ASTM_D_6335_-_09.pdf

Designation:D633509Standard 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 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 to 180 mg total deposits.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 Milligrams(mg),grams(g),millilitres(mL),and litresare the units provided,because they are an industry acceptedstandard.1.2.2 ExceptionProvided psig 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 ceramic isolatorthe 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 rodthe steel rod on which the deposits arecollected.It is resistively heated through a temperature cycleduring the test.2.1.3 depositor rod casingthe sleeve that surrounds thedepositor rod and allows the flow of specimen around theoutside of the rod.2.1.4 drain tubethe tube connecting the outlet of thedepositor rod casing to the reaction chamber.2.1.5 end capthe fitting to tighten the ceramic isolatorsdown onto the O-rings at the ends of the depositor rod casing.2.1.6 filter depositsthe mass in mg of the deposits col-lected on the filter cartridge.2.1.7 pumpthe gear pump that controls the flow rate ofsample through the depositor rod casing.2.1.8 pump inlet tubethe tube connecting the reactorchamber to the pump.2.1.9 pump outlet tubethe tube connecting the pump to thedepositor rod casing.2.1.10 reactor chamberthe reservoir that contains the bulkof the sample throughout the test.It has a drain valve forremoving sample at the end of the test and an inlet valve foradding gases to the sample.The chamber contains a magneticstir bar well in the bottom in which a stir bar is placed to mixthe reactor contents.2.1.11 rod depositsthe mass,in milligrams,of the depositscollected on the depositor rod.2.1.12 rod O-ringsthe O-rings that seal the outside of therod and the depositor rod casing to prevent sample leaks.2.1.13 side nutthe fitting creates a seal to prevent sampleleaking from the front holes of the depositor rod casing.2.1.14 thermocouple lock collara fitting that tightens onthe thermocouple to ensure the thermocouple is at the correctdepth when placed inside the rod.2.1.15 total depositsthe rod deposits plus the filter depos-its.3.Summary of Test Method3.1 A sample of the engine oil at a temperature of 100Cthat contains ferric napthenate and is in contact with nitrousoxide and moist air is pumped at a set flow rate past a tareddepositor rod.The rod is resistively heated through twelve,9.5min temperature cycles that go from 200 to 480C.When 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 June 1,2009.Published July 2009.Originally approvedin 1998.Last previous edition approved in 2003 as D633503b.DOI:10.1520/D6335-09.2TEOST 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.*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 twelve cycle program is complete,the depositor rod rinsed ofoil residue and dried and the gross rod mass obtained.Thesample is flushed from the system and filtered through a taredfilter.The mass of deposits on the rod plus the mass of depositson the filter is the total deposit mass.4.Significance and Use4.1 The test method is designed to predict the high tempera-ture deposit forming tendencies of an engine oil.This tes