21st September, 2023

The 9 COSHH Hazard Symbols (Meanings And What They Look Like)

If you are working with chemicals that are hazardous to health, or completing COSHH risk assessments, you should be aware of the symbols that are included on the packaging of substances, and what they mean. These symbols give you a good indication of the main hazards associated with the substance.

The 9 COSHH Hazard Symbols (Meanings And What They Look Like) header image

Have you ever seen those square orange symbols on bottles and tins like paint and cleaning substances, and wondered what they mean?

Or you might already be familiar with the new diamond black and red COSHH symbols, that replaced the orange symbols in 2017.

Or the new symbols might just have added to the confusion!

The square orange and black COSHH symbols were around for years under the Chemicals (Hazard Information and Packaging for Supply) Regulations - known as CHIP. But they actually started being phased out back in 2009!

The diamond red and black COSHH symbols are newer and were introduced by the European Regulation on the classification, labelling and packaging of substances and mixtures (known as the CLP Regulations).

What do both groups of symbols have in common?

Orange or red. Square or diamond. They are both hazard symbols given to chemicals and substances that are hazardous to health.

Both the CHIP and the CLP Regulations ensure that the hazards are clearly communicated to workers and consumers. On packaging, labelling and datasheets.

Both sets of COSHH symbols were around together for a while. However, the orange symbols were gradually phased out between 2009-2017. And the red diamond symbols officially replaced the orange symbols on the 1st of June 2017.

The new diamond red and black symbols are what you now need to know about, and we are going to cover them in this post.

coshh explosive Explosives
coshh flammable Flammable
coshh oxidising Oxidising
coshh gases Gases under pressure
coshh corrosive Corrosive
coshh toxic Toxic
coshh caution Health hazards
coshh long term Serious health hazards
coshh environment Dangerous for the environment

These names are not the official names given to each symbol. In fact, the regulations give each symbol a range of meanings. So some categories might be known by a couple of names. For example, 'health hazard' is sometimes referred to as 'caution', and 'serious health hazards' are also known as 'long-term health hazards'.

Some of the names are fairly self-explanatory, but some are a little more confusing.

While there are 9 COSHH symbols officially in use today (the current red and black ones), the orange pictograms might still be present in older stock and past material safety data sheets (MSDS). So really, there are 18 COSHH symbols. So to clear things up, we will also look at which orange symbols have been replaced (and removed).

Because it's not just the colour of the COSHH symbols that changed. New meanings were introduced, and some symbols were phased out. If you want to know what changed since the old square orange and black symbols, we will look at that too.

You'll find these symbols placed on the packaging of hazardous substances and safety data sheets. COSHH symbols are there to tell you about the type of hazard a substance presents.

A hazardous substance may be classified as one or more of the following 9 types:


coshh explosive

These are chemicals and preparations that explode. The symbol is a pictogram of an exploding bomb, and it's a straight replacement for the previous explosive classification.



coshh symbol explosive


coshh flammable

Chemicals that may catch fire in contact with air, only need brief contact with an ignition source, have a very low flash point or evolve highly flammable gases in contact with water. This symbol replaces the old classifications of highly flammable and extremely flammable. The symbol is a flame.



coshh symbol highly flammable coshh symbol extremely flammable


coshh oxidising

Oxidising is a classification for chemicals and preparations that react exothermically with other chemicals. The symbol is a flame over a circle. It replaces the previous symbol for oxidising and is usually found on bleach, oxygen for medical purposes, etc.



coshh symbol oxidising

Gas under pressure

coshh gases

Gas is stored under pressure, such as in gas containers. The symbol is a gas cylinder. This is a new symbol that wasn't represented under the old classification system. It's usually found on gas containers.



coshh corrosive

Chemicals that may destroy living tissue on contact. The pictogram shows corrosion of material and skin. This matches the previous symbol for corrosion and is usually found on drain cleaners, acetic acid, hydrochloric acid, ammoniac etc.



coshh symbol corrosive coshh symbol harmful


coshh toxic

Chemicals that cause damage to health at low and very low levels. The symbol is a skull and crossbones and replaces the old classifications of toxic and very toxic.



coshh symbol toxic coshh symbol very toxic coshh symbol harmful

Health Hazard

coshh caution

This symbol is for chemicals that may cause damage to health and is also known to mean caution. The symbol is an exclamation mark. This classification is the closest replacement to the previous harmful and irritant classifications.



coshh symbol harmful

Serious Health Hazard

coshh long term

This classification is also known to mean long-term health hazards. The symbol shows a person with damage. These are chemicals that can cause serious and long-term damage to health.



coshh symbol toxic coshh symbol harmful

Dangerous for the environment

coshh environment

This classification is given to chemicals or substances that may present an immediate or delayed danger to one or more components of the environment. The symbol is a dead tree and fish and the symbol is usually found on pesticides, biocides, petrol, turpentine etc.



coshh symbol dangerous for the environment

Want to help make your team aware of the COSHH symbols and meanings? Download the free COSHH symbols PDF download today.

Because COSHH assessments are a legal requirement, if you are working with chemicals that are hazardous to health, and completing the necessary COSHH risk assessments, you should be aware of these symbols.

These COSHH symbols give you a good indication of the main dangers and risks associated with the substance. They are included on the packaging of substances to guide you as to the type of hazard it is.

Once you have identified the type of hazardous substance used, you can start assessing the risks to those using the substance. This will help you to pick the COSHH control measures you need to minimise those risks to a safe level.

Don't know where to start? Read 9 ways to comply with COSHH or browse through our COSHH assessment templates.

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This article was written by Emma at HASpod. Emma has over 10 years experience in health and safety and BSc (Hons) Construction Management. She is NEBOSH qualified and Tech IOSH.

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