ASTM_G_24_-_13.pdf

Designation:G2413Standard Practice forConducting Exposures to Daylight Filtered Through Glass1This standard is issued under the fixed designation G24;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice evaluates the resistance of nonmetallicmaterials to solar radiation filtered through glass in passivelyventilated and non-vented enclosures.For exposures in underglass enclosures with forced air circulation,refer to PracticeG201.1.2 For direct exposures,refer to Practice G7.1.3 This practice is limited to the method of conducting theexposures.The preparation of test specimens and evaluation ofresults are covered in various standards for the specificmaterials.1.4 Exposure conducted according to this practice can usetwo types of exposure cabinets.1.4.1 Type AA cabinet that allows passive ventilation ofspecimens being exposed behind glass.1.4.2 Type BEnclosed cabinet with exterior painted blackthat does not provide for ventilation of specimens exposedbehind glass.Exposures conducted using a Type B cabinet aretypically referred to as“black box under glass exposures.”1.5 Type A exposures of this practice are technically similarto Method B of ISO 877-2.1.6 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.7 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.2.Referenced Documents2.1 ASTM Standards:2C1036 Specification for Flat GlassD3424 Practice for Evaluating the Relative Lightfastnessand Weatherability of Printed MatterD4303 Test Methods for Lightfastness of Colorants Used inArtists MaterialsD6901 Specification for Artists Colored PencilsE824 Test Method for Transfer of Calibration From Refer-ence to Field RadiometersE903 Test Method for Solar Absorptance,Reflectance,andTransmittance of Materials Using Integrating SpheresE1084 Test Method for Solar Transmittance(Terrestrial)ofSheet Materials Using SunlightG7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG173 Tables for Reference Solar Spectral Irradiances:DirectNormal and Hemispherical on 37 Tilted SurfaceG177 Tables for Reference Solar Ultraviolet Spectral Distri-butions:Hemispherical on 37 Tilted SurfaceG201 Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation2.2 Other Documents:WMO Guide to Meteorological Instruments and Methods ofObservation WMO No.8,Seventh Edition.3ISO 105 B01 TextilesTests for Colour Fastness,Interna-tional Standards Organization,Geneva,Switzerland.4ISO 877-1 Plastics Methods of Exposure to Solar Radia-tion Part 1:General Guidance4ISO 8772 Plastics Methods of Exposure to Solar Radia-tion Part 2:Direct Weathering and Exposure BehindWindow GlasAATCC TM 16,Option 6 Colorfastness to Light,Daylight5AATCC Test Method 16.1-2012 Colorfastness to Light:Outdoor3.Terminology3.1 Definitions:1This practice is under the jurisdiction ofASTM Committee G03 on Weatheringand Durabilityand is the direct responsibility of Subcommittee G03.02 on Naturaland Environmental Exposure Tests.Current edition approved June 1,2013.Published July 2013.Originally approvedin 1973.Last previous edition approved in 2005 as G24 05.DOI:10.1520/G0024-13.2For 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.3Available from World Meteorological Organization(WMO),7bis,avenue de laPaix,Case Postale No.2300,CH-1211 Geneva 2,Switzerland,http:/www.wmo.int.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from American Association of Textile Chemists and Colorists(AATCC),P.O.Box 12215,Research Triangle Park,NC 27709,http:/www.aatcc.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 3.1.1 The definitions contained in Terminology G113 areapplicable to this practice.4.Significance and Use4.1 Since solar radiation,air temperature,relative humidity,and the amount and kind of atmospheric contaminants varycontinuously,results from exposures based on elapsed timemay differ.The variations in the results may be minimized bytiming the exposures in terms of:4.1.1 One or more envir