ASTMG快速紫外老化测试.pdf

1、Designation:G 154 00ae1Standard Practice forOperating Fluorescent Light Apparatus for UV Exposure ofNonmetallic Materials1This standard is issued under the fixed designation G 154;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y

2、ear of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.e1NOTETable X2.2 was added editorially in August 2001.1.Scope1.1 This practice covers the basic principles and operatingproced

3、ures 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

4、 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 G 151 describes performance criteria for all exposuredevices that use laboratory light sou

5、rces.This practice replaces PracticeG 53,which describes very specific designs for devices used for fluores-cent UV exposures.The apparatus described in Practice G 53 is coveredby this practice.1.2 Test specimens are exposed to fluorescent UV lightunder controlled environmental conditions.Different

6、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 G 151 and ISO4892-1.More specific information about methods for deter-mining the change i

7、n 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 stand

8、ard 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:D 3980 Practice for Interlaboratory Testing of Paint andR

9、elated Materials2E 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3G 53 Practice for Operating Light-and Water-ExposureApparatus(Fluorescent UV-Condensation Type)for Expo-sure of Nonmetallic Materials4G 113 Terminology Relating to Natural and Artificia

10、lWeathering Tests for Nonmetallic Materials4G 151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices That Use Laboratory LightSources42.2CIE Standard:CIE-Publ.No.85:Recommendations for the IntegratedIrradiance and the Spectral Distribution of SimulatedSolar Radiation for Testin

11、g Purposes52.3ISO Standards:ISO 4582,PlasticsDetermination of the Changes of Co-lour and Variations in Properties After Exposure to Day-light Under Glass,Natural Weathering or Artificial Light6ISO 4892-1,PlasticsMethods of Exposure to LaboratoryLight Sources,Part 1,Guidance6ISO 4892-3,PlasticsMethod

12、s of Exposure to LaboratoryLight Sources,Part 3,Fluorescent UV lamps6ISO DIS 11507,Paint and VarnishesExposure of Coat-ings to Artificial Weathering in ApparatusExposure toFluorescent Ultraviolet and Condensation Apparatus63.Terminology3.1 DefinitionsThe definitions given in TerminologyG 113 are app

13、licable to this practice.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 G 113.1This practice is under the jurisdiction of ASTM Committee G3 on Weatheringand Du

14、rability and is the direct responsibility of Subcommittee G03.03 onSimulated and Controlled Exposure Tests.Current edition approved June 10,2000.Published September 2000.Originallypublished as G 154 97.Last previous edition G 154 00.2Discontinued 1998.See 1998 Annual Book of ASTM Standards,Vol 06.01

15、.3Annual Book of ASTM Standards,Vol 14.02.4Annual Book of ASTM Standards,Vol 14.04.5Available from Secretary,U.S.National Committee,CIE,National Institute ofStandards and Technology(NIST),Gaithersburg,MD 20899.6Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY

16、10036.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.4.Summary of Practice4.1 Specimens are exposed to repetitive cycles of light andmoisture under controlled environmental conditions.4.1.1 Moisture is usually produced by condensation ofwater vapor onto the test specimen or by spraying the speci-mens with demineralized/deionized water.4.2 The exposure condition may be varied by selection of:4.2.1 The fluorescent lamp,4.2.2 The lamps irradiance level,4.2.3 The