ASTM_D_6546_-_00_2010.pdf

Designation:D654600(Reapproved 2010)Standard Test Methods forand Suggested Limits for Determining Compatibility ofElastomer Seals for Industrial Hydraulic Fluid Applications1This standard is issued under the fixed designation D6546;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.1.Scope1.1 These test methods cover the procedure for measuringphysical properties of elastomer seals in the form of O-ringsafter exposure to industrial hydraulic fluids and thermal aging.The measured properties are then compared to the physicalproperties of elastomer seals that have not been exposed to theindustrial hydraulic fluids and thermal aging.The changes inthese properties form a basis for assessing compatibility whenthese changes are compared against the suggested limits inTable 1.1.2 While these test methods involve the use of O-rings,they can also be used to evaluate the compatibility of theelastomeric compounds of specialty seals with industrial hy-draulic fluids and their resistance to thermal aging.Thecompounds can be molded into O-rings for evaluation pur-poses.1.3 These test methods provide procedures for exposingO-ring test specimens to industrial hydraulic fluids underdefinite conditions of temperature and time.The resultingdeterioration of the O-ring material is determined by compar-ing the changes in work function,hardness,physicalproperties,compression set,and seal volume after immersionin the test fluid to the pre-immersion values.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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.2.Referenced Documents2.1 ASTM Standards:2D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD1414 Test Methods for Rubber O-RingsD2000 Classification System for Rubber Products in Auto-motive ApplicationsD2240 Test Method for Rubber PropertyDurometer Hard-nessD3677 Test Methods for RubberIdentification by InfraredSpectrophotometryD3767 Practice for RubberMeasurement of DimensionsD5028 Test Method for Curing Properties of PultrusionResins by Thermal AnalysisE1131 Test Method for Compositional Analysis by Thermo-gravimetry2.2 SAE Standard:3AS568A O-ring Sizes3.Terminology3.1 Definitions:3.1.1 batchall the O-rings molded from the same lot ofmaterial and presented for inspection at one time.3.1.2 compounda fully formulated elastomer materialcontaining all fillers and cross-linking agents.3.1.3 fluid saturation effectthe absorption of fluid by theelastomer until an equilibrium swell value is reached at aparticular temperature.3.1.4 O-ringa rubber seal of homogeneous compositionmolded in one piece to the configuration of a torus with circularcross section.1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.N0.09 on Compatibility.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 2000.Last previous edition approved in 2005 as D654600(2005).DOI:10.1520/D6546-00R10.2For 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.3Available from Society of Automotive Engineers,400 Commonwealth Drive,Warrendale,PA 15096.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4.1 DiscussionO-rings are used as both dynamic andstatic seals.The size of the O-ring is normally designated by adash number corresponding to the size tables listed inAS568A.The dimensions for the O-rings used in these test methods arelisted in Annex A2.3.1.5 ultimate elongationthe amount of stretch that theO-ring is exposed to before breaking.3.1.6 work functionwork done on a test specimen to cause20%deformation.4.Significance and Use4.1 When more than one elastomer seal material is tested,the test methods yield comparative data on which to basejudgements as to expected service quality.Suggested in-serviceproperty change limits are provided.Property changes beyondthese limits will indicate limited service life of the elastomerseal.4.2 These test methods attempt to simulate service condi-tions through controlled aging and evaluation of propertychanges but may not give any direct correlati