ASTM E2046-08

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E2046–03 Designation: E 2046 – 08
Standard Test Method for
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Reaction Induction Time by Thermal Analysis
This standard is issued under the fixed designation E 2046; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method describes the measurement of Reaction Induction Time (RIT) of chemical materials that undergo
exothermic reactions with an induction period. The techniques and apparatus described may be used for solids, liquids, or slurries
of chemical substances. The temperature range covered by this test method is typically from ambient to 400°C. This range may
be extended depending upon the apparatus used.
1.2 The RIT is a relative index value, not an absolute thermodynamic property. As an index value, the RIT value may change
depending upon experimental conditions. A comparison of RIT values may be made only for materials tested under similar
conditions of apparatus, specimen size, and so forth. Furthermore, the RIT value may not predict behavior of large quantities of
material.
1.3 The RIT shall not be used by itself to establish a safe operating temperature. It may be used in conjunction with other test
methods (for example, E 487, E 537, and E1981 and E 1981) as part of a hazard analysis of a particular operation.
1.4 This test method may be used for RIT values greater than 15 min (as relative imprecision increases at shorter periods).
1.5 This test method is used to study catalytic and autocatalytic reactions. These reactions depend upon time as well as
temperature. Such reactions are often studied by fixing one experimental parameter (that is, time or temperature) and then
measuring the other parameter (that is, temperature or time). This test method measures time to reaction onset detection under
isothermal conditions. It is related to Test Method E 487 that measures detected reaction onset temperature under constant time
conditions
1.6 SI units are the standard.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.7 There is no ISO standard equivalent to this test method.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of
regulatory limitations prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D 3350 Specification for Polyethylene Plastics Pipe and Fittings Materials
D 3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry
D 4565 Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunica-
tions Wire and Cable
D 5483 Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
D 6186 Test Method for Oxidation Induction Time of Lubricating Oils by Pressure Differential Scanning Calorimetry (PDSC)
E 473 Terminology Relating to Thermal Analysis and Rheology
E 487 Test Method for Constant-Temperature Stability ofOf Chemical Materials
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E 537TestMethodforAssessingtheThermalStabilityofChemicalsbyMethodsofDifferentialThermalAnalysis TestMethod
for The Thermal Stability Of Chemicals By Differential Scanning Calorimetry
E 967Practice Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal
Analyzers
E 968 Practice for Heat Flow Calibration of Differential Scanning Calorimeters
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ThistestmethodisunderthejurisdictionofASTMCommitteeE27onHazardPotentialofChemicalsandisthedirectresponsibilityofSubcommitteeE27.02onThermal
Stability and Condensed Phases.
Current edition approved July 10, 2003. Published September 2003. Originally approved in 1999. Last previous edition approved in 1999 as E2046–99.
Current edition approved April 1, 2008. Published June 2008. Originally approved in 1999. Last previous edition approved in 2003 as E 2046 – 03.
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Annual Book of ASTM Standards, Vol 08.02.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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