1、Designation:D1171161Standard 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
2、of 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.1NOTECorrected 7.2.2 editorially in November 2
3、016.1.Scope1.1 This test method permits the estimation 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 mat
4、erials and sponge rubber for use in windowweatherstripping 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 and healt
5、h practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D518 Test Method for Rubber DeteriorationSurfaceCracking(Withdrawn 2007)3NOTE1The procedures in Test Method D518 have been incorporatedas Procedures B1,B2,and B3 in Test Meth
6、ods D1149.D1149 Test 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 ofexpos
7、ure as evidenced 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 quali
8、ty-retention rating.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 correl
9、ation between test 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 Fa
10、stening WireEnameled copper wire.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.)long,and cured in a straightposition.The cross-sectional dimensions shall be as shown inFig.1.Duplicate spec
11、imens 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 of12hbetween compound preparation and curing when preparingspecimens.The finish of the specimens shall be as smooth aspossi
12、ble.1This test 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 Jan.1,2016.Published January 2016.Originallyapproved in 1951.Last previous edition approved in
13、 2015 as D1171 15.DOI:10.1520/D1171-16E01.2For 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 versi
14、on of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 METHOD AEXPOSURE RATING7.Procedure7.1 Mounting of SpecimensPlace bench marks on eachspecimen with a crayon,190 mm(7.5 in.)apart an
15、d 32 mm(1.25 in.)from the ends.Form the specimens into a loop byplacing the 19-mm(0.75-in.)sides together and tying securelywith wire at the bench marks.Slip the complete loop over themandrel.Place as many specimens on the mandrels as length ofmandrel will permit.7.2 Exposure of Specimens:7.2.1 Cond
16、itioning Period:7.2.1.1 Outdoor ExposureAfter the specimens aremounted allow them to condition for 70 to 72 h at roomtemperature in an ozone free atmosphere.Do not touch thelooped part after mounting until the test is completed.7.2.2 Angle and Direction and Positioning of ExposuresIncline specimens exposed outdoors so that the portion of theloop diametrically opposite the tied ends shall face south at anangle of 45 with the horizontal as shown in Fig.2.7.2.3 Test Conditions:7.2.3.1 Outdoor Expos
