ASTM C1371-04a

Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers

SCOPE
1.1 This test method covers a technique for determination of the emittance of typical materials using a portable differential thermopile emissometer. The purpose of the test method is to provide a comparative means of quantifying the emittance of opaque, highly thermally conductive materials near room temperature as a parameter in evaluating temperatures, heat flows, and derived thermal resistances of materials.
1.2 This test method does not supplant Test Method C 835, which is an absolute method for determination of total hemispherical emittance, or Test Method E 408, which includes two comparative methods for determination of total normal emittance. Because of the unique construction of the portable emissometer, it can be calibrated to measure the total hemispherical emittance. This is supported by comparison of emissometer measurements with those of Test Method C 835 (1).
1.3 This standard does not purport to address all of the safety concerns, 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2004
• ICS: 17.200.10 - Heat. Calorimetry
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.30 - Thermal Measurement

Relations

• Replaces: ASTM C1371-04 - Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers
• Effective Date: 01-Sep-2004
• Replaced By: ASTM C1371-04a(2010)e1 - Standard Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers
• Effective Date: 01-Nov-2010
• Referred By: ASTM C1729M-21 - Standard Specification for Aluminum Jacketing for Insulation
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1224-22 - Standard Specification for Reflective Insulation for Building Applications
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1767M-21 - Standard Specification for Stainless Steel Jacketing for Insulation
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1363-19 - Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1313/C1313M-13(2019) - Standard Specification for Sheet Radiant Barriers for Building Construction Applications
• Effective Date: 01-Sep-2004
• Referred By: ASTM E2813-18 - Standard Practice for Building Enclosure Commissioning
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1775-22 - Standard Specification for Laminate Protective Jacket and Tape for Use over Thermal Insulation for Outdoor Applications
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1321-15(2020) - Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction
• Effective Date: 01-Sep-2004
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1916-21 - Standard Specification for Flexible Protective Jackets Made of Modified Asphalt/Butyl Rubber for Use over Thermal Insulation
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1668-20 - Standard Specification for Externally Applied Reflective Insulation Systems on Rigid Duct in Heating, Ventilation, and Air Conditioning (HVAC) Systems
• Effective Date: 01-Sep-2004
• Referred By: ASTM C667-17(2022) - Standard Specification for Prefabricated Reflective Insulation Systems for Equipment and Pipe Operating at Temperatures above Ambient Air
• Effective Date: 01-Sep-2004
• Referred By: ASTM C1841-23 - Standard Specification for Interior Radiation Control Coating (IRCC) for Building Applications
• Effective Date: 01-Sep-2004

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:C1371–04a
Standard Test Method for
Determination of Emittance of Materials Near Room
1
Temperature Using Portable Emissometers
This standard is issued under the fixed designation C1371; 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 E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.1 Thistestmethodcoversatechniquefordeterminationof
E408 Test Methods forTotal Normal Emittance of Surfaces
the emittance of typical materials using a portable differential
Using Inspection-Meter Techniques
thermopile emissometer. The purpose of the test method is to
E691 Practice for Conducting an Interlaboratory Study to
provide a comparative means of quantifying the emittance of
Determine the Precision of a Test Method
opaque, highly thermally conductive materials near room
temperature as a parameter in evaluating temperatures, heat
3. Terminology
flows, and derived thermal resistances of materials.
3.1 Definitions—For definitions of some terms used in this
1.2 This test method does not supplant Test Method C835,
test method, refer to Terminology C168.
which is an absolute method for determination of total hemi-
3.2 Definitions of Terms Specific to This Standard:
spherical emittance, orTest Method E408, which includes two
3.2.1 diffuse surface—a surface that emits or reflects equal
comparative methods for determination of total normal emit-
radiation intensity, or both, into all directions (2).
tance. Because of the unique construction of the portable
3.2.2 emissive power—therateofradiativeenergyemission
emissometer, it can be calibrated to measure the total hemi-
per unit area from a surface (2).
spherical emittance. This is supported by comparison of
3.2.3 emissometer—an instrument used for measurement of
emissometer measurements with those of Test Method C835
2 emittance.
(1).
3.2.4 Lambert’s cosine law—the mathematical relation de-
1.3 This standard does not purport to address all of the
scribing the variation of emissive power from a diffuse surface
safety concerns, if any, associated with its use. It is the
asvaryingwiththecosineoftheanglemeasuredawayfromthe
responsibility of the user of this standard to establish appro-
normal of the surface (2).
priate safety and health practices and determine the applica-
3.2.5 normal emittance—the directional emittance perpen-
bility of regulatory limitations prior to use.
dicular to the surface.
2. Referenced Documents 3.2.6 radiative intensity—radiative energy passing through
3
an area per unit solid angle, per unit of the area projected
2.1 ASTM Standards:
normal to the direction of passage, and per unit time (2).
C168 Terminology Relating to Thermal Insulation
3.2.7 spectral—having a dependence on wavelength; radia-
C680 PracticeforEstimateoftheHeatGainorLossandthe
tion within a narrow region of wavelength (2).
Surface Temperatures of Insulated Flat, Cylindrical, and
3.2.8 specular surface—mirrorlike in reflection behavior
Spherical Systems by Use of Computer Programs
(2).
C835 Test Method for Total Hemispherical Emittance of
3.3 Symbols:
Surfaces up to 1400°C
3.3.1 For standard symbols used in this test method, see
Terminology C168. Additional symbols are listed here:
a=total absorptance, dimensionless
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal
a =spectral absorptance, dimensionless
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal l
Measurement. ´ =total emittance of the high-emittance calibration stan-
hi
Current edition approved Sept. 1, 2004. Published September 2004. Originally
dard, dimensionless
approved in 1997. Last previous edition approved in 2004 as C1371-04. DOI:
´ =total emittance of the low-emittance calibration stan-
low
10.1520/C1371-04A.
2
dard, dimensionless
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
this standard.
´ =apparent total emittance of the test specimen, dimen-
spec
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sionless
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
´=apparent total emittance of the surface, dimensionless
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ´ =apparenttotalemittanceofthesurface1,dimensionless
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C1371–04a
NOTE 1—(a) Emissometer measuring head on high-emittance standard during calibration, showing heat sink and cable to readou
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