Fire Extinguisher Colours Explained

You don’t get long to make decisions in a fire. Reach for the wrong extinguisher and you could make a dangerous situation significantly worse. That’s the whole point of fire extinguisher colours: a visual code that tells you what’s inside each cylinder and which fires it can tackle. This guide covers fire extinguisher colours and their meanings, from the dry powder fire extinguisher colour to CO2, foam and wet chemical. It’s a detailed explanation of UK fire extinguisher colour coding for every type you’ll find on UK premises, covering classes, ratings, location and what the law requires. Browse our fire extinguisher range to find the right fit for your site.

Reading time: 6 minutes

Key takeaways:

• All modern UK fire extinguishers comply with BS EN 3: a signal red body with a coloured band identifying the agent inside.
• The dry powder fire extinguisher colour is blue; dry powder extinguishers cover Class A, B, C and electrical fires.
• The colour change came in 1997 when BS EN 3 replaced fully coloured bodies with the red body plus coloured band system.
• Extinguisher selection must always be based on a fire risk assessment, not colour alone.
• Our P50 extinguishers need no engineer visits for ten years, just a recorded annual inspection by your team.

Most people don’t give fire extinguishers a second thought until a fire breaks out. Then every second matters.  

These aren’t remote possibilities; they’re documented risks that the colour coding system is designed to prevent.  

The situation and visibility of fire extinguisher coding is what makes it so effective. A colour panel stands out against a signal red body even in a smoke-filled room. When conditions are at their worst, you’re not reading instructions. You’re looking for a colour. That split-second clarity is the whole design intent.  

Your Legal Duty as the Responsible Person

Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person for any commercial premises must provide appropriate fire fighting equipment, correctly positioned and properly maintained. Understanding fire extinguisher colours and their meanings is part of meeting that duty.  

Before 1997, UK fire extinguishers were colour-coded by painting the entire cylinder body. Blue signified dry powder. Black meant CO2. Cream identified foam.  

The British and European Standard BS EN 3 replaced the old approach. All new fire extinguishers were standardised to a signal red body. Red is the colour most strongly associated with danger, and it stands out clearly in low light and smoke-filled conditions.

The identifying colour moved to a band or panel covering 5-10% of the extinguisher’s surface, positioned above the printed instructions. This shift is at the heart of an explanation of UK fire extinguisher colour coding: the body says ‘this is fire fighting equipment’, the coloured band says ‘this is what’s inside’. Together, they communicate everything you need in under a second.  

To make sense of the different colours of fire extinguishers, it helps to understand the different classes of fire first. The fire classification system groups fires by their fuel type, and each class requires a different extinguishing approach.

Here’s a summary of the different fire extinguisher colours (UK) alongside the classes each type covers:

The fire classes break down as follows. Each is defined by its fuel, which determines which agents can safely tackle it:

• Class A: Solid combustibles, including wood, paper, textiles and coal
• Class B: Flammable liquids such as petrol, paint, diesel and solvents
• Class C: Flammable gases, including propane, butane, acetylene and natural gas
• Class D: Combustible metals, requiring specialist extinguishers only
• Class F: Cooking oils and fats heated to high temperatures

The dry powder fire extinguisher colour is blue. To be precise: dry powder fire extinguishers are signal red with a blue panel above the printed instructions. This is the dry powder fire extinguisher colour code under BS EN 3, and it applies across the range, from compact 1 kg units to 9 kg cylinders.

The dry powder fire extinguisher colour label, colour band and colour panel all refer to the same identifying feature: a blue colour panel or band that tells you the cylinder contains dry powder agent. Dry powder extinguishers have a blue label because of what’s inside. Typically ABC multipurpose powder, which works by interrupting the chemical chain reaction that sustains a fire and creating a barrier between fuel and oxygen.

That mechanism is what makes blue-labelled dry powder extinguishers effective on Class A, B, C and electrical fires, giving them the broadest standard fire class coverage available.

Dry Powder Fire Extinguisher Guide: Colours and Uses

This dry powder fire extinguisher guide, colours and uses section covers the key details on where these extinguishers perform well.

Dry powder extinguishers are commonly found in:

• Vehicles and mobile plant, including vans, HGVs, forklifts and site machinery
• Garages, workshops, petrol forecourts and paint stores with flammable liquid storage
• Agricultural and construction settings with mixed fuel and solid material risks
• Open outdoor industrial environments where flammable gases are the primary hazard

That broad fire class coverage is why they remain a default choice in vehicle and industrial settings. But there are real trade-offs worth knowing before you buy.

On discharge, dry powder creates a dense cloud. In an enclosed space, visibility drops fast and inhalation becomes a risk. The residue left behind is also difficult to clean up and can damage electronic equipment and precision machinery.  

For most occupied indoor premises, water mist or foam extinguishers are a safer fit. Our water mist range covers a broad range of fire types without the visibility or contamination issues that come with powder. If your risk assessment covers an office, school or care environment, powder is rarely the right answer.  

Not sure which colours of fire extinguishers your premises needs, or how many units are required? A fire risk assessment is the right place to start. We offer BAFE-certified extinguisher surveys across the UK.