1、Designation:D4799/D4799M17Standard Practice forAccelerated Weathering Test Conditions and Procedures forBituminous Materials(Fluorescent UV,Water Spray,andCondensation Method)1This standard is issued under the fixed designation D4799/D4799M;the number immediately following the designation indicates
2、theyear of original 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 describes test conditions and proceduresf
3、or fluorescent UV and condensation exposures conductedaccording to Practices G151 and G154 for bituminous roofingand waterproofing materials.(See Terminology 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 ma
4、y not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility o
5、f the user of this standard to establish appro-priate safety and health practices and determine the applica-bility 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 Dec
6、ision 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:2D36/D36M Test Method for Softening Point of Bitumen(Ring-and-Ball Apparatus)D1669/D1
7、669M Practice for Preparation of Test Panels forAccelerated and Outdoor Weathering of Bituminous Coat-ingsD1670/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
8、 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 inAccel-erated Test Devices that Use Laboratory
9、 Light SourcesG154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic Materials3.Summary of Test Method3.1 Thin films of bitumen are uniformly applied to alumi-num panels.Shingles and similar materials are cut to size andexposed to specified cycles of temper
10、ature,light,and water.Achoice of six test cycles is given along with options fordetermining the period of exposure and evaluating results.4.Significance and Use4.1 This weathering apparatus is used for comparing theweathering characteristics of bituminous materials against acontrol material for whic
11、h the outdoor weathering characteris-tics are known.It is not possible to establish a precisecorrelation between accelerated and natural weathering be-cause(1)there are geographical climatic variations,localweather variations,and variations in local pollutants,and(2)the relation between accelerated
12、and natural weathering ismaterial dependent.Acceleration factors differ between mate-rials as well as between formulations of the same material.Guide G141 provides guidance regarding this issue.NOTE1This practice can be used for other than bituminous materials,but the significance and use have not b
13、een evaluated.5.Apparatus5.1 The fluorescent UV and condensation apparatus usedshall conform to the requirements defined in Practices G151and G154.1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.02 on Stee
14、pRoofing Products and Assemblies.Current edition approved June 1,2017.Published July 2017.Originally approvedin 1988.Last previous edition approved in 2013 as D4799/D4799M 08(2013)1.DOI:10.1520/D4799_D4799M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer
15、 Service at serviceastm.org.For Annual Book of ASTMStandards volume 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 acc
16、ordance 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.1 5.2 LampsThe lamps shall be fluorescent UVA-340 lampsas described in 6.1.3.1 of Practice G154.5.3 MoistureIt is permitted to expose the test specimens tomoisture in the form of water spray,condensation,or highhumidity.5.3.1 Water Sp
