In the UK, fire extinguishers are classified according to the type of fire they are designed to combat. Each class is represented by a colour code and symbol to help identify the suitable extinguisher for different types of fires.
Here are the different types of fire extinguishers commonly found in the UK:
Water (Red Label): These are used for Class A fires, which involve solid combustibles such as wood, paper, and textiles. They should not be used on electrical fires or fires involving flammable liquids and gases.
Foam (Cream Label): Suitable for Class A and B fires, which include flammable liquids such as petrol and paints. Foam extinguishers form a blanket over the burning material, starving the fire of oxygen. They should not be used on electrical fires, but they are safe if inadvertently sprayed on electrical equipment.
Powder (Blue Label): These are versatile and can be used on Class A, B, and C fires, including flammable gases like propane and butane. They can also be used on electrical fires. However, powder extinguishers can create poor visibility and breathing problems, so they should be used with caution indoors.
Carbon Dioxide (CO2) (Black Label): Best for Class B fires (flammable liquids) and electrical fires. CO2 extinguishers do not leave any residue, making them suitable for offices and electronic equipment areas. They should not be used on Class A or C fires due to the risk of reignition and inability to remove heat.
Wet Chemical (Yellow Label): Specifically designed for Class F fires involving cooking oils and fats, such as deep-fat fryers. They can also be used on Class A fires but are not suitable for flammable liquid or gas fires, or electrical fires.
Water Mist (White Label): These are newer types of extinguishers that can be used on Classes A, B, C, and F fires. They work by creating a fine mist that cools the fire and reduces the oxygen level. They are safe to use on electrical fires.
Fire Blankets: While not technically extinguishers, fire blankets are used to smother fires, typically in kitchens to combat Class F fires or on a person whose clothing is on fire.
Each type of fire extinguisher is designed for specific types of fires, and it's important to use the right one to avoid spreading the fire or causing injury. In the UK, fire extinguishers should conform to British Standard BS EN 3, and they should be properly maintained and checked regularly.