ASTM_D_6375_-_09_2014.pdf

Designation:D637509(Reapproved 2014)Standard Test Method forEvaporation Loss of Lubricating Oils by ThermogravimetricAnalyzer(TGA)Noack Method1This standard is issued under the fixed designation D6375;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.Scope1.1 This test method covers the procedure for determiningthe Noack evaporation loss of lubricating oils using a thermo-gravimetric analyzer test(TGA).The test method is applicableto base stocks and fully formulated lubricant oils having aNoack evaporative loss ranging from 0 to 30 mass%.Thisprocedure requires much smaller specimens,and is faster whenmultiple samples are sequentially analyzed,and safer than thestandard Noack method using Woods metal.1.2 The evaporative loss determined by this test method isthe same as that determined using the standard Noack testmethods.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D5800 Test Method for Evaporation Loss of LubricatingOils by the Noack MethodD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesE1582 Practice for Calibration of Temperature Scale forThermogravimetry3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Noack reference oilthe oil provided by Noack equip-ment manufacturers to check proper operation of the Noackevaporation tester.3.1.2 Noack reference timethe time(in minutes)requiredfor the Noack reference oil to reach its known Noack evapo-rative loss under the conditions used in this test method.3.1.3 TGA Noack volatilitythe evaporative loss(in masspercent)of a lubricant as determined in this test method.4.Summary of Test Method4.1 A lubricant specimen is placed in an appropriate TGAspecimen pan.The pan is placed on the TGA pan holder andquickly heated to between 247 and 249C under a stream of air,and then held isothermal for an appropriate time.Throughoutthis process,the TGA monitors and records the mass lossexperienced by the specimen due to evaporation.The Noackevaporation loss is subsequently determined from the specimenweight percent loss versus time curve(TG curve)as the masspercent lost by the specimen at the Noack reference timedetermined under the same TGA conditions.5.Significance and Use5.1 This test method is a safe and fast alternative fordetermination of the Noack evaporation loss of a lubricant.5.2 The evaporation loss of a lubricant is important in thehot zones of equipment where evaporation of part of thelubricant may increase lubricant consumption.5.3 Some lubricant specifications cite a maximum allowableevaporative loss.6.Apparatus6.1 Thermogravimetric Analyzer,with the capability tomeet all the conditions required for this test method,along withthe software necessary to complete the required analyses.6.2 Aluminum Specimen PanThis shall be cylindrical,andhave a minimum inside diameter/height ratio of 0.45 and avolume of 50 6 3 L.If the pans provided by the particularTGA manufacturer do not meet these criteria,alternative pans1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.06 on Analysis of Liquid Fuels and Lubricants.Current edition approved May 1,2014.Published July 2014.Originally approvedin 1999.Last previous edition approved in 2009 as D6375 09.DOI:10.1520/D6375-09R14.2For 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 page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 may be used and adapted to fit the pan holder of the TGA.Examples of some of the adaptations used during the evalua-tion of this test method are shown in Fig.1.6.3 Pressure Regulator,capable of maintaining air deliverypressure at the level required by the TGA instrument.6.4 Flowmeter,with a flow control valve capable of settingand measuring the air throughput required by the TGA instru-ment.7.Reagents and Materials7.1 TGA Temperature Calibration StandardsThese mate-rials will depend on the particular TGA apparatus and itscapabiliti