Pipeline and Haz. Matls. Safety Admin., DOT
N77 For materials of not more than two
percent active ingredients by weight, packagings need not conform to the requirements of part 178 of this subchapter, if liquid contents are absorbed in an inert material.
N78 Packages consisting of inner glass,
earthenware, or polyethylene or other nonfragile plastic bottles or jars not over 0.5
kg (1.1 pounds) capacity each, or metal
cans not over five pounds capacity each,
packed in outer wooden boxes, barrels or
kegs, or fiberboard boxes are authorized
and need not conform to the requirements
of part 178 of this subchapter. Net weight
of contents in fiberboard boxes may not exceed 29 kg (64 pounds). Net weight of contents in wooden boxes, barrels or kegs may
not exceed 45 kg (99 pounds).
N79 Packages consisting of tightly closed
metal inner packagings not over 0.5 kg (1.1
pounds) capacity each, packed in outer
wooden or fiberboard boxes, or wooden barrels, are authorized and need not conform
to the requirements of part 178 of this subchapter. Net weight of contents may not
exceed 15 kg (33 pounds).
N80 Packages consisting of one inner metal
can, not over 2.5 kg (5.5 pounds) capacity,
packed in an outer wooden or fiberboard
box, or a wooden barrel, are authorized and
need not conform to the requirements of
part 178 of this subchapter.
N82 See Section 173.115 of this subchapter for classification criteria for flammable aerosols.
N83 This material may not be transported
in quantities of more than 11.5 kg (25.4 lbs)
per package.
N84 The maximum quantity per package is
500 g (1.1 lbs.).
N85 Packagings certified at the Packing
Group I performance level may not be
used.
N86 UN pressure receptacles made of aluminum alloy are not authorized.
N87 The use of copper valves on UN pressure
receptacles is prohibited.
N88 Any metal part of a UN pressure receptacle in contact with the contents may not
contain more than 65% copper, with a tolerance of 1%.
N89 When steel UN pressure receptacles are
used, only those bearing the  - H -  mark are
authorized.
N90 Metal packagings are not authorized.
Packagings of other material with a small
amount of metal, for example metal closures or other metal fittings such as those
mentioned in part 178 of this subchapter,
are not considered metal packagings.
Packagings of other material constructed
with a small amount of metal must be designed such that the hazardous material
does not contact the metal.
N91 The use of a non specification siftproof, non-bulk, metal can with or without
lid, or a non specification sift-proof, non-

Section 172.102

bulk fiber drum, with or without lid is authorized when transporting coal tar pitch
compounds by motor vehicle or rail
freight. The fiber drum must to be fabricated with a three ply wall, as a minimum. The coal tar pitch compound must
be in a solid mass during transportation.
N92 Notwithstanding the provisions of
Section 173.24(g) of this subchapter, packagings
shall be designed and constructed to permit the release of gas or vapor to prevent
a build-up of pressure that could rupture
the packagings in the event of loss of stabilization.
N95 UN1075, Liquefied petroleum gas and
UN1978, Propane authorized for transport
in DOT 4BA240 cylinders is not subject to
the UN identification number and proper
shipping name marking or the label requirements of this part subject to the following conditions:
a. The cylinder must be transported in a
closed motor vehicle displaying FLAMMABLE GAS placards in accordance with
subpart F of part 172 of this subchapter.
b. Shipping papers at all times must reflect
a correct current accounting of all cylinders both full and expended.
c. The cylinders are collected and transported by a private or a contract carrier
for reconditioning, reuse or disposal.

(6)  - R -  codes. These provisions apply
only to transportation by rail.
R1 A person who offers for transportation tank cars containing sulfur,
molten or residue of sulfur, molten
may reference the Sulfur Institute-s,
 - Molten Sulphur Rail Tank Car Guidance document -  (see Section 171.7 of this subchapter) to identify tank cars that may
pose a risk in transportation due to the
accumulation of formed, solid sulfur on
the outside of the tank.
(7)  - T -  codes. (i) These provisions
apply to the transportation of hazardous materials in UN portable tanks.
Portable tank instructions specify the
requirements applicable to a portable
tank when used for the transportation
of a specific hazardous material. These
requirements must be met in addition
to the design and construction specifications in part 178 of this subchapter.
Portable tank instructions T1 through
T22 specify the applicable minimum
test pressure, the minimum shell
thickness (in reference steel), bottom
opening requirements and pressure relief requirements. Liquefied compressed gases are assigned to portable
tank instruction T50. Refrigerated liquefied gases that are authorized to be

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