| Description | This entry applies to liquids, pastes or powders, pressurized
with a propellant that meets the definition of a gas in Sec. 173.115.
A chemical under pressure packaged in an aerosol dispenser must be
transported under UN1950. The chemical under pressure must be classed
based on the hazard characteristics of the components in the
propellant; the liquid; or the solid. The following provisions also
apply:
- a. If one of the components, which can be a pure substance or a
mixture, is classed as flammable, the chemical under pressure must be
classed as flammable in Division 2.1. Flammable components are
flammable liquids and liquid mixtures, flammable solids and solid
mixtures or flammable gases and gas mixtures meeting the following
criteria:
- (1) A flammable liquid is a liquid having a flashpoint of not more
than 93 [deg]C (200[emsp14][deg]F);
- (2) A flammable solid is a solid that meets the criteria in Sec.
173.124 of this subchapter; or
- (3) A flammable gas is a gas that meets the criteria in Sec.
173.115 of this subchapter.
- b. Gases of Division 2.3 and gases with a subsidiary risk of 5.1
must not be used as a propellant in a chemical under pressure.
- c. Where the liquid or solid components are classed as Division
6.1, Packing Group II or III, or Class 8, Packing Group II or III, the
chemical under pressure must be assigned a subsidiary risk of Division
6.1 or Class 8 and the appropriate identification number must be
assigned. Components classed as Division 6.1, Packing Group I, or Class
8, Packing Group I, must not be offered for transportation and
transported under this description.
- d. A chemical under pressure with components meeting the properties
of: Class 1 (explosives); Class 3 (liquid desensitized explosives);
Division 4.1 (self-reactive substances and solid desensitized
explosives); Division 4.2 (substances liable to spontaneous
combustion); Division 4.3 (substances which, in contact with water,
emit flammable gases or toxic gases); Division 5.1 (oxidizing
substances); Division 5.2 (organic peroxides); Division 6.2 (Infectious
substances); or, Class 7 (Radioactive material), must not be offered
for transportation under this description.
- e. A description to which special provision 170 or TP7 is assigned
in Column 7 of the Sec. 172.101 Hazardous Materials Table, and
therefore requires air to be eliminated from the package vapor space by
nitrogen or other means, must not be offered for transportation under
this description.
- f. Chemicals under pressure containing components forbidden for
transport on both passenger and cargo aircraft in Columns (9A) and (9B)
of the Sec. 172.101 Hazardous Materials Table must not be transported
by air.
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