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413 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.332 

Hydrogen cyanide, stabilized (less than 3% 

water) 

Hydrogen fluoride, anhydrous 
Hydrogen peroxide, aqueous solutions (great-

er than 20% hydrogen peroxide) 

Hydrogen peroxide, stabilized 
Hydrogen peroxide and peroxyacetic acid 

mixtures 

Nitric acid (other than red fuming) 
Phosphorus, amorphous 
Phosphorus, white dry 

or 

Phosphorus, white, 

under water 

or 

Phosphorus white, in solu-

tion, 

or 

Phosphorus, yellow dry 

or 

Phos-

phorus, yellow, under water 

or 

Phosphorus, 

yellow, in solution 

Phosphorus white, molten 
Potassium nitrate and sodium nitrate mix-

tures 

Potassium permanganate 
Sulfur trioxide, stabilized 
Sulfur trioxide, uninhibited 

(2) In a multi-unit tank car tank, un-

less the tank is marked on two oppos-
ing sides, in letters and numerals no 
less than 50 mm (2.0 inches) high— 

(i) With the proper shipping name 

specified for the material in the 
§ 172.101 table or with a common name 
authorized for the material in this sub-
chapter (e.g., ‘‘Refrigerant Gas’’); and 

(ii) With the identification number 

specified for the material in the 
§ 172.101 table, unless marked in accord-
ance with §§ 172.302(a) and 172.332 of this 
subpart. 

(b) A motor vehicle or rail car used 

to transport a multi-unit tank car 
tank containing a hazardous material 
must be marked on each side and each 
end, as required by § 172.332, with the 
identification number specified for the 
material in the § 172.101 table. 

(c) No person may offer for transpor-

tation or transport a tank car or 
multi-unit tank car tank containing 
unodorized liquefied petroleum gas 
(LPG) unless it is legibly marked NON- 
ODORIZED or NOT ODORIZED on two 
opposing sides near the marked proper 
shipping name required by paragraphs 
(a)(1) and (2) of this section, or near the 
placards. The NON-ODORIZED or NOT 
ODORIZED marking may appear on a 
tank car or multi-unit tank car tank 

used for both unodorized and odorized 
LPG. 

[Amdt. 172–123, 55 FR 52593, Dec. 21, 1990, as 
amended at 56 FR 66255, Dec. 20, 1991; 57 FR 
45458, Oct. 1, 1992; Amdt. 172–148, 61 FR 28676, 
June 5, 1996; Amdt. 172–148, 61 FR 50254, Sept. 
25, 1996; 66 FR 33425, June 21, 2001; 69 FR 
64471, Nov. 4, 2004; 81 FR 35540, June 2, 2016; 
85 FR 83380, Dec. 21, 2020] 

§ 172.331

Bulk packagings other than 

portable tanks, cargo tanks, tank 
cars and multi-unit tank car tanks. 

(a) Each person who offers a haz-

ardous material to a motor carrier for 
transportation in a bulk packaging 
shall provide the motor carrier with 
the required identification numbers on 
placards or plain white square-on-point 
display configurations, as authorized, 
or shall affix orange panels containing 
the required identification numbers to 
the packaging prior to or at the time 
the material is offered for transpor-
tation, unless the packaging is already 
marked with the identification number 
as required by this subchapter. 

(b) Each person who offers a bulk 

packaging containing a hazardous ma-
terial for transportation shall affix to 
the packaging the required identifica-
tion numbers on orange panels, square- 
on-point configurations or placards, as 
appropriate, prior to, or at the time 
the packaging is offered for transpor-
tation unless it is already marked with 
identification numbers as required by 
this subchapter. 

(c) For a bulk packaging contained in 

or on a transport vehicle or freight 
container, if the identification number 
marking on the bulk packaging (e.g., 
an IBC) required by § 172.302(a) is not 
visible, the transport vehicle or freight 
container must be marked as required 
by § 172.332 on each side and each end 
with the identification number speci-
fied for the material in the § 172.101 
table. 

[Amdt. 172–123, 55 FR 52593, Dec. 21, 1994, as 
amended by Amdt. 172–151, 62 FR 1228, Jan. 8, 
1997; 62 FR 39398, July 22, 1997] 

§ 172.332

Identification number mark-

ings. 

(a) 

General. 

When required by 

§ 172.301, § 172.302, § 172.313, § 172.326,