ASTM D4798-2004 Standard Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)《沥青材料的加速老化试验条件和程序的标准规程(氙弧法)》.pdf
《ASTM D4798-2004 Standard Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)《沥青材料的加速老化试验条件和程序的标准规程(氙弧法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4798-2004 Standard Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)《沥青材料的加速老化试验条件和程序的标准规程(氙弧法)》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 4798 04Standard Practice forAccelerated Weathering Test Conditions and Procedures forBituminous Materials (Xenon-Arc Method)1This standard is issued under the fixed designation D 4798; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers test conditions and procedures forxenon-arc exposures according to
3、Practices G 151 and G 155for bituminous roofing and waterproofing materials that have aminimum softening point of approximately 95C (200F) asdetermined by Test Method D 36. (Also see TerminologyG 113.)1.2 The values stated in SI units are to be regarded as thestandard. The values given in parenthese
4、s are for informationonly.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-priate safety and health practices and determine the applica-bility of regulatory limitations pr
5、ior to use.2. Referenced Documents2.1 ASTM Standards:2D 36 Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)D 1669 Practice for Preparation of Test Panels for Acceler-ated and Outdoor Weathering of Bituminous CoatingsD 1670 Test Method for Failure End Point in Acceleratedand Outdo
6、or Weathering of Bituminous MaterialsG 113 Terminology Relating to Natural and ArtificialWeathering Tests of Nonmetallic MaterialsG 141 Guide for Addressing Variability in Exposure Testingon Nonmetallic MaterialsG 147 Practice for Conditioning and Handling of Nonme-tallic Materials for Natural and A
7、rtificial Weathering TestsG 151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices that Use Laboratory Light SourcesG 155 Practice for Operating Xenon Arc Light Apparatusfor Exposure of Nonmetallic Materials3. Summary of Test Method3.1 Thin films of bitumen are uniformly applie
8、d 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 given along with options fordetermining the period of exposure and evaluating results.4. Significance and Use4.1 It is not possible to e
9、stablish a precise correlationbetween accelerated and natural weathering because of geo-graphical climatic variations, local weather variation fromnormal, and local pollutants. This weathering apparatus andprocedure are used for comparing the weathering characteris-tics of bituminous materials again
10、st a reference material forwhich the outdoor weathering characteristics are known. GuideG 141 provides guidance regarding this issue.5. Apparatus5.1 The xenon-arc apparatus used shall conform to therequirements defined in Practices G 151 and G 155.5.2 FiltersDaylight filter as described in Practice
11、G 155.5.3 RadiometerThe use of a radiometer to monitor andcontrol the amount of radiant energy received at the specimenis required. The use of the radiometer shall comply with therequirements in Practice G 151.6. Test Specimens6.1 Unless otherwise agreed upon, test specimens shall beapproximately 70
12、 by 150 mm (234 by 578 in.). Bituminousmaterials shall be applied as uniform coatings on aluminumpanels in accordance with Practice D 1669. Fabricated materi-als such as bituminous roofing, shingles, and similar productsshall be cut to size and their weather surfaces exposed. If theseare too flexibl
13、e to sustain their own weight in a verticalposition, they may be mounted on aluminum panels.6.1.1 Unless otherwise specified, expose at least three rep-licate specimens of each test and control material.6.1.2 Other test specimen sizes may be used to providesufficient material for postexposure testin
14、g when desired.1This practice is under the jurisdiction of ASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.02 on PreparedRoofings, Shingles, and Siding Materials.Current edition approved Nov. 1, 2004. Published November 2004. Originallyapproved in
15、1988. Last previous edition approved in 2001 as D 4798 01.2For referenced 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.1Co
16、pyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.1.3 Follow the procedures described in Practice G 147 foridentification, conditioning, and handling of specimens of test,control, and reference materials before, during, and afterexposur
17、e.6.1.4 Do not mask the face of a specimen for the purpose ofshowing on one panel the effects of various exposure times.Misleading results may be obtained by this method, since themasked portion of the specimen is still exposed to temperatureand humidity cycles that in many cases will affect results
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