ASTM_G_154_-_16.pdf

Designation:G15416Standard 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 is limited to the basic principles foroperating a fluorescent UV lamp and water apparatus;on itsown,it does not deliver a specific result.1.2 It is intended to be used in conjunction with a practice ormethod that defines specific exposure conditions for an appli-cation along with a means to evaluate changes in materialproperties.This practice is intended to reproduce the weather-ing effects that occur when materials are exposed to sunlight(either direct or through window glass)and moisture as rain ordew in actual usage.This practice is limited to the proceduresfor obtaining,measuring,and controlling conditions of expo-sure.NOTE1Practice G151 describes general procedures to be used whenexposing nonmetallic materials in accelerated test devices that uselaboratory light sources.NOTE2A number of exposure procedures are listed in an appendix;however,this practice does not specify the exposure conditions best suitedfor the material to be tested.1.3 Test specimens are exposed to fluorescent UV lightunder controlled environmental conditions.Different types offluorescent UV lamp sources are described.NOTE3In this standard,the terms UV light and UV radiation are usedinterchangeably.1.4 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.NOTE4General information about methods for determining thechange in properties after exposure and reporting these results is describedin ISO 4582 and Practice D5870.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.1.7 This standard is technically similar to ISO 4892-3 andISO 16474-3.2.Referenced Documents2.1 ASTM Standards:2D5870 Practice for Calculating Property Retention Index ofPlasticsD6631 Guide for Committee D01 for Conducting an Inter-laboratory Study for the Purpose of Determining thePrecision of a Test MethodG113 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 SourcesG177 Tables for Reference Solar Ultraviolet Spectral Distri-butions:Hemispherical on 37 Tilted Surface2.2 ISO Standards:3ISO 4582 PlasticsDetermination of the Changes of Colourand Variations in Properties After Exposure to DaylightUnder Glass,Natural Weathering or Artificial LightISO 4892-1 PlasticsMethods of Exposure to LaboratoryLight SourcesPart 1,GuidanceISO 4892-3 PlasticsMethods of Exposure to LaboratoryLight SourcesPart 3,Fluorescent UV lampsISO 16474-3 Paints and VarnishesMethods of Exposure toLaboratory Light SourcesPart 3:Fluorescent UV Lamps3.Terminology3.1 DefinitionsThe definitions given in Terminology G113are applicable to this practice.3.2 Definitions of Terms Specific to This StandardAs used1This 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 March 1,2016.Published September 2016.Originallyapproved in 1997.Last previous edition approved in 2012 as G154 12a.DOI:10.1520/G0154-16.2For 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.3Available 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 in 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)lamp Apparatusanapparatus specifically designed for performing artificial accel-erated weathering and irradiation tests using fluorescent UVlamps as the light source and including a means to expose thetest specimens to moisture and controlled temperature.4.Summary of Practice4.