Chemical Safety Symbols
A
guide to meanings of common chemical safety/hazard symbols (a.k.a.
warning labels, Danger symbols, Chemical safety labels...). These are
the European/international standard; I originaly put them online as they
didn't seem to be anywhere else; they seem to still be popular judging
by the number of people who read this so I've carried them over to
blogger as a bit of a public service... Click on the images to enlarge, for printable label size and suitable for downloading. Feel free to use these pictures.
Poisonous
The
poison symbol is self-explanatory. Whereas most chemicals are fairly
dangerous if ingested or inhaled, many of these are dangerous even on
contact.
Environmental hazard
Relatively rare with laboratory chemicals (most of which pose some environmental hazard if not got rid of correctly), these require particular care to be taken on disposal.
Relatively rare with laboratory chemicals (most of which pose some environmental hazard if not got rid of correctly), these require particular care to be taken on disposal.
Corrosive
Will
destroy or irreversibly damage another substance with which it comes in
contact. The main hazards include damage to eyes, skin and tissue under
the skin, but inhalation or ingestion are also very risky. Avoid contact, and bear in mind that these can (under some ciurcumstances) rust chemical cupboards.
Explosive
Again, fairly self-explanatory, though fairly seldom seen in the average lab. Bear in mind that noise and movement can also trigger explosion (not just sparks/flames!).
Again, fairly self-explanatory, though fairly seldom seen in the average lab. Bear in mind that noise and movement can also trigger explosion (not just sparks/flames!).
Flammable or extremely flammable
Chemicals to be stored in flame-resistant cupboards. Volatile solvents can be a particular problem as they are prone to spread around from unsealed containers. This also covers pyrophoric materials (that catch fire spontaneously on exposure to air).
Chemicals to be stored in flame-resistant cupboards. Volatile solvents can be a particular problem as they are prone to spread around from unsealed containers. This also covers pyrophoric materials (that catch fire spontaneously on exposure to air).
Irritant or HarmfulThis
symbol covers a wide range of (sometimes relatively minor) hazards -
with precautions such as avoid contact with the skin, do not breathe,
etc. - best to refer to relevant data sheet for details.
Oxidising chemical
Oxidising chemicals are materials that spontaneously evolve oxygen at room temperature or with slight heating, or that promote combustion. To be kept away from flammable chemicals at all costs!
Oxidising chemicals are materials that spontaneously evolve oxygen at room temperature or with slight heating, or that promote combustion. To be kept away from flammable chemicals at all costs!
Whereas
the square symbols above (which tend to be the most familiar ones) will
be found on bottles & jars, diamond shaped symbols are used in
transport (mainly as they can be slotted into holders on the backs of
trucks & tankers to identify what the mess is (and how dangerous it
is) in the event of a leak.
Poisonous Gas
Used for transport of a poisonous gas - on gas cylinders, or sometimes as an indicator on vehicles.
Used for transport of a poisonous gas - on gas cylinders, or sometimes as an indicator on vehicles.
Miscellaneous danger
Catch-all symbol for all other dangers (usually specified in the space).
Poison
More general symbol for the transport of poisonous materials (not necessarily a gas).
More general symbol for the transport of poisonous materials (not necessarily a gas).
Flammable Solid
Flammable solid.
Flammable solid.
Stow away from foodstuffs
Harmful material to be kept away from edible material.
Harmful material to be kept away from edible material.
Dangerous when wet
This generally means that it will react fairly violently with water...
This generally means that it will react fairly violently with water...
Flammable Gas
Safety symbol used for the transport or storage of a flammable gas.
Safety symbol used for the transport or storage of a flammable gas.
Non flammable gas
Safety symbol used in the transport of non flammable (and hence often non hazardous, at least out in the open) gases.
Safety symbol used in the transport of non flammable (and hence often non hazardous, at least out in the open) gases.
Organic Peroxide
Chemical safety symbol used in the transport and storage of organic peroxides.
Chemical safety symbol used in the transport and storage of organic peroxides.
Corrosive
The corrosive symbol is used in the transport of corrosive materials - again, avoid contact with the skin.
The corrosive symbol is used in the transport of corrosive materials - again, avoid contact with the skin.
Inhalation Hazard
Inhalation hazard transport/storage symbol.
Inhalation hazard transport/storage symbol.
Marine Pollutant
Marine pollutant - do not dispose of in sewer system.
Marine pollutant - do not dispose of in sewer system.
Explosive
Used in the transport of explosive materials.
Used in the transport of explosive materials.
Spontaneously Combustible
Spontaneously combustible material (treat with great caution!...).
Flammable Liquid
Used in the transport of flammable liquids.
Used in the transport of flammable liquids.
Other good sources for these are the HSE website,
which is very complete and also explains the precise meaning of these
symbols and where they should be used, as well as including common
workplace safety signs. In the US, the NIOSH website includes full safety information for many chemicals and chemical families. Try also the HSE leaflets,
which explain some of the issues relating to chemical transportation
and various aspects of laboratory safety. Above all, remember that this
explanation is for curiosity only - there's no guarantee that any of
this is correct!