ASTM C1864-17e1

Standard Test Method for Determination of Solar Reflectance of Directionally Reflective Material Using Portable Solar Reflectometer

SIGNIFICANCE AND USE
5.1 The solar reflectance of a DRM depends on the solar incidence angle. This method is intended to provide solar reflectance values for DRM roofing products.
SCOPE
1.1 This test method covers a technique for determining the solar reflectance of a directionally reflective material using a commercial portable solar reflectometer, including but not limited to roofing materials with granules or surface design that results in angularly dependent reflectance. The purpose of the method is to evaluate the seasonal and annual solar reflectances of a directionally reflective roofing product.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2017
• ICS: 17.180.20 - Colours and measurement of light
• ICS: 27.160 - Solar energy engineering
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.30 - Thermal Measurement

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation:C1864 −17
Standard Test Method for
Determination of Solar Reflectance of Directionally
1
Reflective Material Using Portable Solar Reflectometer
This standard is issued under the fixed designation C1864; 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 (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Corrected 7.2.12 editorially in March 2020.
1. Scope 3.2 Definitions of Terms Specific to This Standard:
3.2.1 directionally reflective material (DRM), n—material
1.1 This test method covers a technique for determining the
with solar reflectance that varies with solar incidence angle.
solar reflectance of a directionally reflective material using a
commercial portable solar reflectometer, including but not 3.3 Symbols:
limitedtoroofingmaterialswithgranulesorsurfacedesignthat 3.3.1 ρ —solar reflectance measured by reflectometer in
J,K
results in angularly dependent reflectance. The purpose of the azimuthal orientation J, within measurement series K.
methodistoevaluatetheseasonalandannualsolarreflectances
3.3.2 ρ —solar reflectance measured by reflectometer in
J
of a directionally reflective roofing product.
azimuthal orientation J, averaged over all measurement repeti-
tions.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Summary of Test Method
standard.
4.1 This method uses a hemispherical solar reflectometer to
1.3 This standard does not purport to address all of the
determine the solar reflectance of a DRM. The reflectometer is
safety concerns, if any, associated with its use. It is the
operated in accordance with Test Method C1549, except that
responsibility of the user of this standard to establish appro-
evaluationofthesurfacefollowstheproceduredescribedin4.2
priate safety, health, and environmental practices and deter-
and 4.3.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
4.2 The solar reflectance of a test specimen is measured 12
dance with internationally recognized principles on standard-
times by rotating the measurement head of the reflectometer in
ization established in the Decision on Principles for the
30° increments about the normal to the test specimen.
Development of International Standards, Guides and Recom-
4.3 The set of 12 measurements is repeated three times to
mendations issued by the World Trade Organization Technical
calculatethesolarreflectanceineachorientationastheaverage
Barriers to Trade (TBT) Committee.
of the three measurements at the same orientation.
2. Referenced Documents
2 5. Significance and Use
2.1 ASTM Standards:
C1549 Test Method for Determination of Solar Reflectance 5.1 The solar reflectance of a DRM depends on the solar
NearAmbientTemperature Using a Portable Solar Reflec- incidence angle. This method is intended to provide solar
tometer reflectance values for DRM roofing products.
3. Terminology
6. Apparatus
3.1 Definitions—The definitions included in Test Method
6.1 This test method employs a portable solar reflectometer
C1549 are applicable to this method.
that is operated in accordance with Test Method C1549.
6.2 The test specimen shall be flat (not curved) and have
1
This test method is under the jurisdiction ofASTM Committee C16 on Thermal
area sufficient to completely cover the measurement port of the
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement. reflectometer.
Current edition approved Sept. 1, 2017. Published September 2017. DOI:
6.3 The test specimen shall be placed at the center of a
10.1520/C1864-17E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or compass pattern marked in 30° increments as shown in Fig. 1.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.4 A vertical indicator arrow, parallel to the central axis of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the reflectometer head and affixed to the outer wall of the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
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C1864−17
FIG. 1Specimen Placed at Center of Compass Pattern
reflectometer head, shall be used to gauge the azimuthal angle
FIG. 2Vertical Indicator Arrow Affixed to Side of Portable Reflec-
of the reflectometer head with respect to the compass mark-
tometer
ings.
7. Procedure
7.2.8 Rest the reflectometer measurement port on the
7.1 Set-Up:
specimen, and record solar reflectance measured in this orien-
7.1.1 Prepare the compass patt
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: C1864 − 17 C1864 − 17
Standard Test Method for
Determination of Solar Reflectance of Directionally
1
Reflective Material Using Portable Solar Reflectometer
This standard is issued under the fixed designation C1864; 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 (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Corrected 7.2.12 editorially in March 2020.
1. Scope
1.1 This test method covers a technique for determining the solar reflectance of a directionally reflective material using a
commercial portable solar reflectometer, including but not limited to roofing materials with granules or surface design that results
in angularly dependent reflectance. The purpose of the method is to evaluate the seasonal and annual solar reflectances of a
directionally reflective roofing product.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C1549 Test Method for Determination of Solar Reflectance Near Ambient Temperature Using a Portable Solar Reflectometer
3. Terminology
3.1 Definitions—The definitions included in Test Method C1549 are applicable to this method.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 directionally reflective material (DRM), n—material with solar reflectance that varies with solar incidence angle.
3.3 Symbols:
3.3.1 ρ —solar reflectance measured by reflectometer in azimuthal orientation J, within measurement series K.
J,K
3.3.2 ρ —solar reflectance measured by reflectometer in azimuthal orientation J, averaged over all measurement repetitions.
J
4. Summary of Test Method
4.1 This method uses a hemispherical solar reflectometer to determine the solar reflectance of a DRM. The reflectometer is
operated in accordance with Test Method C1549, except that evaluation of the surface follows the procedure described in 4.2 and
4.3.
4.2 The solar reflectance of a test specimen is measured 12 times by rotating the measurement head of the reflectometer in 30°
increments about the normal to the test specimen.
4.3 The set of 12 measurements is repeated three times to calculate the solar reflectance in each orientation as the average of
the three measurements at the same orientation.
1
This test method is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement.
Current edition approved Sept. 1, 2017. Published September 2017. DOI: 10.1520/C1864-17.10.1520/C1864-17E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
´1
C1864 − 17
5. Significance and Use
5.1 The solar reflectance of a DRM depends on the solar incidence angle. This method is intended to provide solar reflectance
values for DRM roofing products.
6. Apparatus
6.1 This test method employs a portable solar reflectometer that is operated in accordance with Test Method C1549.
6.2 The test specimen shall be flat (not curved) and have area sufficient to completely cover the measurement port of the
reflectometer.
6.3 The test specimen shall be placed at the center of a compass pattern marked in 30° increments as shown in Fig. 1.
6.4 A vertical indicator arrow, parallel to the central axis of the reflectometer head and affixed to the outer wall of the
reflectometer head, shall be used to gauge the azimuthal angle of the reflectometer hea
...