Hazard pictograms form part of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Two sets of pictograms are included within the GHS: one for the labelling of containers and for workplace hazard warnings, and a second for use during the transport of dangerous goods. Either one or the other is chosen, depending on the target audience, but the two are not used together.[1] The two sets of pictograms use the same symbols for the same hazards, although certain symbols are not required for transport pictograms. Transport pictograms come in wider variety of colours and may contain additional information such as a subcategory number.
Hazard pictograms are one of the key elements for the labelling of containers under the GHS, along with:[2]
an identification of the product;
a signal word – either DANGER or WARNING – where necessary
hazard statements, indicating the nature and degree of the risks posed by the product
precautionary statements, indicating how the product should be handled to minimize risks to the user (as well as to other people and the general environment)
the identity of the supplier (who might be a manufacturer or importer)
Reproductive toxicity – effects on or via lactation
no pictogram required
Environmental hazards
Usage
Acute hazards to the aquatic environment, category 1
Chronic hazards to the aquatic environment, categories 1, 2
Environmentally Damaging
Usage
Acute hazards to the aquatic environment, categories 2, 3
Chronic hazards to the aquatic environment, categories 3, 4
no pictogram required
Transport pictograms
Class 1: Explosives
Usage
Explosives
Division 1.1: Substances and articles which have a mass explosion hazard
Division 1.2: Substances and articles which have a projection hazard but not a mass explosion hazard
Division 1.3: Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard
Note
The asterisks are replaced by the class number and compatibility code
Divisions 1.1–1.3
Usage
Explosives
Substances and articles which are classified as explosives but which present no significant hazard
Note
The asterisk is replaced by the compatibility code
Division 1.4
Usage
Explosives
Very insensitive substances which have a mass explosion hazard
Note
The asterisk is replaced by the compatibility code
incomplete
Division 1.5
Usage
Explosives
Extremely insensitive articles which do not have a mass explosion hazard
Note
The asterisk is replaced by the compatibility code
Division 1.6
Class 2: Gases
Usage
Flammable gases
Gases which at 20 °C and a standard pressure of 101.3 kPa:
are ignitable when in a mixture of 13 per cent or less by volume with air; or
have a flammable range with air of at least 12 percentage points regardless of the lower flammable limit.
Note
The symbol, number and border line may be shown in white instead of black
Division 2.1
Usage
Non-flammable non-toxic gases
Gases which:
are asphyxiant – gases which dilute or replace the oxygen normally in the atmosphere; or
are oxidizing – gases which may, generally by providing oxygen, cause or contribute to the combustion of other material more than air does; or
do not come under the other divisions;
Note
The symbol, number and border line may be shown in white instead of black
Division 2.2
Usage
Toxic gases
Gases which:
are known to be so toxic or corrosive to humans as to pose a hazard to health; or
are presumed to be toxic or corrosive to humans because they have an LC50 value equal to or less than 5000 ml/m3 (ppm).
Division 2.3
Classes 3 and 4: Flammable liquids and solids
Usage
Flammable liquids
Liquids which have a flash point of less than 60 °C and which are capable of sustaining combustion
Note
The symbol, number and border line may be shown in white instead of black
Class 3
Usage
Flammable solids, self-reactive substances and solid desensitized explosives
Solids which, under conditions encountered in transport, are readily combustible or may
cause or contribute to fire through friction; self-reactive substances which are liable to
undergo a strongly exothermic reaction; solid desensitized explosives which may explode
if not diluted sufficiently
Division 4.1
Usage
Substances liable to spontaneous combustion
Substances which are liable to spontaneous heating under normal conditions encountered
in transport, or to heating up in contact with air, and being then liable to catch fire
Division 4.2
Usage
Substances which in contact with water emit flammable gases
Substances which, by interaction with water, are liable to become spontaneously
flammable or to give off flammable gases in dangerous quantities
Note
The symbol, number and border line may be shown in white instead of black
Division 4.3
Other GHS transport classes
Usage
Oxidizing substances
Substances which, while in themselves not necessarily combustible, may, generally by
yielding oxygen, cause, or contribute to, the combustion of other material
Division 5.1
Usage
Organic peroxides
Organic substances which contain the bivalent –O–O– structure and may be considered
derivatives of hydrogen peroxide, where one or both of the hydrogen atoms have been
replaced by organic radicals
Note
The symbol and upper border line may be shown in white instead of black