ASTM G90-10

Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight

SIGNIFICANCE AND USE
Results obtained from this practice can be used to compare the relative durability of materials subjected to the specific test cycle used. No accelerated exposure test can be specified as a total simulation of natural or field exposures. Results obtained from this practice can be considered as representative of natural or field exposures only when the degree of comparative performance has been established for the specific materials being tested.
The relative durability of materials in natural or field exposure can be very different depending on the location of the exposure because of differences in UV radiation, time of wetness, temperature, pollutants, and other factors. Therefore, even if results from a specific accelerated test condition are found to be useful for comparing the relative durability of materials exposed in a particular exterior location, it cannot be assumed that they will be useful for determining relative durability for a different location.
The use of a single acceleration factor relating the rate of degradation in this accelerated exposure to the rate of degradation in a conventional exterior exposure is not recommended because the acceleration factor varies with the type and formulation of the material. Each material and formulation may respond differently to the increased level of irradiance and differences in temperature and humidity. Thus an acceleration factor determined for one material may not be applicable to other materials. Because of variability in test results under both accelerated and conventional exterior exposures results from a sufficient number of tests must be obtained to determine an acceleration factor for a material. Further, the acceleration factor is applicable to only one exterior exposure location because results from conventional exterior exposures can vary due to seasonal or annual differences in important climatic factors.
Variations in results may be expected when operating conditions vary within the limits o...
SCOPE
1.1 Fresnel-reflecting concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of nonmetallic materials.
1.2 This practice covers a procedure for performing accelerated outdoor exposure testing of nonmetallic materials using a Fresnel-reflector accelerated outdoor weathering test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described herein to minimize the variables encountered during outdoor accelerated exposure testing.
1.3 This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method of obtaining, measuring, and controlling the procedures and certain conditions of the exposure. Sample preparation, test conditions, and evaluation of results are covered in existing methods or specifications for specific materials.
1.4 The Fresnel-reflector accelerated outdoor exposure test machines described may be suitable for the determination of the relative durability of materials exposed to sunlight, heat, and moisture, provided the mechanisms of chemical or physical change, or both, which control the rates of acceleration factors for the materials do not differ significantly.
1.5 This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are standard provisions for maintenance of the machine and Fresnel-reflector mirrors to ensure cleanliness and durability.
1.6 This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.
1.7 For test machines currently in use, this practice may not apply to specimens exceeding 13 mm (1/2 in.) in thickness because cooling may be questionable.
1.8 Values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are provided for information only.
1.9 This standard does not purport to address all of the safety concerns, if ...

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 19.040 - Environmental testing
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.02 - Natural and Environmental Exposure Tests

Relations

• Replaces: ASTM G90-05 - Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight
• Effective Date: 01-Jun-2010
• Referred By: ASTM G156-17 - Standard Practice for Selecting and Characterizing Weathering Reference Materials
• Effective Date: 01-Jun-2010
• Referred By: ASTM G147-17 - Standard Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
• Effective Date: 01-Jun-2010
• Referred By: ASTM D5105-05(2019) - Standard Practice for Performing Accelerated Outdoor Weathering of Pressure-Sensitive Tapes Using Concentrated Natural Sunlight
• Effective Date: 01-Jun-2010
• Referred By: ASTM G113-22 - Standard Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
• Effective Date: 01-Jun-2010
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 01-Jun-2010
• Referred By: ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
• Effective Date: 01-Jun-2010
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 01-Jun-2010
• Referred By: ASTM F1164-19 - Standard Test Method for Evaluation of Transparent Plastics Exposed to Accelerated Weathering Combined with Biaxial Stress
• Effective Date: 01-Jun-2010
• Referred By: ASTM E816-15(2023) - Standard Test Method for Calibration of Pyrheliometers by Comparison to Reference Pyrheliometers
• Effective Date: 01-Jun-2010
• Referred By: ASTM D4364-13(2022)e1 - Standard Practice for Performing Outdoor Accelerated Weathering Tests of Plastics Using Concentrated Sunlight
• Effective Date: 01-Jun-2010
• Referred By: ASTM D4141/D4141M-22 - Standard Practice for Conducting Black Box and Solar Concentrating Exposures of Coatings
• Effective Date: 01-Jun-2010
• Referred By: ASTM D5722-20 - Standard Practice for Performing Accelerated Outdoor Weathering of Factory-Coated Embossed Hardboard Using Concentrated Natural Sunlight and a Soak-Freeze-Thaw Procedure
• Effective Date: 01-Jun-2010
• Referred By: ASTM G178-16(2023) - Standard Practice for Determining the Activation Spectrum of a Material (Wavelength Sensitivity to an Exposure Source) Using the Sharp Cut-On Filter or Spectrographic Technique
• Effective Date: 01-Jun-2010
• Referred By: ASTM G183-15(2023) - Standard Practice for Field Use of Pyranometers, Pyrheliometers and UV Radiometers
• Effective Date: 01-Jun-2010

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:G90 −10
Standard Practice for
Performing Accelerated Outdoor Weathering of Nonmetallic
1
Materials Using Concentrated Natural Sunlight
This standard is issued under the fixed designation G90; 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.
1. Scope 1.8 Values stated in SI units are to be regarded as the
standard. The inch-pound units in parentheses are provided for
1.1 Fresnel-reflecting concentrators using the sun as source
information only.
are utilized in the accelerated outdoor exposure testing of
1.9 This standard does not purport to address all of the
nonmetallic materials.
safety concerns, if any, associated with its use. It is the
1.2 This practice covers a procedure for performing accel-
responsibility of the user of this standard to establish appro-
erated outdoor exposure testing of nonmetallic materials using
priate safety and health practices and determine the applica-
a Fresnel-reflector accelerated outdoor weathering test ma-
bility of regulatory limitations prior to use.
chine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are
described herein to minimize the variables encountered during
2. Referenced Documents
outdoor accelerated exposure testing.
2
2.1 ASTM Standards:
1.3 This practice does not specify the exposure conditions
D859 Test Method for Silica in Water
best suited for the materials to be tested but is limited to the
D1014 Practice for Conducting Exterior Exposure Tests of
method of obtaining, measuring, and controlling the proce-
Paints and Coatings on Metal Substrates
dures and certain conditions of the exposure. Sample
D1435 Practice for Outdoor Weathering of Plastics
3
preparation, test conditions, and evaluation of results are
D1898 Practice for Sampling of Plastics (Withdrawn 1998)
covered in existing methods or specifications for specific
D4141 Practice for Conducting Black Box and Solar Con-
materials.
centrating Exposures of Coatings
D4517 Test Method for Low-Level Total Silica in High-
1.4 The Fresnel-reflector accelerated outdoor exposure test
Purity Water by Flameless Atomic Absorption Spectros-
machines described may be suitable for the determination of
copy
the relative durability of materials exposed to sunlight, heat,
E816 Test Method for Calibration of Pyrheliometers by
and moisture, provided the mechanisms of chemical or physi-
Comparison to Reference Pyrheliometers
cal change, or both, which control the rates of acceleration
E824 Test Method for Transfer of Calibration From Refer-
factors for the materials do not differ significantly.
ence to Field Radiometers
1.5 This practice establishes uniform sample mounting and E903 Test Method for Solar Absorptance, Reflectance, and
in-test maintenance procedures. Also included in the practice
Transmittance of Materials Using Integrating Spheres
are standard provisions for maintenance of the machine and G7 Practice for Atmospheric Environmental Exposure Test-
Fresnel-reflector mirrors to ensure cleanliness and durability.
ing of Nonmetallic Materials
G24 Practice for Conducting Exposures to Daylight Filtered
1.6 This practice shall apply to specimens whose size meets
Through Glass
the dimensions of the target board as described in 8.2.
G113 Terminology Relating to Natural andArtificial Weath-
1.7 For test machines currently in use, this practice may not
ering Tests of Nonmetallic Materials
1
apply to specimens exceeding 13 mm ( ⁄2 in.) in thickness G167 Test Method for Calibration of a Pyranometer Using a
because cooling may be questionable.
Pyrheliometer
1 2
This practice is under the jurisdiction ofASTM Committee G03 on Weathering For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Durabilityand is the direct responsibility of Subcommittee G03.02 on Natural contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
and Environmental Exposure Tests. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2010. Published June 2010. Originally the ASTM website.
3
approved in 1985. Last previous edition approved in 2005 as G90 – 05. DOI: The last approved version of this historical standard is referenced on
10.1520/G0090-10. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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G90−10
FIG. 1Schematic of Fresnel-Reflecting Concentrator Accelerated Weathering Machine Single Axis Tracking
G169 Guide for Application of Basic Statistical Methods to 4. Significance and Use
Weathering Tests
...

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:G90–05 Designation: G90 – 10
Standard Practice for
Performing Accelerated Outdoor Weathering of Nonmetallic
1
Materials Using Concentrated Natural Sunlight
This standard is issued under the fixed designation G90; 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.
1. Scope
1.1 Fresnel-reflecting concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of
nonmetallic materials.
1.2 This practice covers a procedure for performing accelerated outdoor exposure testing of nonmetallic materials using a
Fresnel-reflector accelerated outdoor weathering test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described
herein to minimize the variables encountered during outdoor accelerated exposure testing.
1.3 This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method
ofobtaining,measuring,andcontrollingtheproceduresandcertainconditionsoftheexposure.Samplepreparation,testconditions,
and evaluation of results are covered in existing methods or specifications for specific materials.
1.4 The Fresnel-reflector accelerated outdoor exposure test machines described may be suitable for the determination of the
relative durability of materials exposed to sunlight, heat, and moisture, provided the mechanisms of chemical or physical change,
or both, which control the rates of acceleration factors for the materials do not differ significantly.
1.5 This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are
standard provisions for maintenance of the machine and Fresnel-reflector mirrors to ensure cleanliness and durability.
1.6 This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.
1
1.7 For test machines currently in use, this practice may not apply to specimens exceeding 13 mm ( ⁄2 in.) in thickness because
cooling may be questionable.
1.8 ValuesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsinparenthesesareprovidedforinformation
only.
1.9 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D859 Test Method for Silica in Water
D1014 Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
D1435 Practice for Outdoor Weathering of Plastics
3
D1898 Practice for Sampling of Plastics
D4141 Practice for Conducting Black Box and Solar Concentrating Exposures of Coatings
D4517 Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
E816 Test Method for Calibration of Pyrheliometers by Comparison to Reference Pyrheliometers
E824 Test Method for Transfer of Calibration From Reference to Field Radiometers E891Tables for Terrestrial Direct Normal
Solar Spectral Irradiance for Air Mass
0
1.5
E903 Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres
G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
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 Oct.June 1, 2005.2010. Published November 2005.June 2010. Originally approved in 1985. Last previous edition approved in 19982005 as
G90–98.G90 – 05. DOI: 10.1520/G0090-105.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
3
Withdrawn. The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
G90–10
FIG. 1 Schematic of Fresnel-Reflecting Concentrator Accelerated Weathering Machine
...