1、Designation:D709719Standard Test Method forDetermination of Moderately High Temperature PistonDeposits by Thermo-Oxidation Engine Oil Simulation TestTEOST MHT1This standard is issued under the fixed designation D7097;the number immediately following the designation indicates the year oforiginal adop
2、tion 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.Scope*1.1 This test method covers the procedure to determine themass of deposit formed o
3、n a specially constructed test rodexposed to repetitive passage of 8.5 g of engine oil over the rodin a thin film under oxidative and catalytic conditions at285 C.The range of applicability of the Moderately HighTemperature Thermo-Oxidation Engine Test(TEOST MHT2)test method as derived from an inter
4、laboratory study isapproximately 10 mg to 100 mg.However,experience indi-cates that deposit values from 1 mg to 150 mg or greater maybe obtained.1.2 This test method uses a patented instrument,method andpatented,numbered,and registered depositor rods traceable tothe manufacturer3and made specificall
5、y for the practice andprecision of the test method.41.3 The values stated in SI units are to be regarded asstandard.1.3.1 Although not an SI unit,the special name liter(L)isallowed by SI for the cubic decimeter(dm3)and the milliliter(mL)for the SI cubic centimeter(cm3).Likewise,the specialname milli
6、meter(mm)is allowed by SI as a measurement oflength.1.4 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,health,and environmental practices and deter-mine the appli
7、cability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by th
8、e World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:5D4485 Specification for Performance of Active API ServiceCategory Engine OilsD6335 Test Method for Determination of High TemperatureDeposits by Thermo-Oxidation Engine Oil SimulationTest3.Te
9、rminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bubble airflow gauge,na precision bore glass tubemarked in tenths of a milliliter used to measure accurately theflow rate of air around and past the depositor rod and tocalibrate mass air flow controllers recommended for use in thepro
10、cedure.3.1.2 depositor rod deposits,nparticulate matter formedon the depositor rod surface by oxidation of the thin film ofpassing oil exposed to the rod temperature and air,and weighedafter appropriate washing and drying to obtain the net massgain.3.1.3 filter deposits,nparticulates washed from the
11、 de-positor rod after the test and collected on a special multi-layerfilter cartridge.3.1.4 TEOST2,nan acronym for Thermo-Oxidation En-gine Oil Simulation Test.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct respons
12、ibility ofSubcommittee D02.09.0G on Oxidation Testing of Engine Oils.Current edition approved Dec.1,2019.Published January 2020.Originallyapproved in 2005.Last previous edition approved in 2016 as D7097 16a.DOI:10.1520/D7097-19.2TEOST and MHT are registered trademarks of the Tannas Co.(Reg.2001396),
13、Tannas Company,4800 James Savage Rd.,Midland,MI 48642.3The sole source of supply of the apparatus known to the committee at this timeis Tannas Company,4800 James Savage Rd.,Midland,MI 48642.If you are awareof alternative suppliers,please provide this information to ASTM InternationalHeadquarters.You
14、r comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.4The TEOST instrument,method and rod are patented.Interested parties areinvited to submit information regarding the identification of an alternative(s)to thispatented technology to
15、ASTM Headquarters.Your comments will receive carefulconsideration at a meeting of the responsible technical committee,1which you mayattend.5For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume inf
16、ormation,refer to the standards Document Summary page onthe ASTM website.*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 T
