1、Designation:D436413Standard Practice forPerforming Outdoor Accelerated Weathering Tests ofPlastics Using Concentrated Sunlight1This standard is issued under the fixed designation D4364;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、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 use of Fresnel-reflecting con-centrators that use the sun as a source of ultraviolet(
3、UV)andlonger wavelength radiation.Such devices are used in theoutdoor accelerated exposure testing of plastics.1.2 This practice provides a procedure for performing out-door accelerated exposure testing of plastics using a Fresnel-reflector outdoor accelerated weathering test machine.Theapparatus is
4、 described herein and in Practice G90 morecompletely.1.3 This practice is applicable to a range of plastic materialsincluding,but not limited to,plastic films,sheets,laminates,and extruded and molded products in a variety of shapes andsizes,as specified in 8.2 and 8.3.1.4 This practice describes tes
5、t conditions that attempt tosimulate plastics exposures in desert and subtropical climates.Specimen preparation,property testing procedures,and theevaluation of results are covered in existing test methods orspecifications for specific materials.1.5 The values stated in SI units are to be regarded a
6、sstandard.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 app
7、lica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Section 7.NOTE1This standard is equivalent to ISO 877-3:2009.2.Referenced Documents2.1 ASTM Standards:2D859 Test Method for Silica in WaterD883 Terminology Relating to PlasticsD1435 Practice for Outdoo
8、r Weathering of PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1898 Practice for Sampling of Plastics(Withdrawn 1998)3D4141 Practice for Conducting Black Box and Solar Con-centrating Exposures of CoatingsD4517 Test Method for Low-Level Total Silica in High-Purity Water by Flame
9、less Atomic Absorption Spectros-copyE772 Terminology of Solar Energy ConversionE824 Test Method for Transfer of Calibration From Refer-ence to Field RadiometersG7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG24 Practice for Conducting Exposures to Daylight Filter
10、edThrough GlassG90 Practice for Performing Accelerated Outdoor Weather-ing of Nonmetallic Materials Using Concentrated NaturalSunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic Materials2.2 ISO Standard:4ISO 877-3:2009 PlasticsMethods of exposure to solarrad
11、iationPart 3:Intensified weathering using concen-trated solar radiation3.Terminology3.1 DefinitionsFor definitions of technical terms pertain-ing to plastics used in this practice,see Terminologies D883,D1600,E772,and G113(for weathering terminology).1This practice is under the jurisdiction ofASTM C
12、ommittee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved July 15,2013.Published August 2013.Originallyapproved in 1984.Last previous edition approved in 2005 as D4364 05.DOI:10.1520/D4364-13.2For referenced ASTM standards,visi
13、t 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 A
14、merican 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 4.Significance and Us
15、e4.1 This practice involves the concentration of sunlight by asystem of plane mirrors,arranged to simulate a parabolictrough focused on an air-cooled target board on which the testspecimens are mounted.Exposure cycles with and withoutwater spray that are commonly used for this method aredescribed in
16、 Table 1.Other exposure cycles not listed in Table1 can be used,upon consensual agreement between interestedparties.4.1.1 Accelerated outdoor exposure tests performed usingthis practice in an absence of a programmed moisture cycle areintended to simulate conventional exposure testing on racksfacing the equator in desert and arid regions.4.1.2 Accelerated outdoor exposure tests performed usingthis practice with a programmed moisture cycle shall possessthe feature of spraying high purity water on
