When it comes to fire safety, choosing the right fire extinguisher is crucial. Foam fire extinguishers offer a versatile solution, suitable for tackling a wide range of fires.

Foam fire extinguishers are essential for tackling a range of fires. They’re especially effective on Class A and Class B fires, such as wood, paper, and flammable liquids. Foam works by forming a barrier that smothers the flames and cools the fire.

In this blog, we’ll explore how foam fire extinguishers work, when to use them, and their key advantages in different environments.

What Is An AFFF Foam Fire Extinguisher?

In most workplaces and buildings, a foam fire extinguisher is likely to be your first option in case of a fire. Foam extinguishers are particularly effective on flammable solids and liquids, making them a popular choice for a wide range of premises. Their versatility and reliability make them a go-to solution for general fire safety.

How Does An AFFF Foam Fire Extinguisher Work?

An AFFF foam fire extinguisher works by creating a foam blanket that smothers the fire.

The foam cuts off oxygen, stopping the fire from spreading. It also cools the flames, reducing the heat. This makes it effective on Class A (solid) and Class B (liquid) fires. The foam forms a barrier that prevents re-ignition. Ideal for flammable liquids, it’s commonly used in industrial settings and petrol stations.

Are There Non-PFAS Foam Extinguishers?

Yes, there are non-PFAS foam extinguishers. These use fluorine-free foam that doesn’t contain harmful chemicals like PFAS. They’re environmentally friendly and safer for human health. Non-PFAS foam is just as effective on Class A and B fires but without the environmental impact. These fire extinguishers are becoming more popular due to growing concerns about PFAS chemicals.

Is PFAS Banned In 2025?

No, PFOA and PFOS will be banned in July 2025, not all PFAS. Many foam extinguishers still contain other PFAS chemicals, but safer fluorine-free alternatives are now available. These non-PFAS foams are better for the environment while still being effective on Class A and B fires. For more information, visit OHEAP's blog.

Ideally, businesses should start switching to PFAS-free options before a future ban takes effect.

When To Use A Foam Fire Extinguisher

Use a foam fire extinguisher on Class A (solid) and Class B (liquid) fires. It’s ideal for wood, paper, textiles, and flammable liquids like oil or petrol. Foam is also effective on small electrical fires if turned off first. Avoid using it on metal fires or cooking oil fires.

Foam can be used on some fires involving electrical appliances, but only if the extinguisher has passed a 35kv conductivity test. However, we would always recommend a CO2 fire extinguisher for electrical fires.

When NOT To Use A Foam Fire Extinguisher

Don’t use a foam fire extinguisher on electrical fires unless the power is turned off. Avoid using it on metal fires, such as magnesium or sodium. It’s also not suitable for cooking oil fires or deep fat fryer fires. Foam can spread the fire in these situations.

How To Identify A Foam Fire Extinguisher

A foam fire extinguisher with a cream label is easy to spot. The label will feature FOAM written in text. It also has a red body with a cream-coloured band. The label will list Class A and Class B fire types it can handle. Look for clear instructions and a pressure gauge. All in accordance with BS EN 3.

The Pros And Cons Of A Foam Fire Extinguisher

Pros Of A Foam Fire Extinguisher:

• Effective on Class A and Class B fires.

• Works on flammable liquids like petrol.

• Versatile for homes and businesses.

• Forms a barrier to prevent re-ignition.

Cons Of A Foam Fire Extinguisher:

• Not suitable for electrical fires unless power is off.

• Can contain PFAS forever chemicals.

• Can damage sensitive equipment.

• Not effective on metal or cooking oil fires.

• Can leave a mess after use.