1、Designation:E185808(Reapproved 2015)1Standard Test Methods forDetermining Oxidation Induction Time of Hydrocarbons byDifferential Scanning Calorimetry1This standard is issued under the fixed designation E1858;the number immediately following the designation indicates the year oforiginal adoption or,
2、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.1NOTEWarning notes were editorially updated throughout in May 2015.1.Scope1.1 These test methods d
3、escribe the determination of theoxidative properties of hydrocarbons by differential scanningcalorimetry or pressure differential scanning calorimetry and isapplicable to hydrocarbons that oxidize exothermically in theiranalyzed form.1.2 Test Method AA differential scanning calorimeter(DSC)is used a
4、t ambient pressure,for example,about 100 kPaof oxygen.1.3 Test Method BApressure DSC(PDSC)is used at highpressure,for example,3.5 MPa(500 psig)oxygen.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 These test methods are
5、related to ISO 113576 but isdifferent in technical content.These test methods are related toCEC L-85T but includes additional experimental conditions.1.6 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 sta
6、ndard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in 6.4 and 11.10.2.Referenced Documents2.1 ASTM Standards:2D3350 Specification for Polyethylene Plastics Pipe and Fit-tings
7、 MaterialsD3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryD4565 Test Methods for Physical and Environmental Per-formance Properties of Insulations and Jackets for Tele-communications Wire and CableD5482 Test Method for Vapor Pressure of Petroleum Pr
8、od-ucts(Mini MethodAtmospheric)D5885 Test Method for Oxidative Induction Time of Poly-olefin Geosynthetics by High-Pressure Differential Scan-ning CalorimetryD6186 Test Method for Oxidation Induction Time of Lubri-cating Oils by Pressure Differential Scanning Calorimetry(PDSC)E473 Terminology Relati
9、ng to Thermal Analysis and Rhe-ologyE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE967 Test Method for Temperature Calibration of Differen-tial Scanning Calorimeters and Differential Thermal Ana-lyzersE1860 Test Method for Elapsed Time Calibration of
10、 Ther-mal Analyzers2.2 Other Standards:ISO 113576 Plastice-Differential Scanning Calorimetry(DSC)Part 6:Oxidation Induction Time3CEC L-85T Hot Surface Oxidation43.Terminology3.1 Definitions:3.1.1 Specific technical terms used in these test methods aregiven in Terminology E473.4.Summary of Test Metho
11、d4.1 The test specimen in an aluminum pan and the referencealuminum pan are heated to a specified constant test tempera-ture in an oxygen environment.Heat flow out of the specimenis monitored at an isothermal temperature until the oxidative1These test methods are under the direct jurisdiction of Com
12、mittee E37 onThermal Measurements and is the direct responsibility of Subcommittee E37.01 onCalorimetry and Mass Loss.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1997.Last previous edition approved in 2008 as E1858 08.DOI:10.1520/E1858-08R15E01.2For referenced ASTM s
13、tandards,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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New
14、York,NY 10036,http:/www.ansi.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 reaction is manifested by heat evolution on the therma
15、l curve.The oxidative induction time(OIT),a relative measure ofoxidative stability at the test temperature,is determined fromdata recorded during the isothermal test.The OIT measurementis initiated upon reaching the isothermal test temperature.4.2 For some particularly stable materials,the OIT may b
16、equite long(120 min)at the specified elevated temperatures ofthe experiment.Under these circumstances,the OIT may bereduced by increasing the isothermal temperature or increasingthe pressure of oxygen purge gas,or both.Conversely,reac-tions that proceed too rapidly,with a short OIT,may beextended by decreasing the test temperature or reducing thepartial pressure of oxygen,or both.By admixing oxygen gaswith a suitable diluent,for example,nitrogen,the OIT will beincreased(see Test Methods D3895,D4
