NYC 9/11 Public Portal Document
Hazardous Material Definitions
The following definitions have been abstracted from the Code of Federal Regulations, Title 49 Tr3nsportation, Parts 100
to 199. Refer to the refererreed sections for complete details.
NOTE: Rulemaking proposals are outstanding or are contemplated concerning some of these definitions.
Hazardous Material - Means a substance or material which has been determined by the Secretary of Transportation to be
capable of posing an unreasonable risk to health, safety and property, when transported in commerce, and which has been so
designated. (Sec. 171.8)
Multiple Hazards - A material meeting the definitions of more than one hazard class is classed according to the sequence
given in Sec. 173.2 .
HAZARD CLASS DEFINITIONS
EXPLOSIVES An Explosive - Any chemical compound, mixture or device, the primary or common puipose of
which is to function by explosion, i.e., with substantially instantaneous release of gas and heat, unless
such compound, mixture or device is otherwise specifically classified in Parts 170-189. (Sec. 173.50)
CLASS A Detonating or otherwise of maximum hazard. The nine types of Class A explosives are defined in Sec.
EXPLOSIVE 173.53.
CLASS B In general, function by rapid combustion rather than detonation and include some explosive devices
EXPLOSIVE such as special fireworks, flash powders, etc. Flammable hazard. (Sec. 173.88)
CLASS C Certain types of manufactured articles containing Class A or Class B explosives, or both, as compo
EXPLOSIVE nents but in restricted quantities, and certain types of fireworks. Minimum hazard. (Sec. 173.100)
BLASTING A material designed for blasting which has been tested in accordance with Sec. 173.114a(b) and
AGENTS found to be so insensitive that there is very little probability of accidental initiation to explosion or
of transition from deflagration to detonation. (Sec. 173.114a(a))
COMBUSTIBLE Any liquid having a flash point above 100°F. and below 200°F. as determined by tests listed in Sec.
LIQUID 173.115(d). Exceptions to this arc found in Sec. 173.115(b).
CORROSIVE Any liquid or solid that causes visible destruction of human skin tissue or a liquid that has a severe
MATERIAL corrosion rate on steel. See Sec. 173.240(a) and (b) for details.
FLAMMABLE Any liquid having a flash point below 100°F. as determined by tests listed in Sec. 173.115(d). Excep
LIQUID tions are listed in Sec. 173.115(a).
COMPRESSED Compressed Gas • Any material or mixture having in the container a pressure exceeding 40 psia at
GAS 70°F., or a pressure exceeding 104 psia at 130°F.; or any liquid flammable material having a vapor
pressure exceeding 40 psia at 100°F. (Sec. 173.300(a) >
FLAMMABLE Any compressed gas meeting the requirements for lower flammability limit, flammability limit range,
GAS flame projection, or flame propagation criteria as specified in Sec. 173.300(b).
NONFLAMMABLE Any compressed gas other than a flammable compressed gas.
GAS
FLAMMABLE Any solid material, other than an explosive, which is liable to cause fires through friction, retained
SOLID heat from manufacturing or processing, or which can be ignited readily and when ignited burns so
vigorously and persistently as to create a serious transportation hazard. (Sec. 173.150)
ORGANIC An organic compound containing the bivalent -0-0 structure and which may be considered a deriva
PEROXIDE tive of hydrogen peroxide where one or more of the hydrogen atoms have been replaced by organic
radicals must be classed as an organic peroxide unless...(See Sec. 173.151(a) for details)
OXIDIZER A substance such as chlorate, permanganate, inorganic peroxide, or a nitrate, that yields oxygen readi
ly to stimulate the combustion of organic matter. (Sec Sec. 173.151)
POISON A Extremely Dangerous Poisons - Poisonous gases or liquids of such nature that a very small amount of
(Poison Gat) the gas, or vapor of the liquid, mixed with air is dangerous to life. (Sec. 173.326)
POISON B Less Dangerous Poisons - Substances, liquids, or solids (including pastes and semi-solids), other than
(Poison) Class A or Irritating materials, which are known to be so toxic to man as to afford a hazard to health
during transportation; or which, in the absence of adequate data on human toxicity, are presumed to
be toxic to man. (Sec. 173343)
IRRITATING A liquid or solid substance which upon contact with fire or when exposed to air gives off dangerous
MATERIAL or intensely irritating fumes, but not including any poisonous material, Clea A, (Sec. 173.381)
ETIOLOGIC An "etiologic agent" means a viable micro-organism, or its toxin which causes or may cause human
AGENT disease. (Sec. 173386) (Refer to the Department of Health, Education and Welfare Regulations, Title
42, CFR, Sec. 7235(c) for details.)_________________________________________________________
RADIOACTIVE Any material, or combination of materials, that spontaneously emits ionizing radiation, and having a
MATERIAL specific activity greater than 0.002 microcuries per gram. (Sec. 173.389) NOTE: See Sec. 173.389(a)
through (1) for details._________________________________________________________________
WATER REACTIVE Means any solid substance (including sludges and pastes) which, by interaction with water, is likely to
MATERIAL become spontaneously flammable or to give off flammable or toxic gases in dangerous quantities.
(SOLID)
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