1、Designation:D313781(Reapproved 2013)Standard Test Method forRubber PropertyHydrolytic Stability1This standard is issued under the fixed designation D3137;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 covers the determination of the abilityo
3、f rubber to withstand the environmental effects of highhumidity.This is accomplished by examination of the materialafter removal from the moisture-laden environment.It isdesigned for testing specimens of rubber materials cut fromstandard sheets prepared in accordance with Practice D3182.1.2 The valu
4、es stated in SI units are to be regarded as thestandard.The values given in parentheses 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
5、 and health practices and determine the applica-bility of regulatory limitations prior to use.(For specificprecautionary statements,see Note 1.)2.Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD573 Test Method for RubberDeteriorati
6、on in an AirOvenD3040 Practice for Preparing Precision Statements for Stan-dards Related to Rubber and Rubber Testing(Withdrawn1987)3D3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized Sheets3.Summary of Test Method3.1 Test spec
7、imens are exposed to the influence of humidenvironments under definite conditions of temperature,humidity,and time for the purpose of measuring the resultinghydrolytic degradation by noting the change in tensile strengthafter exposure over distilled water.4.Significance and Use4.1 Rubber and rubber
8、products for certain applicationsmust withstand the environmental effect of high humidity andresist the deterioration of physical properties under theseconditions with time.This test method allows performanceproperties to be determined under the accelerated conditions ofhigh humidity and elevated te
9、mperature.4.2 In view of climatic variations in service conditions,thismethod may not give results correlating exactly with serviceperformance.However,the test method yields comparativedata on which to base judgment as to service quality and it isuseful in research and development work.4.3 This test
10、 method is not applicable to coated fabrics;itsuse for materials other than rubber has not been established.5.Test Conditions5.1 TemperatureThe test temperature shall be 85 6 1C(185 6 2F).5.2 Exposure PeriodThe exposure period shall be 96 6 1h.5.3 Conditioning PeriodAfter the specified exposureperio
11、d,the specimens shall be conditioned on a flat surface for16 to 96 h at 50 6 5%relative humidity and 23 6 2C(73.46 3.6F).6.Procedure6.1 Original Tensile StrengthCut three ASTM dumbbellor ring specimens and condition for at least 3 h at 23 6 2C(73.4 6 3.6F)prior to testing.Determine the original tens
12、ilestrength in accordance with Test Methods D412.6.2 Deteriorated Tensile StrengthCut three specimensfrom the same rubber sheet from which specimens were cut forthe original tensile strength.Measure the thickness of each1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand i
13、s the direct responsibility of Subcommittee D11.15 on Degradation Tests.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 1972.Last previous edition approved in 2007 as D3137 81(2007).DOI:10.1520/D3137-81R13.2For referenced ASTM standards,visit the ASTM website,www.as
14、tm.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 historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harb
15、or Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 specimen and suspend the specimens in a container approxi-mately 1 dm3(1 qt)in volume and at least 170 mm(6.7 in.)inheight,containing 100 cm3of distilled water.Suspend thespecimens on noncorrosive metal hooks,soldered to thebottom o
16、f the container cap or on a glass“tree”placed in thecontainer,so that the specimens do not contact the container oreach other.Cap the container loosely and place the container ina circulating air oven(see Test Method D573)according to therequired test conditions(see 5.1 and 5.2).After 15 min,openthe oven briefly and secure the container cap tightly.At the endof the required exposure period,remove the container from theoven and loosen the cap(see Note 1).When the container hascooled to approximat
