ASTM_D_6335_-_19.pdf

Designation:D633519Standard Test Method forDetermination of High Temperature Deposits by Thermo-Oxidation Engine Oil Simulation Test1This standard is issued under the fixed designation D6335;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.Scope*1.1 This test method covers the procedure to determine theamount of deposits formed by automotive engine oils utilizingthe thermo-oxidation engine oil simulation test(TEOST2).3Aninterlaboratory study(see Section 17)has determined it to beapplicable over the range from 10 mg to 65 mg total deposits.NOTE1Operational experience with the test method has shown thetest method to be applicable to engine oils having deposits over the rangefrom 2 mg to 180 mg total deposits.1.2 The values stated in SI units are to be regarded asstandard.1.2.1 Milligrams(mg),grams(g),milliliters(mL),and litersare the units provided,because they are an industry acceptedstandard.1.2.2 ExceptionPounds per square inch gauge(psig)isprovided for information only in 6.2.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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 the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 ceramic isolator,nthe fitting that compresses theO-ring into the depositor rod casing and isolates the depositorrod casing from the voltage applied to the depositor rod.2.1.2 depositor rod4,na patented,specially made,numbered,and registered steel rod(used once for each test)onwhich the deposits are collected.It is resistively heated througha series of twelve temperature cycles during the test totemperatures established and controlled by a thermocoupleinserted to a pre-determined depth in the hollow rod.2.1.3 depositor rod casing,nthe sleeve that surrounds thedepositor rod and allows the flow of the test oil up and aroundthe outside of the rod at a flow rate such that every volumeelement of the test oil is exposed to the same heating cycle.2.1.4 drain tube,nthe tube connecting the upper outlet ofthe depositor rod casing to the reaction chamber.2.1.5 end cap,nthe fitting to tighten the ceramic isolatorsonto the O-rings at both ends of the depositor rod casing.2.1.6 filter deposits,nthe mass in milligrams of thedeposits collected after test on a special multi-layer filtercartridge used once for each test.2.1.7 pump,nthe gear pump that is used to control theflow rate of the test oil through the depositor rod casing.2.1.8 pump inlet tube,nthe tube connecting the reactorchamber to the pump.2.1.9 pump outlet tube,nthe tube connecting the pump tothe depositor rod casing.2.1.10 reactor chamber,nthe heated reservoir that con-tains the bulk(approximately 100 mL)of the 116 mLof test oilsample circulated past the deposit rod during the test.Thereactor is equipped with a magnetic stir-bar to continuouslymix the chamber contents.2.1.10.1 DiscussionIn the reaction chamber,moist air andnitrous oxide are each bubbled at a controlled rate of3.5 mL min through a channel opening at the bottom of the1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.09.0G on Oxidation Testing of Engine Oils.Current edition approved Dec.1,2019.Published January 2020.Originallyapproved in 1998.Last previous edition approved in 2018 as D6335 18.DOI:10.1520/D6335-19.2TEOST is a trademark of the Tannas Co.(Reg.2001396),Tannas Company,4800 James Savage Rd.,Midland,MI 48642.3The Development of Thermo-Oxidation Engine Oil Simulation Test(TEOST),Society of Automotive Engineers(SAE No.932837),400 Commonwealth Dr.,Warrendale,PA 15096-0001.4The sole source of supply of the apparatus known to the committee at this timeis Tannas Co.,4800 James Savage Rd.,Midland,MI 48642.If you are aware ofalternative suppliers,please provide this information to ASTM InternationalHeadquarters.Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.*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 princip