1、Designation:D4798/D4798M11(Reapproved 2021)Standard Practice forAccelerated Weathering Test Conditions and Procedures forBituminous Materials(Xenon-Arc Method)1This standard is issued under the fixed designation D4798/D4798M;the number immediately following the designation indicates theyear of origi
2、nal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers test conditions and procedures forxenon-arc exposu
3、res according to Practices G151 and G155 forbituminous roofing and waterproofing materials.(See Termi-nology G113.)1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem s
4、hall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.3 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-pr
5、iate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopm
6、ent of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1669/D1669M Practice for Preparation of Test Panels forAccelerated and Outdoor Weathering of Bituminous Coat-ingsD1670
7、/D1670M Test Method for Failure End Point in Ac-celerated and Outdoor Weathering of Bituminous Materi-alsG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG147 Practice for Co
8、nditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic MaterialsG169 G
9、uide for Application of Basic Statistical Methods toWeathering Tests3.Summary of Test Method3.1 Thin films of bitumen are uniformly applied to alumi-num panels.Shingles and similar products are cut to size andexposed to specified cycles of temperature,light,and water.Achoice of two test cycles is gi
10、ven along with options fordetermining the period of exposure and evaluating results.4.Significance and Use4.1 Tests conducted according to this practice are used tocompare the weathering characteristics of bituminous materialsversus a control material of known outdoor durability.It is notpossible to
11、 establish a single relationship that is applicable toall materials between time in accelerated tests conductedaccording to this practice and time in natural weatheringbecause(1)there are geographical climatic variations,localweather variations,and variations in local pollutants,and(2)the relation b
12、etween accelerated and natural weathering ismaterial dependent with differences in acceleration factorsbetween materials as well as for different formulations of thesame material.Guide G141 provides guidance regarding vari-ability in outdoor and accelerated weathering tests and aboutthe use of contr
13、ol materials.NOTE1It is recommended that outdoor weathering be used to validatethe laboratory accelerated test in terms of performance ranking.NOTE2This practice can be used for other than bituminous materials,but the significance and use have not been evaluated.5.Apparatus5.1 The xenon-arc apparatu
14、s used shall conform to therequirements defined in Practices G151 and G155.1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.02 on SteepRoofing Products and Assemblies.Current edition approved Jan.1,2021.Pub
15、lished January 2021.Originallyapproved in 1988.Last previous edition approved in 2016 as D4798/D4798M 11(2016).DOI:10.1520/D4798_D4798M-11R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume
16、information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM 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.15