ASTM_D_7216_-_18.pdf

Designation:D721618Standard Test Method forDetermining Automotive Engine Oil Compatibility withTypical Seal Elastomers1This standard is issued under the fixed designation D7216;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.INTRODUCTIONAny properly equipped laboratory,without outside assistance,can use the test method described inthis standard.However,the ASTM Test Monitoring Center(TMC)2provides a reference oil(TMC1006-1)and an assessment of the test results obtained with this oil and the reference elastomers.Bythese means,the laboratory will know whether their use of the test method gives results statisticallysimilar to those obtained by other laboratories.The TMC also uses the reference oil results on different batches of elastomers from differentlaboratories to update continually the total and within-laboratory standard deviation estimates.Somespecifications,for example,Specification D4485,use the updated TMC standard deviation estimates,pertaining at the time test oils are evaluated,to adjust specification limits for the effects of the industrytest variability.Various agencies require that a laboratory utilize the TMC services in seeking qualification of oilsagainst specifications.For example,the U.S.Army imposes such a requirement in connection withseveral Army engine lubricating oil specifications.Accordingly,this test method is written for use by laboratories that utilize the TMC services.Laboratories that choose not to use those services may simply ignore those portions of the test methodthat refer to the TMC.This test method may be modified by means of information letters issued by the TMC.In addition,the TMC may issue supplementary memoranda related to this test method.1.Scope*1.1 This test method covers quantitative procedures for theevaluation of the compatibility of automotive engine oils withseveral reference elastomers typical of those used in the sealingmaterials in contact with these oils.Compatibility is evaluatedby determining the changes in volume,Durometer A hardness,and tensile properties when the elastomer specimens areimmersed in the oil for a specified time and temperature.1.2 Effective sealing action requires that the physical prop-erties of elastomers used for any seal have a high level ofresistance to the liquid or oil in which they are immersed.When such a high level of resistance exists,the elastomer issaid to be compatible with the liquid or oil.NOTE1The user of this test method should be proficient in the use ofTest Methods D412(tensile properties),D471(effect of rubber immersionin liquids),D2240(Durometer hardness),and D5662(gear oil compat-ibility with typical oil seal elastomers),all of which are involved in theexecution of the operations of this test method.1.3 This test method provides a preliminary or first orderevaluation of oil/elastomer compatibility only.Because sealsmight be subjected to static or dynamic loads,or both,and theycan operate over a range of conditions,a complete evaluationof the potential sealing performance of any elastomer-oilcombination in any service condition usually requires testsadditional to those described in this test method.1.4 The several reference elastomer formulations specifiedin this test method were chosen to be representative of thoseused in both heavy-duty diesel engines(detailed in Annex A1)and passenger-car spark-ignition engines(the latter are coveredin Annex A2).The procedures described in this test methodcan,however,also be used to evaluate the compatibility ofautomotive engine oils with different elastomer types/1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.B0.07 on Development and Surveillance of Bench TestsMethods.Current edition approved April 1,2018.Published April 2018.Originallyapproved in 2005.Last previous edition approved in 2017 as D7216 17.DOI:10.1520/D7216-18.2Until the next revision of this test method,the ASTM Test Monitoring Centerupdates changes in the test method by means of information letters.Informationletters can be obtained from the ASTM Test Monitoring Center,6555 Penn Avenue,Pittsburgh,PA 15206.(www.astmtmc.cmu.edu)Attention:Administrator.Thisedition incorporates revisions in all information letters through No.17-4.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Org