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The upper number is used to identify the danger posed by the goods being transported. It is called the hazard identification number (Kemler number) consists of 2 or 3 digits, if necessary preceded by the letter "X".
The lower number is the UN number (4 digits), which indicates the type of goods being transported.
Hazard Labelling
The hazard identification number consists of two or three digits for substances of classes 2 to 9. The digits generally indicate the following hazards:
| 2 | Escape of gas by pressure or by chemical reaction |
| 3 | Flammability of liquid substances (vapours) and gases or self-heating liquid substance |
| 4 | Flammability of solid substances or self-heating solid substance |
| 5 | Oxidising (fire-promoting) effect |
| 6 | Toxicity or infectiousness |
| 7 | Radioactivity |
| 8 | Corrosivity |
| 9 | Miscellaneous dangerous substances and articles, risk of spontaneous violent reaction |
The doubling of a digit indicates the increase of the corresponding hazard. If the hazard of a substance can be sufficiently indicated by a single digit, a zero is added to this digit. There are also other combinations of digits with special meaning. If the hazard identification number is preceded by the letter "X", this means that the substance reacts dangerously with water. For such substances, water may only be used with the agreement of experts.
For Class 1 Explosives, a classification code is additionally used as a number to identify the hazard. The classification code consists of the number of the subclass and the letter of the compatibility group.
The numbers have the following meaning:
| 20 | Asphyxiant gas or gas with no subsidiary hazard |
| 22 | Refrigerated liquefied gas, asphyxiant |
| 23 | Flammable gas |
| 223 | Refrigerated liquefied gas, flammable |
| 225 | Refrigerated liquefied gas, oxidizing (fire-intensifying) |
| 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 |
| 285 | Aerosols, corrosive, oxidizing |
| 30 | 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 gases (water not to be used except by approval of experts) |
| 33 | Highly flammable liquid (flash-point below 23 °C) |
| 333 | Pyrophoric liquid |
| X333 | Pyrophoric liquid which reacts dangerously with water (water not to be used except by approval of experts) |
| 336 | Highly flammable liquid, toxic |
| 338 | Highly flammable liquid, corrosive |
| X338 | Highly flammable liquid, corrosive, which reacts dangerously with water (water not to be used except by approval of experts) |
| 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 gases (water not to be used except by approval of experts) |
| 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 |
| X382 | Flammable liquid, corrosive, which reacts dangerously with water, emitting flammable gases (water not to be used except by approval of experts) |
| 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 |
| X432 | Solid which reacts dangerously with water, emitting flammable gases, or flammable solid wich reacts dangerously with water, emitting flammable gases or self-heating solid wich reacts dangerously with water, emitting flammable gases (water not to be used except by approval of experts) |
| 43 | Spontaneously flammable (pyrophoric) solid |
| X432 | Spontaneously flammable (pyrophoric) solid which reacts dangerously with water, emitting flammable gases (water not to be used except by approval of experts) |
| 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 gases (water not to be used except by approval of experts) |
| 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 gases (water not to be used except by approval of experts) |
| 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 water (water not to be used except by approval of experts) |
| 669 | Highly toxic substance which can spontaneously lead to violent reaction |
| 68 | Toxic substance, corrosive |
| 687 | Toxic substance, corrosive, radioactive |
| 69 | Toxic or slightly toxic substance, which can spontaneously lead to violent reaction |
| 70 | Radioactive material |
| 768 | Radioactive material, toxic, corrosive |
| 78 | Radioactive material, toxic |
| 80 | Corrosive or slightly corrosive substance |
| X80 | Corrosive or slightly corrosive substance, which reacts dangerously with water (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 water (water not to be used except by approval of experts) |
| 836 | Corrosive or slightly corrosive substance, flammable (flash-point between 23ºC and 60ºC, inclusive) and toxic |
| 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 water (water not to be used except by approval of experts) |
| 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 water (water not to be used except by approval of experts) |
| 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 water (water not to be used except by approval of experts) |
| 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 |
Labelling of the goods to be transported
You can find the complete list of UN numbers here:
