ASTM_G_154_-_12a.pdf

Designation:G15412aStandard Practice forOperating Fluorescent Ultraviolet(UV)Lamp Apparatus forExposure of Nonmetallic Materials1This standard is issued under the fixed designation G154;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.Scope*1.1 This practice covers the basic principles and operatingprocedures for using fluorescent UV light,and water apparatusintended to reproduce the weathering effects that occur whenmaterials are exposed to sunlight(either direct or throughwindow glass)and moisture as rain or dew in actual usage.This practice is limited to the procedures for obtaining,measuring,and controlling conditions of exposure.A numberof exposure procedures are listed in an appendix;however,thispractice does not specify the exposure conditions best suitedfor the material to be tested.NOTE1Practice G151 describes performance criteria for all exposuredevices that use laboratory light sources.This practice replaces PracticeG53,which describes very specific designs for devices used for fluores-cent UV exposures.The apparatus described in Practice G53 is covered bythis practice.1.2 Test specimens are exposed to fluorescent UV lightunder controlled environmental conditions.Different types offluorescent UV light sources are described.1.3 Specimen preparation and evaluation of the results arecovered in ASTM methods or specifications for specificmaterials.General guidance is given in Practice G151 andISO 4892-1.More specific information about methods fordetermining the change in properties after exposure andreporting these results is described in ISO 4582.1.4 The values stated in SI units are to be regarded as thestandard.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.1.6 This standard is technically similar to ISO 4892-3 andISO DIS 11507.2.Referenced Documents2.1 ASTM Standards:2D3980 Practice for Interlaboratory Testing of Paint andRelated Materials(Withdrawn 1998)3E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG53 Practice for Operating Light-and Water-Exposure Ap-paratus(Fluorescent UV-Condensation Type)for Expo-sure of Nonmetallic Materials(Withdrawn 2000)3G113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light Sources2.2 CIE Standard:CIE-Publ.No.85:Recommendations for the IntegratedIrradiance and the Spectral Distribution of SimulatedSolar Radiation for Testing Purposes42.3 ISO Standards:ISO 4582 PlasticsDetermination of the Changes of Colourand Variations in Properties After Exposure to DaylightUnder Glass,Natural Weathering or Artificial Light5ISO 4892-1 PlasticsMethods of Exposure to LaboratoryLight Sources,Part 1,Guidance5ISO 4892-3 PlasticsMethods of Exposure to LaboratoryLight Sources,Part 3,Fluorescent UV lamps5ISO DIS 11507 Paint and VarnishesExposure of Coatingsto Artificial Weathering in ApparatusExposure to Fluo-rescent Ultraviolet and Condensation Apparatus53.Terminology3.1 DefinitionsThe definitions given in Terminology G113are applicable to this practice.1This practice is under the jurisdiction ofASTM Committee G03 on Weatheringand Durabilityand is the direct responsibility of Subcommittee G03.03 on Simulatedand Controlled Exposure Tests.Current edition approved Dec.15,2012.Published December 2012.Originallyapproved in 1997.Last previous edition approved in 2006 as G154 06.DOI:10.1520/G0154-12a.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.4Available from Secretary,U.S.National Committee,CIE,National Institute ofStandards and Technology(NIST),Gaithersburg,MD 20899.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Definitions of Terms Specific to This StandardAs usedin this practice,the term sunlight is identical to the termsdaylight and solar irradiance,global as they are defined inTerminology G113.3.2.1 Fluorescent Ultraviolet(UV)ApparatusAn appara-tus for performing exposure tests using fluorescent UV lampsas the ligh