1、Designation:D709716aStandard 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 ado
2、ption 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
3、on 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 inte
4、rlaboratory 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 specifical
5、ly 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 mill
6、imeter(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 and health practices and determine the applica-bility of r
7、egulatory limitations prior to use.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.Terminology3.1 Definitions of Terms
8、 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 theprocedure.3.1.2 depositor rod deposi
9、ts,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 de-positor rod after the test an
10、d collected on a special multi-layerfilter cartridge.3.1.4 TEOST2,nan acronym for Thermo-Oxidation En-gine Oil Simulation Test.3.1.5 total rod deposits,nthe mass of deposits collectedon the depositor rod plus any mass of deposits washed from thedepositor rod and later extracted on a filter.3.1.6 vol
11、atilized oil,noil vapor coalesced on the mantlewall,and subsequently collected in a vial.3.2 Abbreviations:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.09.0G on Oxidation Testing
12、 of Engine Oils.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 2005.Last previous edition approved in 2016 as D7097 16.DOI:10.1520/D7097-16A.2TEOST and MHT are registered trademarks of the Tannas Co.(Reg.2001396),Tannas Company,4800 James Savage Rd.,Midland,MI 48
13、642.3The 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.Your comments will receive careful consideration at a
14、 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 ASTM Headquarters.Your comments will receive caref
15、ulconsideration 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 information,refer to the standards Document Summary p
16、age 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 States1 3.2.1 MHT2,nmoderately high temperature.3.2.1.1 DiscussionThe TEOST MHT procedure evaluatesdeposit formation at temperatures that are closely related tothose of the piston ring zone in reciprocating engines(asdistinguished from the much higher temperatures associatedwith the TEOST 33C,Test Method D633
