ASTM G7-05

Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials

SCOPE
1.1 This practice covers procedures to be followed for direct exposure of nonmetallic materials to the environment. When originators of a weathering test have the actual exposure conducted by a separate agency, the specific conditions for the exposure of test and control specimens should be clearly defined and mutually agreed upon between all parties.  
1.2 For exposures behind glass, refer to Practice G 24.  
1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.  
1.4 This practice is technically equivalent to the parts of ISO 877 that describe direct exposures of specimens to the environment.  
1.5 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-Dec-2004
• ICS: 19.040 - Environmental testing
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.02 - Natural and Environmental Exposure Tests

Relations

• Replaces: ASTM G7-97 - Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
• Effective Date: 01-Jan-2005
• Replaced By: ASTM G7/G7M-11 - Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
• Effective Date: 01-Jun-2011
• Referred By: ASTM D6675-23 - Standard Practice for Salt-Accelerated Outdoor Cosmetic Corrosion Testing of Organic Coatings on Automotive Sheet Steel
• Effective Date: 01-Jan-2005
• Referred By: ASTM D2485-22 - Standard Test Methods for Evaluating Coatings For High Temperature Service
• Effective Date: 01-Jan-2005
• Referred By: ASTM D6578/D6578M-13(2018) - Standard Practice for Determination of Graffiti Resistance
• Effective Date: 01-Jan-2005
• Referred By: ASTM D1014-18 - Standard Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
• Effective Date: 01-Jan-2005
• Referred By: ASTM D4141/D4141M-22 - Standard Practice for Conducting Black Box and Solar Concentrating Exposures of Coatings
• Effective Date: 01-Jan-2005
• Referred By: ASTM G11-19 - Standard Practice for Effects of Outdoor Weathering on Pipeline Coatings
• Effective Date: 01-Jan-2005
• Referred By: ASTM G90-23 - Standard Practice for Performing Accelerated Outdoor Weathering of Materials Using Concentrated Natural Sunlight
• Effective Date: 01-Jan-2005
• Referred By: ASTM D1435-20 - Standard Practice for Outdoor Weathering of Plastics
• Effective Date: 01-Jan-2005
• Referred By: ASTM G24-21 - Standard Practice for Conducting Exposures to Daylight Filtered Through Glass
• Effective Date: 01-Jan-2005
• Referred By: ASTM D3274-09(2021) - Standard Test Method for Evaluating Degree of Surface Disfigurement of Paint Films by Fungal or Algal Growth, or Soil and Dirt Accumulation
• Effective Date: 01-Jan-2005
• Referred By: ASTM D7376-10a(2022) - Standard Practice for Outdoor Evaluation of Wet Stack Storage Conditions on Coil-Coated Metals
• Effective Date: 01-Jan-2005
• Referred By: ASTM G179-04(2019) - Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests
• Effective Date: 01-Jan-2005
• Referred By: ASTM C1589/C1589M-18(2023) - Standard Practice for Outdoor Weathering of Construction Seals and Sealants
• Effective Date: 01-Jan-2005

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:G7–05
Standard Practice for
Atmospheric Environmental Exposure Testing of
1
Nonmetallic Materials
This standard is issued under the fixed designation G7; 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.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope G113 TerminologyRelatingtoNaturalandArtificialWeath-
ering Tests of Nonmetallic Materials
1.1 Thispracticecoversprocedurestobefollowedfordirect
G130 Test Method for Calibration of Narrow- and Broad-
exposure of nonmetallic materials to the environment. When
Band Ultraviolet Radiometers Using a Spectroradiometer
originators of a weathering test have the actual exposure
2.2 ISO Standards:
conducted by a separate agency, the specific conditions for the
ISO 877 Plastics—Methods of Exposure to Direct Weather-
exposure of test and control specimens must be clearly defined
ing; to Weathering Using Glass-Filtered Daylight, and to
and mutually agreed upon between all parties.
Intensified Weathering by Daylight Using Fresnel Mir-
1.2 For exposures behind glass, refer to Practice G24.
4
rors
1.3 The values stated in SI units are to be regarded as the
ISO 9370 Plastics—Instrumental Determination of Radiant
standard. The inch-pound units given in parentheses are for
Exposure in Weathering Tests—General Guidance and
information only.
4
Basic Test Method
1.4 This practice is technically equivalent to the parts of
2.3 ASTM Adjuncts:
ISO 877 that describe direct exposures of specimens to the
5
A Test Rack
environment.
1.5 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—The definitions given in Terminology E41
responsibility of the user of this standard to establish appro-
and Terminology G113 are applicable to this practice.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Significance and Use
4.1 The relative durability of materials in natural exposures
2. Referenced Documents
2 can be very different depending on the location of the exposure
2.1 ASTM Standards:
because of differences in ultraviolet (UV) radiation, time of
E41 Terminology Relating To Conditioning
wetness, temperature, pollutants, and other factors. Therefore,
E824 Test Method for Transfer of Calibration From Refer-
it cannot be assumed that results from one exposure in a single
ence to Field Radiometers
location will be useful for determining relative durability in a
E913 Method for Calibration of Reference Pyranometers
3 different location. Exposures in several locations with different
With Axis Vertical by the Shading Method
climates which represent a broad range of anticipated service
E941 Test Method for Calibration of Reference Pyranom-
3 conditions are recommended.
eters With Axis Tilted by the Shading Method
4.2 Because of year-to-year climatological variations, re-
G24 PracticeforConductingExposurestoDaylightFiltered
sults from a single exposure test cannot be used to predict the
Through Glass
absolute rate at which a material degrades. Several years of
repeat exposures are needed to get an “average” test result for
1
This practice is under the jurisdiction ofASTM Committee G03 onWeathering
a given location.
and Durability and is the direct responsibility of Subcommittee G03.02 on Natural
4.3 Solar ultraviolet radiation varies considerably as a
and Environmental Exposure Tests.
function of time of year.This can cause large differences in the
Current edition approved Jan. 1, 2005. Published February 2005. Originally
approved in 1969. Last previous edition approved in 1997 as G7 – 97. DOI:
apparent rate of degradation in many polymers. Comparing
10.1520/G0007-05.
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
4
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
3 5
Withdrawn. The last approved version of this historical standard is referenced Detailed drawings for an acceptable test rack may be obtained from ASTM
on www.astm.org. International. Request ADJG0007.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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G7–05
results for materials exposed for short periods (less than one be used for the purpose
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