ASTM C1043-06

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Designation:C1043–06
Standard Practice for
Guarded-Hot-Plate Design Using Circular Line-Heat
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Sources
This standard is issued under the fixed designation C1043; 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.
1. Scope platesfabricatedfromceramics,composites,orothermaterials;
or (5) the use of multiple line-heat sources in both the meter
1.1 This practice covers the design of a circular line-heat-
and guard plates.
source guarded hot plate for use in accordance with Test
1.6 This standard does not purport to address all of the
Method C177.
safety concerns, if any, associated with its use. It is the
NOTE 1—Test Method C177 describes the guarded-hot-plate apparatus
responsibility of the user of this standard to establish appro-
and the application of such equipment for determining thermal transmis-
priate safety and health practices and determine the applica-
sion properties of flat-slab specimens. In principle, the test method
bility of regulatory limitations prior to use.
includes apparatus designed with guarded hot plates having either
distributed- or line-heat sources.
2. Referenced Documents
1.2 The guarded hot plate with circular line-heat sources is
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2.1 ASTM Standards:
adesigninwhichthemeterandguardplatesarecircularplates
C168 Terminology Relating to Thermal Insulation
having a relatively small number of heaters, each embedded
C177 Test Method for Steady-State Heat Flux Measure-
along a circular path at a fixed radius. In operation, the heat
ments and Thermal Transmission Properties by Means of
from each line-heat source flows radially into the plate and is
the Guarded-Hot-Plate Apparatus
transmitted axially through the test specimens.
C1044 PracticeforUsingaGuarded-Hot-PlateApparatusor
1.3 The meter and guard plates are fabricated from a
Thin-Heater Apparatus in the Single-Sided Mode
continuous piece of thermally conductive material. The plates
E230 Specification and Temperature-Electromotive Force
are made sufficiently thick that, for typical specimen thermal
(EMF) Tables for Standardized Thermocouples
conductances,theradialandaxialtemperaturevariationsinthe
2.2 ASTM Adjuncts:
guarded hot plate are quite small. By proper location of the
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Line-Heat-Source Guarded-Hot-Plate Apparatus
line-heat source(s), the temperature at the edge of the meter
plate can be made equal to the mean temperature of the meter
3. Terminology
plate, thus facilitating temperature measurements and thermal
3.1 Definitions—For definitions of terms and symbols used
guarding.
in this practice, refer to Terminology C168. For definitions of
1.4 The line-heat-source guarded hot plate has been used
terms relating to the guarded-hot-plate apparatus refer to Test
successfully over a mean temperature range from − 10
Method C177.
to+65°C, with circular metal plates and a single line-heat
3.2 Definitions of Terms Specific to This Standard:
source in the meter plate. The chronological development of
3.2.1 gap, n—a separation between the meter plate and
the design of circular line-heat-source guarded hot plates is
guard plate, usually filled with a gas or thermal insulation.
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given in Refs (1-9).
3.2.2 guard plate, n—theouterringoftheguardedhotplate
1.5 This practice does not preclude (1) lower or higher
that encompasses the meter plate and promotes one-
temperatures; (2) plate geometries other than circular; (3)
dimensional heat flow normal to the meter plate.
line-heat-source geometries other than circular; (4) the use of
3.2.3 guarded hot plate, n—an assembly, consisting of a
meter plate and a co-planar, concentric guard plate, that
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provides the heat input to the specimens.
This practice is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement.
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Current edition approved Sept. 1, 2006. Published October 2006. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved 1985. Last previous edition approved in 2002 as C1043–97(2002). DOI: contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
10.1520/C1043-06. Standards volume information, refer to the standard’s Document Summary page on
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The boldface numbers in parentheses refer to a list of references at the end of the ASTM website.
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this practice. Available from ASTM Headquarters. Order Adjunct: ADJC1043.
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C1043–06
3.2.4 line-heat-source, n—a thin or fine electrical heating
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