AFMAN 24-204(I)/TM 38-250/NAVSUP PUB 505/MCO P4030.19H/ DLAI 4145.3
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11 DECEMBER 2001
demonstrate a negligible probability of accidental initiation or propagation. The risk from these articles is
limited to the explosion of a single article.
Class 2.1 (Flammable Gas)--Any material that is a gas (boiling point) at 20 degrees C (68 degrees F) or less and has
a pressure of 101.3 kPa (14.7 psi), in addition to one of the following properties:
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Is ignitable at 101.3 kPa (14.7 psi) when in a mixture of 13 percent or less by volume with air.
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Has a flammable range of 101.3 kPa (14.7 psi) with air of at least 12 percent regardless of the lower limit.
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The limits specified above shall be determined at 101.3 kPa (14.7 psi) of pressure and a temperature of 20
degrees C (68 degrees F) according to ASTM E681-85 Standard Test Method for Concentration Limits of
Flammability of Chemicals.
Class 2.2 (Nonflammable, Nonpoisonous Compressed Gas, Including Compressed Gas, Liquefied Gas,
Pressurized Cryogenic Gas, and Compressed Gas in Solution)--Any material or mixture which has an absolute
pressure of 280 kPa (41 psia) inside the container at 20 degrees C (68 degrees F) and does not meet the definition of
a Class 2.1 or 2.3.
Class 2.3 (Gas Poisonous by Inhalation)--Any material that is a gas (boiling point) at 20 degrees C (68 degrees F)
or less and has a pressure of 101.3 kPa (14.7 psi), in addition to one of the following properties:
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The material is known to be so toxic to humans as to pose a hazard to health during transportation.
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In the absence of adequate data on human toxicity, the material is presumed to be toxic to humans because
when tested it has an LC50 (inhalation toxicity) value of not more than 5000 parts per million (ppm).
Class 3 (Flammable Liquid)--A flammable liquid is any liquid having a flash point equal to or below 60.5 degrees
C (141 degrees F), except:
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Any liquid meeting the definition of a Class 2 material.
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Any mixture having one or more compounds with a flash point above 60.5 degrees C (141 degrees F) that
makes up at least 99 percent of the total volume of the mixture. Distilled spirits of 140 proof or lower are
considered to have a flash point no lower than 23 degrees C (73 degrees F).
Class 4.1 (Flammable Solids)--Flammable solids consist of solids (other than those classed as explosives) which are
readily combustible under conditions encountered in transport, or may cause or contribute to fire through friction.
Class 4.2 (Spontaneously Combustible Material)--Liquids or solids which are prone to spontaneous heating under
normal conditions encountered in transport or to heating in contact with air, thus being liable to ignite.
Class 4.3 (Dangerous When Wet Material)--Solids that are liable to become spontaneously flammable or emit
flammable gases when they come into contact with water.
Class 5.1 (Oxidizers)--A material that may cause or enhance the combustion of other material, generally by yielding
oxygen.
Class 5.2 (Organic Peroxides)--Any organic compound containing oxygen (O) in the bivalent -O-O- structure, and
which may be considered a derivative of hydrogen peroxide where one or more of the hydrogen atoms have been
replaced by organic radicals. Organic peroxides are thermally unstable substances which may undergo exothermic
self-accelerating decomposition. These substances may be prone to explosive decomposition or rapid burning; be
sensitive to impact or friction; react dangerously with other material; or cause damage to the eyes. A material which
meets this definition must be classed in Class 5.2, unless it also meets the definition of a Class 1 material, or unless
the available oxygen content of an organic peroxide formulation is less than the amount specified (by the percentage
equation) in 49 CFR 173.128.
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Type A: An organic peroxide that can detonate or deflagrate rapidly as packaged for transport.
Transportation of type A organic peroxides is forbidden.
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Type B: An organic peroxide that, as packaged for transport, neither detonates nor deflagrates rapidly, but
can undergo a thermal explosion.
