.
in. (51 by 13 by 0.5 mm) shall be placed on the outer guard at
Current edition approved Sept. 1, 2004. Published October 2004. Originally
intervals in the pattern shown in Fig. 1. These strips serve as
approved in 1943. Last previous edition C 182 – 88 (1998).
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
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Method E 220 specifies calibration procedures for thermocouples.
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C 182–88 (2004)
8. Procedure
8.1 Place the heating chamber in position, start the water
flowing through the calorimeter assembly, and supply the
current to the heating unit. Above a temperature of 1470°F
(800°C), the furnace atmosphere shall contain a minimum of
0.5 % oxygen with zero % combustibles. Take the atmosphere
samplefromthefurnacechamberproper,preferablyasnearthe
test specimen as possible. Maintain the rate of water flow
through the calorimeter between 120 and 200 g/min, and
determine by weighing the quantity of water collected during a
measured time period.The mass of water collected shall be not
less than 200 g and shall be weighed to an accuracy of 60.5 g.
The rate of flow shall be constant within6 1 % during the test
period.
8.2 Allow the furnace to reach a condition of steady state of
heat flow (test period), which shall be that condition when the
measured flow of heat into
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