ASTM D4674-19
(Practice)Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments
Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments
SIGNIFICANCE AND USE
5.1 Tests conducted in accordance with this practice are intended to induce property changes associated with use exposure to light and heat in typical office environments. These exposures are not intended to simulate the deterioration caused by localized phenomena such as handling, dirt contamination, etc.
Note 5: Caution: Refer to practice G151 for full cautionary guidance applicable to all laboratory weathering devices. Additional information on sources of variability and on strategies for addressing variability by design and data analysis of laboratory accelerated exposure tests is found in Guide G141.
5.2 Variation in results may be expected are possible between the different methods described in this practice. For example, differences in spectral distribution of the lamps used and variations in the irradiance for a single type of lamp can cause significant differences in test results. Therefore, any no reference to the use of this practice should be made unless accompanied by a report prepared in accordance with Section 12 that describes needs to include a reference to the method used.
5.3 Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control. Therefore, exposure of a similar material of known performance (a control) at the same time as the test materials is strongly recommended. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.
SCOPE
1.1 This practice covers the basic principles and operating procedures for using fluorescent light to determine color stability of plastics when materials are exposed in typical office environments where fluorescent overhead lighting and window-filtered daylight are used for illumination and where temperature and humidity conditions are in accordance with American Society of Heating, Refrigerating, and Air-conditioning Engineers (ASHRAE) recommendations for workers' comfort.
1.2 This practice describes four methods where specimens are exposed to fluorescent light under controlled environmental conditions. Two of the methods use an exposure device that provides for mixing of fluorescent lamps and two of the methods use devices that comply with Practice G154.
Note 1: Method I uses cool white fluorescent lamps and window glass filtered fluorescent UVB lamps and is the same method described in previous versions of this standard.
1.3 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151. More specific information about methods for determining the change in properties after exposure and reporting these results is described in Practice D5870.
1.4 The values stated in SI units are to be regarded as the standard.
1.5 Unless otherwise specified, all dimensions are nominal.
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. Specific precautionary statements are given in Section 7.
Note 2: There is no known ISO equivalent to this standard.
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.
General Information
Relations
Standards Content (Sample)
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: D4674 − 19
Standard Practice for
Accelerated Testing for Color Stability of Plastics Exposed
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to Indoor Office Environments
This standard is issued under the fixed designation D4674; 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 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This practice covers the basic principles and operating
ization established in the Decision on Principles for the
procedures for using fluorescent light to determine color
Development of International Standards, Guides and Recom-
stabilityofplasticswhenmaterialsareexposedintypicaloffice
mendations issued by the World Trade Organization Technical
environments where fluorescent overhead lighting and
Barriers to Trade (TBT) Committee.
window-filtered daylight are used for illumination and where
temperature and humidity conditions are in accordance with
2. Referenced Documents
American Society of Heating, Refrigerating, and Air-
2
2.1 ASTM Standards:
conditioning Engineers (ASHRAE) recommendations for
D1729 Practice for Visual Appraisal of Colors and Color
workers’ comfort.
Differences of Diffusely-Illuminated Opaque Materials
1.2 This practice describes four methods where specimens
D2244 Practice for Calculation of Color Tolerances and
areexposedtofluorescentlightundercontrolledenvironmental
Color Differences from Instrumentally Measured Color
conditions. Two of the methods use an exposure device that
Coordinates
provides for mixing of fluorescent lamps and two of the
D3980 Practice for Interlaboratory Testing of Paint and
methods use devices that comply with Practice G154.
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Related Materials (Withdrawn 1998)
NOTE 1—Method I uses cool white fluorescent lamps and window glass D5870 Practice for Calculating Property Retention Index of
filtered fluorescent UVB lamps and is the same method described in
Plastics
previous versions of this standard.
E691 Practice for Conducting an Interlaboratory Study to
1.3 Specimen preparation and evaluation of the results are
Determine the Precision of a Test Method
covered in ASTM methods or specifications for specific
G113 Terminology Relating to Natural andArtificial Weath-
materials. General guidance is given in Practice G151. More
ering Tests of Nonmetallic Materials
specific information about methods for determining the change
G141 Guide for Addressing Variability in Exposure Testing
in properties after exposure and reporting these results is
of Nonmetallic Materials
described in Practice D5870.
G147 Practice for Conditioning and Handling of Nonmetal-
lic Materials for Natural and Artificial Weathering Tests
1.4 The values stated in SI units are to be regarded as the
G151 Practice for Exposing Nonmetallic Materials inAccel-
standard.
erated Test Devices that Use Laboratory Light Sources
1.5 Unless otherwise specified, all dimensions are nominal.
G154 Practice for Operating Fluorescent Ultraviolet (UV)
1.6 This standard does not purport to address all of the
Lamp Apparatus for Exposure of Nonmetallic Materials
safety concerns, if any, associated with its use. It is the
G169 Guide for Application of Basic Statistical Methods to
responsibility of the user of this standard to establish appro-
Weathering Tests
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
Specific precautionary statements are given in Section 7.
3.1 Definitions—ThedefinitionsgiveninTerminologyG113
are applicable to this practice.
NOTE 2—There is no known ISO equivalent to this standard.
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ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is the direct responsibility of Subcommittee D20.50 on Durability of Plastics. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved April 15, 2019. Published May 2019. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1987. Last previous edition approved in 2010 as D4674 - 02a(2010), the ASTM website.
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which was withdrawn January 2019 and reinstated in April 2019. DOI: 10.1520/ The last approved version of this historical standard is referenced on
D4674-19. www.astm.org.
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