ASTM_D_4674_-_19.pdf

Designation:D467419Standard Practice forAccelerated Testing for Color Stability of Plastics Exposedto Indoor Office Environments1This standard is issued under the fixed designation D4674;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the basic principles and operatingprocedures for using fluorescent light to determine colorstability of plastics when materials are exposed in typical officeenvironments where fluorescent overhead lighting andwindow-filtered daylight are used for illumination and wheretemperature and humidity conditions are in accordance withAmerican Society of Heating,Refrigerating,and Air-conditioning Engineers(ASHRAE)recommendations forworkers comfort.1.2 This practice describes four methods where specimensare exposed to fluorescent light under controlled environmentalconditions.Two of the methods use an exposure device thatprovides for mixing of fluorescent lamps and two of themethods use devices that comply with Practice G154.NOTE1Method I uses cool white fluorescent lamps and window glassfiltered fluorescent UVB lamps and is the same method described inprevious versions of this standard.1.3 Specimen preparation and evaluation of the results arecovered in ASTM methods or specifications for specificmaterials.General guidance is given in Practice G151.Morespecific information about methods for determining the changein properties after exposure and reporting these results isdescribed in Practice D5870.1.4 The values stated in SI units are to be regarded as thestandard.1.5 Unless otherwise specified,all dimensions are nominal.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 7.NOTE2There is no known ISO equivalent to this standard.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD3980 Practice for Interlaboratory Testing of Paint andRelated Materials(Withdrawn 1998)3D5870 Practice for Calculating Property Retention Index ofPlasticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3.Terminology3.1 DefinitionsThe definitions given in Terminology G113are applicable to this practice.1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved April 15,2019.Published May 2019.Originallyapproved in 1987.Last previous edition approved in 2010 as D4674-02a(2010),which was withdrawn January 2019 and reinstated in April 2019.DOI:10.1520/D4674-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.Summary of Practice4.1 This practice provides for the exposure of specimens tofluorescent light under cont