ASTM_D_572_-_04_2015.pdf

Designation:D57204(Reapproved 2015)Standard Test Method forRubberDeterioration by Heat and Oxygen1This standard is issued under the fixed designation D572;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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.1.Scope1.1 This test method covers a procedure to determine therelative deterioration resistance of vulcanized rubber in a hightemperature and high pressure oxygen environment.There maybe no exact correlation between this accelerated test andnatural aging of rubber because of the varied conditions ofnatural aging.This accelerated test is suitable for laboratorycompound or product comparisons.NOTE1For evaluating rubber vulcanizates under less severe condi-tions more nearly approaching natural aging,the use of Test MethodsD573 and D865 is recommended.1.2 The values 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 and health practices and determine the applica-bility of regulatory limitations prior to use.(For specificprecautionary statement,see Note 2.)2.Referenced Documents2.1 ASTM Standards:2D15 Method of Compound and Sample Preparation forPhysical Testing of Rubber Products(Withdrawn 1975)3D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD454 Test Method for Rubber Deterioration by Heat andAirPressureD573 Test Method for RubberDeterioration in an AirOvenD865 Test Method for RubberDeterioration by Heating inAir(Test Tube Enclosure)D3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Summary of Test Method3.1 Specimens of vulcanized rubber are exposed to a dete-riorating influence at a specified elevated temperature andoxygen pressure for known periods of time,after which theirphysical properties are determined.These are compared withthe properties determined on the original specimens and thechanges noted.3.2 Unless otherwise specified,the determination of thephysical properties shall be carried out in accordance with TestMethods D412.3.3 Except as may be otherwise specified in this testmethod,the requirements of Practices D3182 and D3183 shallbe complied with and are made part of this test method.3.4 In case of conflict between the provisions of this testmethod and those of detailed specifications or test methods fora particular material,the latter shall take precedence.4.Significance and Use4.1 Rubber and rubber products must resist the deteriorationof physical properties with time caused by oxidative andthermal aging.This test method provides a way to assess theseperformance characteristics of rubber,under certain acceler-ated conditions as specified.4.2 Please refer to the Annex in Test Method D573 forimportant information on standard compounds used for preci-sion testing for accelerated test aging evaluation.5.Oxygen-Pressure VesselNOTE2Caution:Adequate safety provisions are important whenheating oxidizable organic materials in oxygen since the rate of reactionmay become very rapid in some cases,particularly if large surface area is1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.15 on Degradation Tests.Current edition approved July 1,2015.Published October 2015.Originallyapproved in 1940.Last previous edition approved in 2010 as D572 04(2010).DOI:10.1520/D0572-04R15.2For 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 historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 exposed,and very high pressures may be developed.If the sameequipment is used for the oxygen-pressure test and the air-pressure heattest,Test Method D454,care must be exercised to see that the thermostaticcontrols are properly set,since the specimens may react very rapidly withoxygen at the temperature of the air-pressure heat test.Liquids acceptableas heating media for one test may be hazardous when used for the othertest.5.1 The oxygen-pressure chamber shall consist of a metalve