The foam fire extinguisher is one of the most widely used and trusted tools when it comes to workplace safety. As part of the broader fire extinguisher family, foam models are known for their reliability, especially in environments where both solid and flammable liquid fires may occur. Offices, schools, warehouses and many public buildings across the UK rely on these cream coloured extinguishers to help manage a range of fire risks. Whether it’s paper, textiles or even a burning liquid, foam offers an effective, practical solution that fits seamlessly into most fire safety strategies. Read on and check out our guide to learn more.

What is a Foam Fire Extinguisher?

A foam fire extinguisher is designed to tackle two of the most common types of fires: Class A (involving solids like paper, wood and fabrics) and Class B (flammable liquids such as petrol, paint and solvents). It contains aqueous film forming foams, which work by creating a barrier between the fire and the fuel, helping to put it out quickly and prevent it from starting up again.

Visually, it’s easy to spot. Foam extinguishers have a cream coloured label and are often clearly marked for use on Class A and B fires. They’re one of the most practical choices for general fire safety, especially in areas where both solid materials and burning liquids could be a concern. While not suitable for electrical appliances or cooking oil fires, their broad use makes them a key part of many UK fire risk assessments.

We can supply extinguishers to suit the needs of many different industries, including

• Vehicles
• Commercial
• Residential
• Healthcare
• Marine

How Does a Foam Fire Extinguisher Work?

Foam extinguishers tackle fires in two ways. When discharged, they release a thick, foamy spray that coats the fire and forms a barrier over the flames. This barrier blocks oxygen from reaching the fire, which helps to smother it. At the same time, the foam cools the fire, reducing the heat and helping to stop the flames from returning.

On liquid fires, like petrol or paint, the foam gently spreads across the surface. This helps prevent the fire from splashing or spreading, which can happen if water is used. The foam seals in flammable vapours and lowers the temperature, making it harder for the fire to reignite.

Compared to something like a dry powder extinguisher, foam tends to be cleaner and easier to control. It sticks to the surface, giving more lasting coverage. That’s especially useful in places where flammable liquids are stored or used regularly.

Foam extinguishers are fairly simple to operate. You don’t need specialist knowledge to use one, just aim, squeeze and sweep. As long as it’s safe to do so, they offer a fast and reliable way to deal with fires involving burning materials or flammable liquids.

What Fires Are Foam Fire Extinguishers Used For?

Foam extinguishers are suitable for use in tackling Class A and Class B fires.

Class A fires involve everyday solid materials. This includes things like paper, wood, and textiles, materials commonly found in offices, schools, and public buildings.

Class B fires are those involving flammable liquids, such as petrol, paint, or cleaning solvents. These are more likely in workshops, garages, or storage areas where liquid fuels or chemicals are handled.

It’s important to note that foam fire extinguishers are not safe for use on electrical fires or those involving cooking oils, such as chip pan fires. Using the wrong extinguisher can make a fire worse or put the user at risk, especially around electrical appliances or hot oils.

In most UK workplaces where mixed materials are present, foam extinguishers offer a practical and versatile first response to common fire risks.

Pros and Cons of Foam Fire Extinguishers

Pros:

• Effective on multiple fire types (especially liquid fires): Foam works well on both solid combustibles like paper and wood, and flammable liquids such as petrol and paint, making it ideal for mixed-risk environments.
• Prevents re-ignition: The foam creates a seal over the surface of the fire, cutting off oxygen and helping to stop the flames from flaring back up.
• Safe to use compared to CO₂ in confined spaces: Unlike carbon dioxide extinguishers, foam doesn’t displace breathable air, so it’s safer in enclosed rooms where ventilation may be limited.

Cons:

• Not safe for electrical fires: Foam conducts electricity, so using it on live electrical appliances can be dangerous.
• Can leave residue: Once discharged, the foam can leave a layer behind that needs to be cleaned up.
• Less effective on cooking oil fires: Foam isn’t suitable for kitchen fires involving hot oils or grease, which require a wet chemical extinguisher instead

Who Needs a Foam Fire Extinguisher?

• Offices using flammable liquids like paints or cleaning supplies
• Garages with fuels, oils or general liquid fire risks
• Workshops handling solvents, adhesives or other flammable chemicals
• Petrol stations or fuel storage units with liquid hazards
• Schools and colleges with mixed fire risk environments
• Warehouses storing packaging, cardboard or combustible goods
• Retail stores with backrooms containing flammable stock
• Public buildings with general fire safety requirements
• Commercial properties needing fire risk compliance
• Sites requiring insurance-approved fire extinguisher coverage

Foam fire extinguishers offer reliable protection for spaces where both solid and liquid fire hazards exist. Their versatility makes them a smart addition to many fire safety plans.

How to Use a Foam Fire Extinguisher?

Using a foam fire extinguisher is straightforward, but always make sure it’s safe before you step in. Evacuate the area and phone 999 if the fire is large and spreading rapidly.

Step-by-step:

• Pull the pin to break the seal and unlock the handle.
• Aim low towards the base of the flames, not the top.
• Squeeze the handle until the foam begins to release.
• Use a side-to-side motion until the fire goes out.

Tip: When tackling liquid fires, aim to spread the foam gently across the surface without disturbing it. This helps create an even layer that seals in the vapours and prevents reignition.

Safety note: Only use a foam extinguisher if you’ve been trained to do so and feel confident.

Foam fire extinguishers are a reliable choice for tackling a mix of fire risks, especially those involving flammable liquids and everyday materials. Their ability to cool the fire and prevent it from reigniting makes them a smart addition to most fire safety setups.

Whether you manage an office, garage, school or shop, a foam extinguisher can offer peace of mind and practical protection.

At B9 Fire & Security, we are specialists in supplying, installing, and maintaining all types of fire extinguishers. To find out more about our full range of fire extinguishers or to arrange a consultation, get in touch with our highly knowledgeable team via our contact page.