Commercial Driver Handbook ( PDF ) - California Department of ...

hAzARD clASS
and DIVISIOn
CLASS 1—EXPLOSIVES
APPenDIx A—tABle OF hAzARD clASS DeFInItIOnS
DeFInItIOn
Division 1.1 Explosives that have a mass explosion hazard (affects lmost the entire load instantaneously).
(Refer to 49 CFR 173.50(b)(1).)
Division 1.2 Explosives that have a projection hazard but not a mass explosion hazard. (Refer to 49 CFR
173.50 (b)(2).)
Division 1.3 Explosives that have a fire hazard and either a minor blast or projection hazard or both, but
not a mass explosion hazard. (Refer to 49 CFR 173.50 (b)(3).)
Division 1.4 Explosives that present a minor explosion hazard (effects are largely confined to the package).
(Refer to 49 CFR 173.50 (b)(4).)
Division 1.5 Explosives that are very insensitive (very little probability of detonation under normal
transport condition). (Refer to 49 CFR 173.50 (b)(5).)
Division 1.6 Articles which do not have a mass explosive hazard (negligible probability of accidental
detonation). (Refer to 49 CFR 173.50 (b)(6).)
CLASS 2—GASES
Division 2.1 Flammable gas is any material which is a gas at 20°C (68°F) or less and 101.3 kPa (14.7 psi)
of pressure and is ignitable when mixed with air. (Refer to 49 CFR 173.115(a).)
Division 2.2 Division 2.2 includes non-flammable, non-poisonous compressed gas including compressed
gas, liquefied gas, pressurized cryogenic gas and compressed gas in solution, asphyxiant
gas, or oxidizing gas with an absolute pressure of 280 kpa (40.6 PSIA) or greater at 20°C
(68°F). (Refer to 49 CFR 173.115(b).)
Division 2.3 A gas poisonous by inhalation is a gas which is known to be so toxic to humans as to pose
a hazard to health during transportation. (Refer to 49 CFR 173.115(c).)
CLASS 3—FLAMMABLE LIQUIDS
A flammable liquid means a liquid having a flash point of not more than 60.5°C (141°F), or any material in a
liquid phase with a flash point at or above 37.8°C (100°F) that is intentionally heated and offered for transport, or
transported at or above its flash point in a bulk package, with the following exceptions:
Any liquid meeting one of the definitions specified in 49 CFR 173.115 (gases).
Any mixture having one or more components with a flash point of 60.5°C (141°F) or higher, that makes up at
least 99% of the total volume of the mixture, if the mixture is not offered for transportation or transported at or
above its flash point.
CLASS 4—FLAMMABLE SOLIDS
Division 4.1 A flammable solid means any of the following three types of material:
1. Desensitized Explosives that: A) when dry are explosives Class 1 other than those of
compatibility group A, which are wetted with sufficient water, alcohol, or plasticizer to
suppress explosive properties; and B) are specifically authorized by name and hazard class
by the Associate Administrator for Hazard ous Materials under the provisions of an exemption
issued under subchapter A of 49 CFR or an approval issued under 49 CFR 173.56(i).
2. Self-reactive materials are materials that are liable to undergo, at normal or elevated
temperature, a strong exothermal decomposition caused by excessively high transport
temperatures or by contamination, even without participation of oxygen (air).
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