A Comprehensive Guide to Fire Extinguisher Colours and Colour Codes in the UK

Ensuring you have the correct equipment to extinguish fires is a crucial aspect of any building’s fire safety. In the UK, fire extinguishers are colour-coded to help users quickly identify the right type of fire extinguisher to use for different fires. In this guide, we take you through the UK’s fire extinguisher colour code, the various types of fire extinguishers and their appropriate uses.

The UK Fire Extinguisher Colour Code System

The UK follows a specific colour-coding system for fire extinguishers. This system uses colours on both the body and the label to indicate the type of extinguishing agent on the inside. 

In the UK, the colour of all fire extinguishers is red, specially named signal red. A coloured panel on the label is used to differentiate between the various types of fire extinguishers. This labelling system allows users to easily identify where fire extinguishers are located and the type of extinguishing agent inside the extinguisher. So, what colours are used for different extinguishing agents?

Types of Fire Extinguishers and Their Colours

Water Fire Extinguisher Colour

Water fire extinguishers have an all-red body. These red fire extinguishers are suitable for Class A fires involving solid materials like wood, paper and textiles. They work by cooling the fire. Remember, water fire extinguishers should not be used on electrical fires! 

Foam Fire Extinguisher Colour 

Foam extinguishers come in the signature signal red colour but have a cream-coloured panel. A cream fire extinguisher is effective against Class A and Class B fires, which involve flammable liquids like petrol or oil. The foam creates a blanket over the fire, smothering it and preventing re-ignition. 

Dry Powder Extinguisher Colour

These dry powder extinguishers are red with a blue panel on the front. These blue fire extinguishers contain a fine powder that effectively smothers the fire. They are very versatile as they can be used on Class A, B and C fires. Some dry powder extinguishers are also suitable for electrical fires. 

CO2 Fire Extinguisher Colour 

Carbon dioxide fire extinguishers are red on the outside with a black panel. A black fire extinguisher is ideal for electrical fires and Class B fires. They work by using carbon dioxide to displace oxygen, starving the fire of its fuel. These extinguishers leave no residue, making them suitable for use around sensitive equipment. 

Wet Chemical Fire Extinguisher Colour 

With a yellow panel, wet chemical extinguishers are specially designed for Class F fires involving cooking oils and fats. Yellow fire extinguishers work by creating a soap-like substance that cools and seals the surface of the oil, preventing it from reigniting. 

Fire Classes and Their Corresponding Fire Extinguishers

Fire classes are defined by the fuel source of the fire. We have summarised the fire classes and the appropriate fire extinguisher to help you understand what to reach for in the event of a fire. 

  • Class A: Solid materials such as wood, paper and textiles are the fuel source of this form of fire. You should use a water, foam or dry powder fire extinguisher in the event of a Class A fire. 
  • Class B: Flammable liquids like petrol, oil, and some paints fuel this fire. The appropriate fire extinguisher to use in this case would be a foam, dry powder or carbon dioxide fire extinguisher. 
  • Class C: Flammable gases like propane or butane fuel these fires. The only suitable extinguisher to use in this case is a dry powder extinguisher. 
  • Class D: Metals such as magnesium or aluminium are the source of this fire. You should use special dry powder extinguishers in this case. 
  • Class F: Cooking oils and fats fuel these fires. You should opt for a wet chemical fire extinguisher in this case. 

  • It is important to note that electrical fires don’t have a specific fire class. For fires involving electrical equipment, it is best to use carbon dioxide or dry powder extinguishers. 

    Learn more about the different Fire Classes on our news page

    Understanding Fire Extinguisher Labels

    Fire extinguisher labels provide crucial information at a glance. They typically include: 

  • A Pictogram: This shows what the extinguisher can and cannot be used on. A green picture and description indicate a suitable use, while a red image and description means the fire extinguisher should not be used in that situation.
  • Fire Class Symbols: You will also see letter-coded symbols that indicate which classes of fire the extinguisher is suitable for. 
  • Instructions: A quick step-by-step on how to use the extinguisher is also provided on the label. 

  • The same label may also be placed in the form of a sign on the fire extinguisher stand or near a fire extinguisher. These labels reiterate the same information to ensure you have read and understood the type of fire extinguisher you are using. 

    Safely Extinguish Fires with Fire & Safety Centre

    Understanding fire extinguisher colours and codes is a crucial aspect of fire safety. The colour-coding system helps with the quick identification of the right extinguisher for different types of fires, especially in an emergency. It is essential that your staff understand the difference between each extinguisher and its uses to avoid accidents during a fire. 

    Ensure you are equipped for any type of fire with our range of Fire Extinguishers. We also offer Fire Hose Reels, Fire Extinguisher Stands, Cabinets and Accessories

    FAQs

    What colour is a dry powder fire extinguisher?

    Dry powder extinguishers have a blue label. A blue extinguisher is used for Class A, B and C fires and sometimes electrical fires. 

    What is a red fire extinguisher used for?

    A red fire extinguisher is a water extinguisher. They can be used to tackle Class A fires and should definitely not be used on electrical fires. 

    What is a cream fire extinguisher used for?

    A cream fire extinguisher contains foam. They are most effective against Class A and B fires that involve flammable liquids such as oils or petrol. 

    What is a black fire extinguisher used for?

    A black fire extinguisher is a carbon dioxide extinguisher. They are used to handle electrical or Class B fires. 

    What is a yellow fire extinguisher used for?

    A yellow fire extinguisher is a wet chemical extinguisher designed to handle Class F fires caused by cooking oils and fats. 

    Related Articles 

    Exploring the Power of Wet Chemical Fire Extinguishers

    Exploring the Uses and Mechanisms of Carbon Dioxide Fire Extinguishers

    Mastering Class B Fires: A Comprehensive Guide to Flammable Liquids and Fire Safety

    Demystifying Class C Fires: Your Ultimate Guide to Understanding and Managing Gas Fire Hazards