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Fire Extinguisher Types and Classes
The six main fire extinguisher types are water, foam, CO2, powder, water mist and wet chemical.
Each of the different types of fire extinguisher is suitable for different fire classes. It is important that you purchase the right fire extinguisher for your needs.
| Type | Class A | Class B | Class C | Class D | Electrical | Class F |
|---|---|---|---|---|---|---|
| Solid combustibles (such as wood, paper & textiles) |
Flammable liquids (such as petrol, diesel & paraffin) |
Flammable gases (such as methane, propane & hydrogen) |
Flammable metals (such as magnesium, aluminium & lithium) |
Electricals (such as computers & electric heaters) |
Cooking oil (such as deep fat fryers & chip pans) |
|
| Water |  |
 |
|
|
Only if di-electrically tested | |
| Water Mist | |
|
|
|
|
* |
| Carbon Dioxide (CO2) | |
|
|
|
|
|
| ABC Powder | |
|
|
|
|
|
| Wet Chemical | Sometimes | |
|
|
|
|
| AFFF Foam | |
|
|
|
Only if di-electrically tested | |
*We do not recommend using water mist on anything above a 5F rated fire (this is equivalent to an average domestic deep fat fryer).
Fire Extinguisher Colour Codes
Fire extinguishers meeting BS EN3 should have a red body (RAL 3000) and an agent-specific colour code band covering between 5-10% of the surface relating to the extinguisher's contents. See the boxes below to find out what the different fire extinguisher colours mean.
WATER
Water fire extinguishers have a red label and a class A rating. They are suitable for fighting fires involving solid combustibles such as wood, paper and textiles.
A few models are safe on electrical equipment if di-electrically tested. Otherwise, care must be taken near electrical equipment.
Fire Classification
DE-IONISED WATER MIST
De-ionised water mist fire extinguishers have a white label and are highly effective on class A, B, C and burning electrical equipment.
Some water mist extinguishers are also certified for class F fires, however we do not recommend using water mist on anything above a 5F rated fire (equivalent to a domestic deep fat fryer).
Fire Classification
CARBON DIOXIDE (CO2)
CO2 fire extinguishers have a black label. They were originally designed for use on flammable liquid fires and therefore have a class B fire rating.
They can be used on electrical fires, as CO2 is not a conductor and they do not leave behind any harmful residue.
Fire Classification
ABC POWDER
ABC powder extinguishers have a blue label. They are versatile and can be used on class A, class B, class C and electrical fires.
However, there is a risk of inhalation when using powder extinguishers indoors. Powder fire extinguishers are therefore not recommended for use within small rooms, homes and offices. Limited to engine rooms and outdoors machinery.
Fire Classification
WET CHEMICAL
Wet chemical fire extinguishers have a yellow label and are designed specifically for use on fires involving combustible cooking media such as burning oil and fat.
They have a class F rating and a special lance applicator nozzle. They usually have an additional class A rating and are normally not designed for use on class B fires (petrol, diesel, paint, paraffin etc), although the 3ltr Gloria wet chemical fire extinguisher is an exception.
Fire Classification
AFFF FOAM
Now discontinued, AFFF foam fire extinguishers have a cream label and are highly effective on class A and class B fires (the foam agent helps to prevent re-ignition).
If foam extinguishers have been dielectrically tested they can be used on electrical appliances.
Fire Classification
Service-Free Fire Extinguishers (P50)
P50 fire extinguishers are service-free and last twice the lifespan of a traditional fire extinguisher as they are designed to prevent corrosion, denting, pressure loss and chemical ageing of the fire extinguishing agent. For more information, please see our P50 information guides.
Still not sure which type you need?
Read our extinguishers by location and extinguishers for vehicles guides for help choosing the correct extinguishers for your requirements.
Reviewed: 28/02/2023 (doc:2 V1.6). Our articles are reviewed regularly. However, any changes made to standards or legislation following the review date will not have been considered. Please note that we provide abridged, easy-to-understand guidance. To make detailed decisions about your fire safety provisions, you might require further advice or need to consult the full standards and legislation.