1、Designation:D520814(Reapproved 2022)Standard Practice forFluorescent Ultraviolet(UV)Exposure of PhotodegradablePlastics1This standard is issued under the fixed designation D5208;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the yea
2、r 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.Scope1.1 This practice covers the specific procedures applicablefor fluorescent Ultraviolet(UV)exposure of photodegradableplast
3、ics conducted in accordance with Practices G151 andG154.This practice also covers the preparation of test speci-mens and the evaluation of test results.1.2 Practice D4329 covers fluorescent UV exposures ofplastics intended for long term use in outdoor applications.1.3 The values stated in SI units a
4、re to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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,health,and environmental p
5、ractices and deter-mine the applicability of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principle
6、s 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:2D3826 Practice for Determining Degradation End Point inDegradable Polyethylene and Polypropylene Using
7、 a Ten-sile TestD4329 Practice for Fluorescent Ultraviolet(UV)Lamp Ap-paratus Exposure of PlasticsD5870 Practice for Calculating Property Retention Index ofPlasticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG113 Terminology Relating to Natural and
8、 Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inA
9、ccel-erated Test Devices that Use Laboratory Light SourcesG154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic MaterialsG169 Guide for Application of Basic Statistical Methods toWeathering Tests3.Terminology3.1 The definitions given in Terminology G113 ar
10、e appli-cable to this practice.4.Significance and Use4.1 Materials made from photodegradable plastics are in-tended to show relatively rapid deterioration of chemical,physical,and mechanical properties when exposed to light,heat,and water after fulfilling their intended purpose.Thispractice is inten
11、ded to induce property changes associated withconditions that might be experienced when the material isdiscarded as litter,including the effects of sunlight,moisture,and heat.The exposure used in this practice is not intended tosimulate the deterioration caused by localized weather phe-nomena such a
12、s atmospheric pollution,biological attack,andsalt water exposure.4.2 CautionsVariation in results can be expected whenoperating conditions are varied within the accepted limits ofthis practice.Therefore,no reference to the use of this practiceshall be made unless accompanied by a report prepared ina
13、ccordance with Section 9 that describes the specific operatingconditions used.Refer to Practice G151 for detailed informa-tion on the caveats applicable to use of results obtained inaccordance with this practice.NOTE2Additional information on sources of variability and on1This practice is under the
14、jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved July 1,2022.Published July 2022.Originally approvedin 1991.Last previous edition approved in 2014 as D5208-14.DOI:10.1520/D5208-14R22.2For reference
15、d 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.*A Summary of Changes section appears at the end of this standardCopyright 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.1strategies for addressing variability in the design,execution and dataanalysis of laboratory
