Meaning of hazard identification numbers

The hazard identification number consists of two or three figures. In general, the figures indicate the
following hazards:
2 Emission of gas due to pressure or to chemical reaction
3 Flammability of liquids (vapours) and gases or self-heating liquid
4 Flammability of solids or self-heating solid
5 Oxidizing (fire-intensifying) effect
6 Toxicity or risk of infection
7 Radioactivity
8 Corrosivity
9 Risk of spontaneous violent reaction
NOTE: The risk of spontaneous violent reaction within the meaning of figure 9 include the possibility
following from the nature of a substance of a risk of explosion, disintegration and polymerization
reaction following the release of considerable heat or flammable and/or toxic gases.
Doubling of a figure indicates an intensification of that particular hazard.
Where the hazard associated with a substance can be adequately indicated by a single figure,
this is followed by zero.
The following combinations of figures, however, have a special meaning: 22, 323, 333, 362, 382, 423,
44, 446, 462, 482, 539, 606, 623, 642, 823, 842, 90 and 99, see 5.3.2.3.2 below.
If a hazard identification number is prefixed by the letter "X", this indicates that the substance will
react dangerously with water. For such substances, water may only be used by approval of experts.
For substances of Class 1, the classification code in accordance with Column (3 b) of Table A of
Chapter 3.2, shall be used as the hazard identification number. The classification code consists of:
− the division number in accordance with 2.2.1.1.5; and
− the compatibility group letter in accordance with 2.2.1.1.6.

 

The hazard identification numbers listed in Column (20) of table A of Chapter 3.2 have the following
meanings:
20 asphyxiant gas or gas with no subsidiary risk
22 refrigerated liquefied gas, asphyxiant
223 refrigerated liquefied gas, flammable
225 refrigerated liquefied gas, oxidizing (fire-intensifying)
23 flammable gas
238 gas, flammable corrosive
239 flammable gas, which can spontaneously lead to violent reaction
25 oxidizing (fire-intensifying) gas
26 toxic gas
263 toxic gas, flammable
265 toxic gas, oxidizing (fire-intensifying)
268 toxic gas, corrosive
28 gas, corrosive
30 flammable liquid (flash-point between 23 °C and 60 °C, inclusive) or
flammable liquid or solid in the molten state with a flash-point above 60 °C, heated to a
temperature equal to or above its flash-point, or
self-heating liquid
323 flammable liquid which reacts with water, emitting flammable gases
X323 flammable liquid which reacts dangerously with water, emitting flammable gases1
33 highly flammable liquid (flash-point below 23 °C)
333 pyrophoric liquid
X333 pyrophoric liquid which reacts dangerously with water1
336 highly flammable liquid, toxic
338 highly flammable liquid, corrosive
X338 highly flammable liquid, corrosive, which reacts dangerously with water1
339 highly flammable liquid which can spontaneously lead to violent reaction
36 flammable liquid (flash-point between 23 °C and 60 °C, inclusive), slightly toxic, or
self-heating liquid, toxic
362 flammable liquid, toxic, which reacts with water, emitting flammable gases
X362 flammable liquid toxic, which reacts dangerously with water, emitting flammable gases1
368 flammable liquid, toxic, corrosive
38 flammable liquid (flash-point between 23 °C and 60 °C, inclusive), slightly corrosive or
self-heating liquid, corrosive
382 flammable liquid, corrosive, which reacts with water, emitting flammable gases
1 Water not to be used except by approval of experts.
 
X382 flammable liquid, corrosive, which reacts dangerously with water, emitting flammable
gases1
39 flammable liquid, which can spontaneously lead to violent reaction
40 flammable solid, or self-reactive substance, or self-heating substance, or polymerizing
substance
423 solid which reacts with water, emitting flammable gases, or flammable solid which
reacts with water, emitting flammable gases or self-heating solid which reacts with
water, emitting flammable gases
X423 solid which reacts dangerously with water, emitting flammable gases, or flammable
solid which reacts dangerously with water, emitting flammable gases, or self-heating
solid which reacts dangerously with water, emitting flammable gases1
43 spontaneously flammable (pyrophoric) solid
X432 spontaneously flammable (pyrophoric) solid which reacts dangerously with water,
emitting flammable gases1
44 flammable solid, in the molten state at an elevated temperature
446 flammable solid, toxic, in the molten state, at an elevated temperature
46 flammable or self-heating solid, toxic
462 toxic solid which reacts with water, emitting flammable gases
X462 solid which reacts dangerously with water, emitting toxic gases1
48 flammable or self-heating solid, corrosive
482 corrosive solid which reacts with water, emitting flammable gases
X482 solid which reacts dangerously with water, emitting corrosive gases1
50 oxidizing (fire-intensifying) substance
539 flammable organic peroxide
55 strongly oxidizing (fire-intensifying) substance
556 strongly oxidizing (fire-intensifying) substance, toxic
558 strongly oxidizing (fire-intensifying) substance, corrosive
559 strongly oxidizing (fire-intensifying) substance, which can spontaneously lead to
violent reaction
56 oxidizing substance (fire-intensifying), toxic
568 oxidizing substance (fire-intensifying), toxic, corrosive
58 oxidizing substance (fire-intensifying), corrosive
59 oxidizing substance (fire-intensifying) which can spontaneously lead to violent reaction
60 toxic or slightly toxic substance
606 infectious substance
623 toxic liquid, which reacts with water, emitting flammable gases
63 toxic substance, flammable (flash-point between 23 °C and 60 °C, inclusive)
638 toxic substance, flammable (flash-point between 23 °C and 60 °C, inclusive), corrosive
639 toxic substance, flammable (flash-point not above 60 °C) which can spontaneously lead
to violent reaction
64 toxic solid, flammable or self-heating
642 toxic solid, which reacts with water, emitting flammable gases
65 toxic substance, oxidizing (fire-intensifying)
66 highly toxic substance
663 highly toxic substance, flammable (flash-point not above 60 °C)
664 highly toxic solid, flammable or self-heating
665 highly toxic substance, oxidizing (fire-intensifying)
668 highly toxic substance, corrosive
X668 highly toxic substance, corrosive, which reacts dangerously with water1
669 highly toxic substance which can spontaneously lead to violent reaction
68 toxic substance, corrosive
69 toxic or slightly toxic substance, which can spontaneously lead to violent reaction
70 radioactive material
768 radioactive material, toxic, corrosive
78 radioactive material, corrosive
80 corrosive or slightly corrosive substance
X80 corrosive or slightly corrosive substance, which reacts dangerously with water1
1 Water not to be used except by approval of experts.
823 corrosive liquid which reacts with water, emitting flammable gases
83 corrosive or slightly corrosive substance, flammable (flash-point between 23 °C and
60 °C, inclusive)
X83 corrosive or slightly corrosive substance, flammable, (flash-point between 23 °C and
60 °C, inclusive), which reacts dangerously with water1
839 corrosive or slightly corrosive substance, flammable (flash-point between 23 °C and
60 °C inclusive) which can spontaneously lead to violent reaction
X839 corrosive or slightly corrosive substance, flammable (flash-point between 23 °C and
60 °C inclusive), which can spontaneously lead to violent reaction and which reacts
dangerously with water1
84 corrosive solid, flammable or self-heating
842 corrosive solid which reacts with water, emitting flammable gases
85 corrosive or slightly corrosive substance, oxidizing (fire-intensifying)
856 corrosive or slightly corrosive substance, oxidizing (fire-intensifying) and toxic
86 corrosive or slightly corrosive substance, toxic
88 highly corrosive substance
X88 highly corrosive substance, which reacts dangerously with water1
883 highly corrosive substance, flammable (flash-point between 23 °C and 60 °C inclusive)
884 highly corrosive solid, flammable or self-heating
885 highly corrosive substance, oxidizing (fire-intensifying)
886 highly corrosive substance, toxic
X886 highly corrosive substance, toxic, which reacts dangerously with water1
89 corrosive or slightly corrosive substance, which can spontaneously lead to violent
reaction
90 environmentally hazardous substance; miscellaneous dangerous substances
99 miscellaneous dangerous substance carried at an elevated temperature.

 

Elevated temperature substance mark

Tank-vehicles, tank-containers, portable tanks, special vehicles or containers or specially equipped
vehicles or containers containing a substance that is carried or handed over for carriage in a liquid
state at or above 100 °C or in a solid state at or above 240 °C shall bear on both sides and at the rear
for vehicles, and on both sides and at each end for containers, tank-containers and portable tanks, the
mark shown in Figure 5.3.3.
 
 
The mark shall be an equilateral triangle. The colour of the mark shall be red. The minimum
dimension of the sides shall be 250 mm. Where dimensions are not specified, all features shall be in
approximate proportion to those shown. For tank-containers or portable tanks with a capacity of not
more than 3 000 litres and with an available surface area insufficient to affix the prescribed marks, the
minimum dimensions of the sides may be reduced to 100 mm.
1 Water not to be used except by approval of experts.

 

(Reserved)

(Reserved)

Environmentally hazardous substance mark

When a placard is required to be displayed in accordance with the provisions of section 5.3.1,
containers, MEGCs, tank-containers, portable tanks and vehicles containing environmentally
hazardous substances meeting the criteria of 2.2.9.1.10 shall be marked with the environmentally
hazardous substance mark shown in 5.2.1.8.3.

The environmentally hazardous substance mark for containers, MEGCs, tank-containers, portable
tanks and vehicles shall be as described in 5.2.1.8.3 and Figure 5.2.1.8.3, except that the minimum
dimensions shall be 250 mm x 250 mm. For tank-containers or portable tanks with a capacity of not
more than 3 000 litres and with an available surface area insufficient to affix the prescribed marks, the
minimum dimensions may be reduced to 100 mm x 100 mm. The other provisions of section 5.3.1
concerning placards shall apply mutatis mutandis to the mark.

General

5.4

DOCUMENTATION

Unless otherwise specified, any carriage of goods governed by ADR shall be accompanied by the
documentation prescribed in this Chapter, as appropriate.
NOTE: For the list of documentation to be carried on board transport units, see 8.1.2.

The use of electronic data processing (EDP) or electronic data interchange (EDI) techniques as an aid
to or instead of paper documentation is permitted, provided that the procedures used for the capture,
storage and processing of electronics data meet the legal requirements as regards the evidential value
and availability of data during transport in a manner at least equivalent to that of paper documentation.

When the dangerous goods transport information is given to the carrier by EDP or EDI techniques, the
consignor shall be able to give the information to the carrier as a paper document, with the
information in the sequence required by this Chapter.

Dangerous goods transport document and related information

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