ASTM_E_2046_-_14.pdf

Designation:E204614Standard Test Method forReaction Induction Time by Thermal Analysis1This standard is issued under the fixed designation E2046;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 measurement of ReactionInduction Time(RIT)of chemical materials that undergoexothermic reactions with an induction period.The techniquesand apparatus described may be used for solids,liquids,orslurries of chemical substances.The temperature range coveredby this test method is typically from ambient to 400C.Thisrange may be extended depending upon the apparatus used.1.2 The RIT is a relative index value,not an absolutethermodynamic property.As an index value,the RIT value maychange depending upon experimental conditions.A compari-son of RIT values may be made only for materials tested undersimilar conditions of apparatus,specimen size,and so forth.Furthermore,the RIT value may not predict behavior of largequantities of material.1.3 The RIT shall not be used by itself to establish a safeoperating temperature.It may be used in conjunction withother test methods(for example,E487,E537,and E1981)aspart of a hazard analysis of a particular operation.1.4 This test method may be used for RIT values greaterthan 15 min(as relative imprecision increases at shorterperiods).1.5 This test method is used to study catalytic,autocatalytic,and accelerating reactions.These reactions depend upon timeas well as temperature.Such reactions are often studied byfixing one experimental parameter(that is,time or tempera-ture)and then measuring the other parameter(that is,tempera-ture or time).This test method measures time to reaction onsetdetection under isothermal conditions.It is related to TestMethod E487 that measures detected reaction onset tempera-ture under constant time conditions1.6The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 There is no ISO standard equivalent to this test method.1.8This 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 consult andestablish appropriate safety and health practices and deter-mine the applicability 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-etryD6186 Test Method for Oxidation Induction Time of Lubri-cating Oils by Pressure Differential Scanning Calorimetry(PDSC)E473 Terminology Relating to Thermal Analysis and Rhe-ologyE487 Test Method for Constant-Temperature Stability ofChemical MaterialsE537 Test Method for The Thermal Stability of Chemicalsby Differential Scanning CalorimetryE967 Test Method for Temperature Calibration of Differen-tial Scanning Calorimeters and Differential Thermal Ana-lyzersE968 Practice for Heat Flow Calibration of DifferentialScanning CalorimetersE1445 Terminology Relating to Hazard Potential of Chemi-calsE1858 Test Method for Determining Oxidation InductionTime of Hydrocarbons by Differential Scanning Calorim-etryE1860 Test Method for Elapsed Time Calibration of Ther-mal Analyzers1This test method is under the jurisdiction of ASTM Committee E27 on HazardPotential of Chemicals and is the direct responsibility of Subcommittee E27.02 onThermal Stability and Condensed Phases.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1999.Last previous edition approved in 2008 as E2046 08.DOI:10.1520/E2046-14.2For 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 E1981 Guide for Assessing Thermal Stability of Materialsby Methods of Accelerating Rate CalorimetryE2070 Test Method for Kinetic Parameters by DifferentialScanning Calorimetry Using Isothermal Methods3.Terminology3.1 The specialized terms used in this test method aredescribed in Terminologies E473 and E1445,including differ-ential scanning calorimetry,differential thermal analysis,ex-trapolated onset value,first-deviation-from-baseline,onsetvalue,isothermal,and reaction.3.2 Definitions of Terms Specific to Thi