ASTM_G_153_-_13.pdf

Designation:G15313Standard Practice forOperating Enclosed Carbon Arc Light Apparatus forExposure of Nonmetallic Materials1This standard is issued under the fixed designation G153;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 enclosed carbon-arc light and waterapparatus intended to reproduce the weathering effects thatoccur when materials are exposed to sunlight(either direct orthrough window glass)and moisture as rain or dew in actualuse.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 PracticeG23,which describes very specific designs for devices used for carbon-arcexposures.The apparatus described in Practice G23 is covered by thispractice.1.2 Test specimens are exposed to enclosed carbon arc lightunder controlled environmental conditions.1.3 Specimen preparation and evaluation of the results arecovered in various methods or specifications for specificmaterials.General guidance is given in Practice G151 and ISO4892-1.More specific information about methods for deter-mining the change in properties after exposure and reportingthese 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.1.5.1 Should any ozone be generated from the operation ofthe light source,it shall be carried away from the testspecimens and operating personnel by an exhaust system.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Documents2.1 ASTM Standards:2D3980 Practice for Interlaboratory Testing of Paint andRelated Materials(Withdrawn 1998)3E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG23 Practice for Operating Light-Exposure Apparatus(Carbon-Arc Type)With and Without Water for Exposureof 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 ISO Standards:ISO 4582 PlasticsDetermination of the Changes of Colourand Variations in Properties After Exposure to DaylightUnder Glass,Natural Weathering or Artificial Light4ISO 4892-1 PlasticsMethods of Exposure to LaboratoryLight Sources,Part 1,General Guidance4ISO 4892-4 PlasticsMethods of Exposure to LaboratoryLight Sources,Part 4,Open-Flame Carbon Arc Lamp42.3 CIE Standards:CIE-Publ.No.85:Recommendations for the Integrated Ir-radiance and the Spectral Distribution of Simulated SolarRadiation for Testing Purposes53.Terminology3.1 DefinitionsThe definitions that are applicable to thispractice are provided in Terminology G113.3.1.1 As used in this practice,the term sunlight is identicalto the terms daylight and solar irradiance,global as they aredefined in Terminology G113.1This practice is under the jurisdiction ofASTM Committee G03 on Weatheringand Durability and is the direct responsibility of Subcommittee G03.03 onSimulated and Controlled Exposure Tests.Current edition approved July 1,2013.Published July 2013.Originally approvedin 1997.Last previous edition approved in 2004 as G153 04(2010).DOI:10.1520/G0153-13.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from Secretary,U.S.National Committee,CIE,National Institute ofStandards and Technology,Gaithersburg,MD 20899.*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 4.Summary of Practice4.1 Specimens are exposed to repetitive cycles of light andmoisture under controlled environmental conditions.Moistureusually is produced by spraying the test specimen withdemineralized/deionized water or by condensation of watervapor onto the spec