1、Designation:D4799/D4799M08(Reapproved 2013)1Standard 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 desi
2、gnation indicates 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.1NOTEUnits information was editorially corrected
3、 in July 2013.1.Scope1.1 This practice describes test conditions and proceduresfor fluorescent UV and condensation exposures conductedaccording to Practices G151 and G154 for bituminous roofingand waterproofing materials that have a minimum softeningpoint of approximately 95C 200F as determined by T
4、estMethod D36.(Also 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 may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two syst
5、ems 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 of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regu
6、latory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D36 Test Method for Softening Point of Bitumen(Ring-and-Ball Apparatus)D1669 Practice for Preparation of Test Panels for Acceler-ated and Outdoor Weathering of Bituminous CoatingsD1670 Test Method for Failure End Point inAccel
7、erated andOutdoor Weathering of Bituminous MaterialsG113 Terminology Relating to Natural and 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
8、 Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic Materials3.Summary of Test Method3.1 Thin films of b
9、itumen are uniformly applied to alumi-num panels.Shingles and similar materials are cut to size andexposed to specified cycles of temperature,light,and water.Achoice of three test cycles is given along with options fordetermining the period of exposure and evaluating results.4.Significance and Use4.
10、1 This weathering apparatus is used for comparing theweathering characteristics of bituminous materials against acontrol material for which the outdoor weathering characteris-tics are known.It is not possible to establish a precisecorrelation between accelerated and natural weathering be-cause(1)the
11、re are geographical climatic variations,localweather variations,and variations in local pollutants,and(2)the relation between accelerated and natural weathering ismaterial dependent.Acceleration factors differ between mate-rials as well as between formulations of the same material.Guide G141 provide
12、s guidance regarding this issue.NOTE1This practice can be used for other than bituminous materials,but the significance and use have not been evaluated.5.Apparatus5.1 The fluorescent UV and condensation apparatus usedshall conform to the requirements defined in Practices G151and G154.5.2 LampsUnless
13、 otherwise specified,the lamps shall befluorescent UVA-340 lamps as described in 6.1.3.1 of PracticeG154.1This 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 e
14、dition approved July 1,2013.Published July 2013.Originally approvedin 1988.Last previous edition approved in 2008 as D4799 08.DOI:10.1520/D4799_D4799M-08R13E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of AST
15、MStandards 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 States1 5.2.1 Other fluorescent UV lamps meeting the size andelectrical characteristics in 5.2 may be us
16、ed if mutually agreedupon and provided that the lamp and spectral energy distribu-tion are reported in conformance with Section 9.5.3 MoistureIt is permitted to expose the test specimens tomoisture in the form of water spray,condensation,or highhumidity.5.3.1 Water SprayIt is permitted to equip the test chamberwith a means to introduce intermittent water spray onto the testspecimens under specified conditions.The spray shall beuniformly distributed over the samples.The spray system shallbe made
