ASTM G201-23
(Practice)Standard Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation
Standard Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation
SIGNIFICANCE AND USE
5.1 As with any accelerated test, the increase in rate of weathering compared to in-service exposure is material dependent. Results from exposures conducted to this practice may provide good rank correlation to results from actual use conditions for one type of material or product. It should not be assumed that this will be true for other materials or products. It is always best to verify the ability of an accelerated exposure test to properly rank the durability of materials with actual use conditions. Guide G141 provides information about using rank correlation.
5.2 Variation in results may be expected when operating conditions are varied within the accepted limits of this practice. Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the specific operating conditions in conformance with Report Section 8.
5.3 The durability of materials in outdoor use can be very different depending on the location of the exposure because of differences in solar radiation, moisture, heat, pollutants, and other factors. Therefore, it cannot be assumed that results from exposure in a single location will be useful for determining durability ranking of materials in a different location.
5.4 It is recommended that at least one control material be exposed with each test. The control material should be of similar composition and construction and be chosen so that its failure modes are the same as that of the material being tested. It is preferable to use two control materials, one with relatively good durability, and one with relatively poor durability. If control materials are included as part of the test, they shall be used for the purpose of comparing the performance of the test materials relative to the controls.
SCOPE
1.1 This practice covers the basic principles and operating procedures for using outdoor glass-covered exposure apparatus with air circulation. This practice is limited to the procedures for obtaining, measuring and controlling conditions of exposure. A number of exposure procedures are listed in Appendix X1; however, this practice does not specify the exposure conditions best suited for the material to be tested.
1.2 For direct weathering exposures, refer to Practice G7. For exposures behind glass without air circulation, refer to Practice G24.
1.3 Test specimens are exposed to solar radiation filtered through glass under partially controlled environmental test conditions. Different glass types and operating parameters are described.
1.4 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. More specific information for determining the change in properties after exposure and reporting these results is described in Practices D5870, D2244 and Test Method D523.
1.5 The values stated in SI units are to be regarded as standard.
1.6 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.
1.7 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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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.
Designation: G201 − 23
Standard Practice for
Conducting Exposures in Outdoor Glass-Covered Exposure
1
Apparatus with Air Circulation
This standard is issued under the fixed designation G201; 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. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This practice covers the basic principles and operating
procedures for using outdoor glass-covered exposure apparatus
2. Referenced Documents
with air circulation. This practice is limited to the procedures
2
2.1 ASTM Standards:
for obtaining, measuring and controlling conditions of expo-
D523 Test Method for Specular Gloss
sure. A number of exposure procedures are listed in Appendix
D2244 Practice for Calculation of Color Tolerances and
X1; however, this practice does not specify the exposure
Color Differences from Instrumentally Measured Color
conditions best suited for the material to be tested.
Coordinates
1.2 For direct weathering exposures, refer to Practice G7.
D5870 Practice for Calculating Property Retention Index of
For exposures behind glass without air circulation, refer to
Plastics
Practice G24.
E903 Test Method for Solar Absorptance, Reflectance, and
1.3 Test specimens are exposed to solar radiation filtered
Transmittance of Materials Using Integrating Spheres
through glass under partially controlled environmental test
E1084 Test Method for Solar Transmittance (Terrestrial) of
conditions. Different glass types and operating parameters are
Sheet Materials Using Sunlight
described.
G7 Practice for Natural Weathering of Materials
G24 Practice for Conducting Exposures to Daylight Filtered
1.4 Specimen preparation and evaluation of the results are
Through Glass
covered in ASTM methods or specifications for specific
G113 Terminology Relating to Natural and Artificial Weath-
materials. More specific information for determining the
ering Tests of Nonmetallic Materials
change in properties after exposure and reporting these results
G141 Guide for Addressing Variability in Exposure Testing
is described in Practices D5870, D2244 and Test Method
of Nonmetallic Materials
D523.
G173 Tables for Reference Solar Spectral Irradiances: Direct
1.5 The values stated in SI units are to be regarded as
Normal and Hemispherical on 37° Tilted Surface
standard.
G177 Tables for Reference Solar Ultraviolet Spectral Distri-
1.6 This standard does not purport to address all of the
butions: Hemispherical on 37° Tilted Surface
safety concerns, if any, associated with its use. It is the
G179 Specification for Metal Black Panel and White Panel
responsibility of the user of this standard to establish appro-
Temperature Devices for Natural Weathering Tests
priate safety, health, and environmental practices and deter-
G183 Practice for Field Use of Pyranometers, Pyrheliom-
mine the applicability of regulatory limitations prior to use.
eters and UV Radiometers
1.7 This international standard was developed in accor-
3
2.2 Other Documents:
dance with internationally recognized principles on standard-
WMO No. 8 Guide to Meteorological Instruments and
ization established in the Decision on Principles for the
Methods of Observation, Fifth Edition
Development of International Standards, Guides and Recom-
1 2
This practice is under the jurisdiction of ASTM Committee G03 on Weathering For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Durability and is the direct responsibility of Subcommittee G03.02 on Natural contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and Environmental Exposure Tests. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2023. Published January 2024. Originally the ASTM website.
3
approved in 2009. Last previous edition approved in 2016 as G201 – 16. DOI: Available from World Meteorological Organization (WMO), 7bis, avenue de la
10.1520/G0201-23. Paix, Case postale 2300, CH-1211 Geneva 2, Switzerland, http://www.wmo.int.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G201 − 23
GMW3417 Natural Weathering Exposure Tests for Interior 5.4 It is recommended that at least one control material be
Trims/Materials exposed with each test. The control material should be of
4
similar composition a
...
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.
Designation: G201 − 16 G201 − 23
Standard Practice for
Conducting Exposures in Outdoor Glass-Covered Exposure
1
Apparatus with Air Circulation
This standard is issued under the fixed designation G201; 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. Scope
1.1 This practice covers the basic principles and operating procedures for using outdoor glass-covered exposure apparatus with
air circulation. This practice is limited to the procedures for obtaining, measuring and controlling conditions of exposure. A number
of exposure procedures are listed in Appendix X1; however, this practice does not specify the exposure conditions best suited for
the material to be tested.
1.2 For direct weathering exposures, refer to Practice G7. For exposures behind glass without air circulation, refer to Practice G24.
1.3 Test specimens are exposed to solar radiation filtered through glass under partially controlled environmental test conditions.
Different glass types and operating parameters are described.
1.4 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. More
specific information for determining the change in properties after exposure and reporting these results is described in Practices
D5870, D2244 and Test Method D523.
1.5 The values stated in SI units are to be regarded as standard.
1.6 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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.7 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:
D523 Test Method for Specular Gloss
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
D5870 Practice for Calculating Property Retention Index of Plastics
E903 Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres
1
This practice is under the jurisdiction of ASTM Committee G03 on Weathering and Durability and is the direct responsibility of Subcommittee G03.02 on Natural and
Environmental Exposure Tests.
Current edition approved Feb. 1, 2016Dec. 1, 2023. Published February 2016January 2024. Originally approved in 2009. Last previous edition approved in 20092016 as
G201 – 09. DOI: 10.1520/G0201-16.16. DOI: 10.1520/G0201-23.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G201 − 23
E1084 Test Method for Solar Transmittance (Terrestrial) of Sheet Materials Using Sunlight
G7 Practice for Natural Weathering of Materials
G24 Practice for Conducting Exposures to Daylight Filtered Through Glass
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G141 Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials
G173 Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37° Tilted Surface
G177 Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface
G179 Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests
G183 Practice for Field Use of Pyranometers, Pyrheliometers and UV Radiometers
3
2.2 Other Document:Documents:
WMO No. 8 Guide to Meteorological Instruments and Methods of Observation, Fifth Edition
GM 9538PGMW3417 Natural Weathering Exposure Tests for Interior TrimsTrims/Materials
4
2.3 ISO Standard:
ISO 9060 Solar energy — Specification and classification of instrume
...
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