ASTM_D_573_-_04_2015.pdf

Designation:D57304(Reapproved 2015)Standard Test Method forRubberDeterioration in an Air Oven1This standard is issued under the fixed designation D573;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 theinfluence of elevated temperature on the physical properties ofvulcanized rubber.The results of this test method may not givean exact correlation with service performance since perfor-mance conditions vary widely.This test method may,however,be used to evaluate rubber compounds on a laboratory com-parison basis.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 1.)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Documents2.1 ASTM Standards:2D15 Method of Compound and Sample Preparation forPhysical Testing of Rubber Products(Withdrawn 1975)3D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1349 Practice for RubberStandard Conditions for Test-ingD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsD3184 Practice for RubberEvaluation of NR(NaturalRubber)D3185 Test Methods for RubberEvaluation of SBR(Styrene-Butadiene Rubber)Including Mixtures With OilD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Summary of Test Method3.1 Specimens of vulcanized rubber are exposed to thedeteriorating influence of air at specified elevated temperaturesfor known periods of time,after which their physical propertiesare determined.These are compared with the properties deter-mined on the original specimens and the changes 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 Annex A1 for important information onstandard compounds used for precision testing for acceleratedtest aging evaluation.5.Apparatus5.1 Type IIB ovens specified in Test Method E145 aresatisfactory for use through 70C.For higher temperatures,Type IIA ovens are necessary.5.1.1 The interior size shall be as follows or of an equivalentvolume:1This 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 D573 04(2010).DOI:10.1520/D0573-04R15.2For 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 Interior size of air oven:min300 by 300 by 300 mm(12 by 12 by 12 in.)max900 by 900 by 1200 mm(36 by 36 by 48 in.)5.1.2 Provision shall be made for suspending specimensvertically without touching each other or the sides of the agingchamber.5.1.3 The heating medium for the aging chamber shall be aircirculated within it at atmospheric pressure.5.1.4 The source of heat is optional but shall be located inthe air supply outside of the aging chamber proper.5.1.5 The temperature should be automatically recordedover the entire test period using a temperature-measuringdevice capable of measuring at the specified temperature tow