1、Designation:D90499(Reapproved 2021)Standard Practice forExposure of Adhesive Specimens to Artificial Light1This standard is issued under the fixed designation D904;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 ultraviolet(UV)light aging(with or withoutwater)of adhesive bo
3、nded joints having at least one glass ortransparent adherend,using fluorescent UV(see Method A)orxenon-arc light sources(see Method B).1.2 This practice is limited to the apparatus for obtaining,measuring,and controlling the aging conditions,and to theprocedures for exposure.Sample preparation,stren
4、gth,testconditions,and evaluation of the results are described in otherASTM test methods or specifications.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concern
5、s,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internat
6、ionally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D907 Termino
7、logy of AdhesivesG151 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 MaterialsG155 Practice for Operating Xenon Arc Light Apparatus forExposure
8、of Non-Metallic Materials3.Terminology3.1 DefinitionsMany of the terms in this practice aredefined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 irradiance,n(1)the rate at which light energy fallson a unit area of surface(W/m2),or(2)the radiant powerincident upon a uni
9、t area of surface.3.2.2 radiant exposure(or light dosage),n(1)the accu-mulated light energy which has fallen on a unit area over time(J/m2),or(2)the irradiance integrated with respect to time.3.2.3 spectral irradiance,nthe distribution of irradiancein accordance with wavelength.3.2.3.1 DiscussionSpe
10、ctral irradiance is usually shown asa curve relating irradiance(ordinate)and light wavelength(abscissa).Because shorter wavelength UV is usually moredamaging than longer wavelength UV,lamps with differentspectral irradiance curves can cause drastically differentamounts of UV damage,even if they prod
11、uce the same totalirradiance.3.2.4 spectral power distribution(SPD),nthe amount ofradiation present at each wavelength.3.2.4.1 DiscussionThe SPD can be expressed by power inwatts,irradiance in watts/square metre,or energy in joules.Theshape of the SPD would be identical in all of these units.Fluores
12、cent lamps are frequently described by relative SPDswhich show the amount of radiation at each wavelength as apercentage of the amount of radiation at the peak wavelength.3.2.5 UV-A,nultraviolet light in the wavelength bandbetween 315 and 400 nm.3.2.6 UV-B,nultraviolet light in the wavelength bandbe
13、tween 280 and 315 nm.4.Significance and Use4.1 This practice is for determining the effects of UV light,or UV light and water,on adhesive bonded joints undercontrolled but artificial conditions.The results of this practicecan be used for comparing the relative durability of severaladhesives in a spe
14、cific laboratory UV exposure.1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.40 on Adhesives for Plastics.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1946.Last previous edition approv
15、ed in 2013 as D904 99(2013).DOI:10.1520/D0904-99R13.2For 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.Copyright ASTM
16、 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.2 This practice is not for determining a forecast of the lifeof an adhesive bond in servi
