ASTM_D_4674_-_02a_2010.pdf

Designation:D467402a(Reapproved 2010)Standard 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 practice may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,is any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health 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.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.4.Summary of Practice4.1 This practice provides for the exposure of specimens tofluorescent light under controlled environmental conditions.Radiant energy is provided by one of the following fluorescentlight sources:(1)VHO cool-white fluorescent lamps and glassfiltered fluorescent UV lamps,(2)VHO cool-white fluorescent1This 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 Oct.1,2010.Published March 2011.Originallyapproved in 1987.Last previous edition approved in 2002 as D4674-02a.DOI:10.1520/D4674-02AR10.2For 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 States1 lamps alone,(3)standard output cool white fluorescent lampsalone,or(4)UVA-351 fluorescent UVA lamps.4.1.1 Method I is intended to simulate the conditions in anoffice environment plus a portion of solar UV radiationtransmitted by window glass.Methods II and III are intendedto simulate only the indoor lighting component of a typicaloffice environment.Method IV is intended to simulate only theeffects of a portion