Foam fire extinguishers are traditionally used for tackling fires involving flammable liquids (Class B) as well as solid combustible materials (Class A). They work by forming a blanket over the fire surface, helping to cool flames and suppress vapours.
Why it works: foam spreads across burning liquids, sealing the surface
and reducing the release of flammable vapours while also providing a cooling effect.
✅ Key benefits
- Effective on flammable liquid fires (Class B)
- Cooling action helps reduce re-ignition risk
- Multi-risk coverage for Class A and B fires
- Commonly specified for fuel and liquid storage areas
🏭 Best for
Workshops, garages, fuel handling areas, storage rooms for flammable liquids, and industrial environments where liquid fire risks are present.
⚠️ Important considerations
Many traditional foam extinguishers contain PFAS “forever chemicals”, which are being phased out across the UK and Europe due to environmental and health concerns. Even newer fluorine-free foams still require specialist disposal and are not considered truly “green” when end-of-life is taken into account.
🌍 Environmental impact
If sustainability, compliance, or future-proofing is a priority, it’s important to understand how foam extinguishers are changing and what alternatives now exist.
🧠 Helpful guides
Learn more about safer and more sustainable fire protection: Environmental impact of fire extinguishers • Extinguisher placement