ASTM_E_1860_-_13.pdf

Designation:E186013Standard Test Method forElapsed Time Calibration of Thermal Analyzers1This standard is issued under the fixed designation E1860;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 describes the calibration or perfor-mance confirmation of the elapsed-time signal from thermalanalyzers.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 There is no ISO standard equivalent to this test method.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:2D3350 Specification for Polyethylene Plastics Pipe and Fit-tings 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 CableD5483 Test Method for Oxidation Induction Time of Lubri-cating Greases by Pressure Differential Scanning Calorim-etryE473 Terminology Relating to Thermal Analysis and Rhe-ologyE487 Test Method for Constant-Temperature Stability ofChemical MaterialsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1142 Terminology Relating to Thermophysical PropertiesE1858 Test Method for Determining Oxidation InductionTime of Hydrocarbons by Differential Scanning Calorim-etryE1868 Test Method for Loss-On-Drying by Thermogravim-etryE2161 Terminology Relating to Performance Validation inThermal Analysis3.Terminology3.1 Definitions:3.1.1 The technical terms used in this test method aredefined in Terminologies E473,E1142,and E2161,includingcalibration,conformance,relative standard deviation,and ther-mal analysis.4.Summary of Test Method4.1 The elapsed time signal generated by a thermal analyzeris compared to a clock(or timer)whose performance is knownand traceable to a national metrology institute.The thermalanalyzer may be said to be in conformance,if the performanceof the thermal analyzer is within established limits.Alternatively,the elapsed time signal may be calibrated usinga two point calibration method.5.Significance and Use5.1 Most thermal analysis experiments are carried out underincreasing temperature conditions where temperature is theindependent parameter.Some experiments,however,are car-ried out under isothermal temperature conditions where theelapsed time to an event is measured as the independentparameter.Isothermal Kinetics(Test Methods E2070),ThermalStability(Test Method E487),Oxidative Induction Time(OIT)(Test Methods D3895,D4565,D5483,E1858,and Specifica-tion D3350 and Loss-on-Drying(Test Method E1868)arecommon examples of these kinds of experiments.5.2 Modern scientific instruments,including thermalanalyzers,usually measure elapsed time with excellent preci-sion and accuracy.In such cases,it may only be necessary toconfirm the performance of the instrument by comparison to asuitable reference.Only rarely will it may be required tocorrect the calibration of an instruments elapsed time signalthrough the use of a calibration factor.5.3 It is necessary to obtain elapsed time signal conformityonly to 0.1 times the repeatability relative standard deviation1This test method is under the jurisdiction ofASTM Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.10 onFundamental,Statistical and Mechanical Properties.Current edition approved Sept.15,2013.Published September 2013.Originallyapproved in 1997.Last previous edition approved in 2007 as E1860 07.DOI:10.1520/E1860-13.2For 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(standard deviation divided by the mean value)expressed as apercent for the test method in which the thermal analyzer is tobe used.For those test methods listed in Section 2 thisconformity is 0.1%.6.Apparatus6.1 Timer or Stopwatch,with timing capacity of at least 3 h(10 800 s),a resolution of 0.1 s or better and an accuracy of 1.5s per day which performance has been verified using standardsand procedures traceable to a national metrology institute(suchas the National Institute of Standards and Technology(NIST).Such timers are available from most laboratory equipment