1、Designation:E200908(Reapproved 2014)1Standard Test Methods forOxidation Onset Temperature of Hydrocarbons byDifferential Scanning Calorimetry1This standard is issued under the fixed designation E2009;the number immediately following the designation indicates the year oforiginal adoption or,in the ca
2、se 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 March 2014.1.Scope1.1 These test methods describe
3、 the determination of theoxidative properties of hydrocarbons by differential scanningcalorimetry or pressure differential scanning calorimetry underlinearheatingrateconditionsandareapplicabletohydrocarbons,which oxidize exothermically in their analyzedform.1.2 Test Method AA differential scanning c
4、alorimeter(DSC)is used at ambient pressure,of one atmosphere ofoxygen.1.3 Test Method BApressure DSC(PDSC)is used at highpressure,for example,3.5 MPa(500 psig)oxygen.1.4 Test Method CA differential scanning calorimeter(DSC)is used at ambient pressure of one atmosphere of air.1.5 The values stated in
5、 SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 standard to establish appro-priate safety and health p
6、ractices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3350 Specification for Polyethylene Plastics Pipe and Fit-tings MaterialsD3895 Test Method for Oxidative-Induction Time of Poly-olefins by Differential Scanning CalorimetryD456
7、5 Test Methods for Physical and Environmental Per-formance Properties of Insulations and Jackets for Tele-communications Wire and CableD5483 Test Method for Oxidation Induction Time of Lubri-cating Greases by Pressure Differential Scanning Calorim-etryE473 Terminology Relating to Thermal Analysis an
8、d 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-lyzersE1858 Test Method for Determining Oxidation InductionTime of Hydrocarbons
9、by Differential Scanning Calorim-etry3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,refer to Terminology E473.3.1.1 oxidation(extrapolated)onset temperature(OOT)arelative measure of oxidative stability at the cited heating rateis determined from data recorded during a
10、 DSC scanningtemperature test.The temperature at which the onset to theobserved oxidation is taken as the OOT.4.Summary of Methods4.1 The test specimen in an aluminum container and anempty reference aluminum container or pan are heated at aspecified constant heating rate in an oxygen(or air)environ-
11、ment.Heat flow out of the specimen is monitored as a functionof temperature until the oxidative reaction is manifested byheat evolution on the thermal curve.The oxidation(extrapo-lated)onset temperature(OOT),a relative measure of oxida-tive stability at the cited heating rate,is determined from data
12、recorded during the scanning temperature test.The OOTmeasurement is initiated upon reaching the exothermic reactionand measuring the extrapolated onset temperature.4.2 For some particularly stable materials,the OOT may bequite high(300C)at the specified heating rate of theexperiment.Under these circ
13、umstances,the OOT may be1These test methods are under the jurisdiction of ASTM Committee E37 onThermal Measurements and are the direct responsibility of Subcommittee E37.01 onCalorimetry and Mass Loss.Current edition approved March 15,2014.Published April 2014.Originallyapproved in 1999.Last previou
14、s edition approved in 2008 as E2009 08.DOI:10.1520/E2009-08R14E01.2For 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.
15、Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 reduced by increasing the pressure of oxygen purge gas.Conversely,reducing the partial pressure of oxygen(such as bythe use of air)may retard reactions that proceed too rapidly,with a corres
16、ponding increase of the OOT.By admixingoxygen gas with a suitable diluent,for example,nitrogen,theOOT will be increased(see Specification D3350 and TestMethods D3895,D4565,and D5483).NOTE1For some systems,the use of copper pans to catalyzeoxidation will reduce the oxidation onset temperature.The results,however,will not necessarily correlate with non-catalyzed tests.5.Significance and Use5.1 Oxidation onset temperature is a relative measure of thedegree of oxidative stability of the material eva
