Standard Terminology Relating to Hazardous Potential of Chemicals

SCOPE
1.1 This standard is a compilation of terminology used in the area of hazard potential of chemicals. Terms that are generally understood or adequately defined in other readily available sources are not included.
1.2 Although some of these definitions are general in nature, many must be used in the context of the standards in which they appear. The pertinent standard number is given in parentheses after the definition.
1.3 In the interest of common understanding and standardization, consistent word usage is encouraged to help eliminate the major barrier to effective technical communication.

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Historical
Publication Date
09-Jul-2003
Current Stage
Ref Project

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ASTM E1445-03 - Standard Terminology Relating to Hazardous Potential of Chemicals
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E 1445–03
Standard Terminology Relating to
1
Hazard Potential of Chemicals
This standard is issued under the fixed designation E 1445; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope E1232 TestMethodforTemperatureLimitofFlammability
2
of Chemicals
1.1 This standard is a compilation of terminology used in
E1491 Test Method for Minimum Autoignition Tempera-
the area of hazard potential of chemicals. Terms that are
2
ture of Dust Clouds
generally understood or adequately defined in other readily
E1515 Test Method for Minimum Explosible Concentra-
available sources are not included.
2
tion of Combustible Dusts
1.2 Althoughsomeofthesedefinitionsaregeneralinnature,
E2012 Guide for the Preparation of a Binary Chemical
many must be used in the context of the standards in which
2
Compatibility Chart
they appear. The pertinent standard number is given in paren-
E2019 Test Method for Minimum Ignition Energy of a
theses after the definition.
2
Dust Cloud in Air
1.3 In the interest of common understanding and standard-
E2021 Test Method for Hot-Surface Ignition Temperature
ization, consistent word usage is encouraged to help eliminate
2
of Dust Layers
the major barrier to effective technical communication.
E2046 Test Method for Feaction Induction Time by Ther-
2
2. Referenced Documents mal Analysis
2.1 ASTM Standards:
3. Terminology
E476 Test Method for Thermal Instability of Confined
2
3.1 Definitions:
Condensed Phase Systems (Confinement Test)
E487 Test Method for Constant-Temperature Stability of
adiabatic decomposition temperature rise, (T) , n—an esti-
d
2
Chemical Materials
mation of the computed temperature which a specimen
E537 Test Method for Assessing the Thermal Stability of
would attain if all of the enthalpy (heat) of decomposition
2
Chemicals by Methods of Thermal Analysis
reaction were to be absorbed by the sample itself. High
E659 Test Method forAutoignition Temperature of Liquid
values represent high hazard potential. (E 1231)
2
Chemicals
anvil, n—the smooth, hardened surface upon which the test
E680 Test Method for Drop Weight Impact Sensitivity of
sample or cup containing the sample rests. (E 680)
2
−E/RT
Solid-Phase Hazardous Materials
Arrhenius equation—k= Ze where k is the specific
E681 Test Method for Concentration Limits of Flammabil-
reaction rate constant in reciprocal minutes for first order, Z
2
ity of Chemicals (Vapors and Gases)
is the pre-exponential factor in reciprocal minutes, E is the
E698 Test Method for Arrhenius Kinetic Constants for
Arrhenius activation energy in J/mol, R is the gas constant,
2
Thermally Unstable Materials
8.32 J/mol K, and T is the temperature in kelvin. (E 698)
E771 Test Method for Spontaneous Heating Tendency of
autoignition, n—the ignition of a material commonly in air as
2
Materials
the result of heat liberation due to an exothermic oxidation
E918 Practice for Determining Limits of Flammability of
reactionintheabsenceofanexternalignitionsourcesuchas
2
Chemicals at Elevated Temperature and Pressure
a spark or flame. (E 659)
E1226 Test Method for Pressure and Rate of Pressure Rise
autoignition temperature, n—the minimum temperature at
2
for Combustible Dusts
which autoignition occurs under the specified conditions of
E 1231 Practice for Calculation of Hazard Potential
test. (E 659)
2
Figures-of-Merit for Thermally Unstable Materials
DISCUSSION—Autoignition temperature is also referred to as sponta-
neous ignition temperature, self-ignition temperature, autogenous igni-
1
tion temperature, and by the acronymsAIT and SIT.AIT is the lowest
ThisterminologyisunderthejurisdictionofASTMCommitteeE27onHazard
Potential of Chemicals and is the direct responsibility of Subcommittee E27.01 on temperature at which the substance will produce hot-flame ignition in
Editorial and Nomenclature. airatatmosphericpressurewithouttheaidofanexternalenergysource
Current edition approved July 10, 2003. Published September 2003. Originally
such as spark or flame. It is the lowest temperature to which a
approved in 1991. Last previous edition approved in 2002 as E1445–02.
combustible mixture must be raised, so that the rate of heat evolved by
2
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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E 1445–03
the exothermic oxidation reaction will over-balance the rate at which
controlled temperature program. (E 698)
heat is lost to the surroundings and cause ignition.
(dP/dt) , n—the maximum rate of pressure rise d
...

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