1、Designation:D117118Standard Test Method forRubber DeteriorationSurface Ozone Cracking Outdoors(Triangular Specimens)1This standard is issued under the fixed designation D1171;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method permits the estimat
3、ion of the relativeability of rubber compounds used for applications requiringresistance to outdoor weathering.1.2 This test method is not applicable to materials ordinarilyclassed as hard rubber,but is adaptable to molded or extrudedsoft rubber materials and sponge rubber for use in windowweatherst
4、ripping as well as similar automotive applications.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,health,and environmental practices and deter-mine the applic
5、ability 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 theDevelopment of International Standards,Guides and Recom-mendations issued by the
6、 World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D518 Test Method for Rubber DeteriorationSurfaceCracking(Withdrawn 2007)3NOTE1The procedures in Test Method D518 have been incorporatedas Procedures B1,B2,and B3 in Test Methods D1149.D1149 T
7、est Methods for Rubber DeteriorationCracking inan Ozone Controlled Environment3.Summary of Test Method3.1 Procedures are given for preparing triangular cross-section specimens,for mounting them in strained conditionaround specified circular mandrels,and for rating the effect ofexposure as evidenced
8、by the appearance of surface cracks.The type,time,temperature,and other conditions of exposureare not given but shall be agreed upon by the purchaser and theseller and shall be completely described in the test reports.3.2 Two techniques are described,the exposure rating andthe quality-retention rati
9、ng.4.Significance and Use4.1 Molded or extruded rubber products must withstand theeffects of ozone cracking and outdoor weathering for satisfac-tory use.This test enables a simple comparison of performanceto be made under specified test conditions in an outdoor test.No direct correlation between tes
10、t performance and serviceperformance can be claimed due to the wide range of serviceconditions.5.Apparatus5.1 Mounting MandrelA wood mandrel 50 mm(2 in.)inoutside diameter,suitably coated with spar varnish or a clearlacquer.The mandrel may be supported by any convenientmethod.5.2 Fastening WireEname
11、led copper wire,stainless steelwire,or other suitable fastener known to be unaffected byozone and not negatively interact with the specimen.6.Test Specimen6.1 The triangular cross-section test specimen shall be amolded,extruded,or sponge section with a continuous skin orsurface layer,250 mm(10 in.)l
12、ong,and cured in a straightposition.The cross-sectional dimensions shall be as shown inFig.1.Duplicate specimens shall be tested.6.2 It is recommended that the manufacturer observe aminimum rest period of 24 h between compound mixing andcompound preparation,and a minimum rest period of12h1This test
13、method is under the jurisdiction of ASTM Committee D11 on Rubberand Rubber-like Materials and is the direct responsibility of Subcommittee D11.15on Degradation Tests.Current edition approved June 1,2018.Published September 2018.Originallyapproved in 1951.Last previous edition approved in 2016 as D11
14、71 161.DOI:10.1520/D1171-18.2For 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.3The last approved version of this his
15、torical standard is referenced onwww.astm.org.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
16、on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 between compound preparation and curing when preparingspecimens.The finish of the specimens shall be as smooth aspossible.METHOD AEXPOSURE RATING7.Procedure7.1 Mounting of SpecimensPlace bench marks on eachspecimen with a crayon,190 mm(7.5 in.)apart and 32 mm(1.25 in.)from the ends.Form the specimens into a loop byplacing the 19
