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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, 

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414 

49 CFR Ch. I (10–1–23 Edition) 

§ 172.332 

§ 172.328, § 172.330, or § 172.331, identifica-
tion number markings must be dis-
played on orange panels or placards as 
specified in this section, or on white 
square-on-point configurations as pre-
scribed in § 172.336(b). 

(b) 

Orange panels. 

Display of an iden-

tification number on an orange panel 
shall be in conformance with the fol-
lowing: 

(1) The orange panel must be 160 mm 

(6.3 inches) high by 400 mm (15.7 inches) 
wide with a 15 mm (0.6 inches) black 
outer border. The identification num-
ber shall be displayed in 100 mm (3.9 
inches) black Helvetica Medium nu-
merals on the orange panel. Measure-
ments may vary from those specified 
plus or minus 5 mm (0.2 inches). 

(2) The orange panel may be made of 

any durable material prescribed for 
placards in § 172.519, and shall be of the 
orange color specified for labels or 
placards in appendix A to this part. 

(3) The name and hazard class of a 

material may be shown in the upper 
left border of the orange panel in let-
ters not more than 18 points (0.25 in.) 
high. 

(4) Except for size and color, the or-

ange panel and identification numbers 
shall be as illustrated for Liquefied pe-
troleum gas: 

(c) 

Placards. 

Display of an identifica-

tion number on a hazard warning 

placard shall be in conformance with 
the following: 

(1) The identification number shall 

be displayed across the center area of 
the placard in 88 mm (3.5 inches) black 
Alpine Gothic or Alternate Gothic No. 
3 numerals on a white background 100 
mm (3.9 inches) high and approxi-
mately 215 mm (8.5 inches) wide and 
may be outlined with a solid or dotted 
line border. 

(2) The top of the 100 mm (3.9 inches) 

high white background shall be ap-
proximately 40 mm (1.6 inches) above 
the placard horizontal center line. 

(3) An identification number may be 

displayed only on a placard cor-
responding to the primary hazard class 
of the hazardous material. 

(4) For a COMBUSTIBLE placard 

used to display an identification num-
ber, the entire background below the 
white background for the identifica-
tion number must be white during 
transportation by rail and may be 
white during transportation by high-
way. 

(5) The name of the hazardous mate-

rial and the hazard class may be shown 
in letters not more than 18 points high 
immediately within the upper border of 
the space on the placard bearing the 
identification number of the material. 

(6) If an identification number is 

placed over the word(s) on a placard, 
the word(s) should be substantially 
covered to maximize the effectiveness 
of the identification number. 

(d) 

Example. 

Except for size and color, 

the display of an identification number 
on a placard shall be as illustrated for 
Acetone: 

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415 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.334 

[Amdt. 172–101, 45 FR 74667, Nov. 10, 1980, as 
amended by Amdt. 172–81, 48 FR 28099, June 
20, 1983; Amdt. 172–110, 52 FR 29527, Aug. 10, 
1987; Amdt. 172–123, 55 FR 52593, Dec. 21, 1990; 
56 FR 66255, Dec. 20, 1991; Amdt. 172–151, 62 
FR 1228, Jan. 8, 1997; 65 FR 50459, Aug. 18, 
2000; 68 FR 57632, Oct. 6, 2003; 87 FR 79772, 
Dec. 27, 2022] 

§ 172.334

Identification numbers; pro-

hibited display. 

(a) No person may display an identi-

fication number on a RADIOACTIVE, 
EXPLOSIVES 1.1, 1.2, 1.3, 1.4, 1.5 or 1.6, 
DANGEROUS, or subsidiary hazard 
placard. 

(b) No person may display an identi-

fication number on a placard, orange 
panel or white square-on-point display 
configuration unless— 

(1) The identification number is spec-

ified for the material in § 172.101; 

(2) The identification number is dis-

played on the placard, orange panel or 
white square-on-point configuration 
authorized by § 172.332 or § 172.336(b), as 
appropriate, and any placard used for 
display of the identification number 
corresponds to the hazard class of the 
material specified in § 172.504; 

(3) Except as provided under § 172.336 

(c)(4) or (c)(5), the package, freight con-
tainer, or transport vehicle on which 
the number is displayed contains the 
hazardous material associated with 
that identification number in § 172.101. 

(c) Except as required by 

§ 172.332(c)(4) for a combustible liquid, 
the identification number of a material 
may be displayed only on the placards 
required by the tables in § 172.504. 

(d) Except as provided in § 172.336, a 

placard bearing an identification num-
ber may not be used to meet the re-
quirements of subpart F of this part 
unless it is the correct identification 
number for all hazardous materials of 
the same class in the transport vehicle 
or freight container on which it is dis-
played. 

(e) Except as specified in § 172.338, an 

identification number may not be dis-
played on an orange panel on a cargo 
tank unless affixed to the cargo tank 
by the person offering the hazardous 
material for transportation in the 
cargo tank. 

(f) If a placard is required by § 172.504, 

an identification number may not be