Foam vs Powder Extinguishers

Both foam and powder extinguishers are commonly found in workplaces and public spaces across the UK, but which is best? Both types of extinguisher are suitable for use on most common fire risks, making them versatile, and a popular choice. Selecting the best fire-fighting solution for your organisation can be difficult and will depend on the type of environment and risks that exist.

foam vs powder fire extinguishers
Powder extinguishers are best suited to outdoor areas

Powder Fire Extinguishers

As the name suggests, powder extinguishers contain a dust like powder, which when discharged, forms a thin layer on top of the burning fuel. This layer absorbs heat and deprives the fire of oxygen, which prevents the continuation of the chemical process of combustion.

foam vs powder fire extinguishers
Powder fire extinguishers are available in a range of sizes

Pros of Powder Extinguishers

Cons of Powder Extinguishers

  • No class F rating
  • Messy and costly to clean up after discharge
  • Should only be discharged outdoors
  • Discharge can aggravate respiratory and digestive systems
  • Can reduce visibility when discharged

Foam Fire Extinguishers

Due to the harmful PFAS chemicals that AFFF Foam contains, the manufacture of AFFF foam fire extinguishers is expected to be banned before the end of 2026. Safelincs have already discontinued the sale of AFFF Foam and water additive extinguishers, and some manufacturers have developed a range of more environmentally friendly alternatives.

Britannia Fire has launched two eco-foam P50 Service-Free Fire Extinguishers: A-Foam and B-Foam. Like AFFF Foam, the medium in these units works by covering the fire, and forming a seal that cuts off the oxygen supply, and has a cooling effect.

foam vs powder fire extinguishers

Pros of Foam Extinguishers

Cons of Foam Extinguishers

  • No class C rating

Water Mist Fire Extinguishers – an Alternative to Powder and Foam

Water mist fire extinguishers are 100% environmentally friendly, as they contain only de-ionised water. Upon discharge, water mists therefore release no harmful substances, and leave no messy residue to clean up. The water they contain is de-ionised, and so does not conduct electricity. This means that they are also safe for use on live electrical equipment, making them an ideal replacement for the AFFF foam extinguishers.

An alternative solution to foam or powder fire extinguisher

Foam vs Powder Extinguishers – Which Extinguisher Should I Choose?

In premises where the fire risk assessment has identified only Class A and/or Class B risks plus fires involving electrical equipment, there are several types of fire extinguisher which may be suitable:

Ultimately, the type of extinguisher that needs to be installed on a premises will be determined by the risks identified by the fire risk assessment. Where there is overlap, and more than one type of extinguisher would be suitable, it is up to the responsible person to ensure that they have selected the most effective and appropriate fire-fighting solution for their organisation or property.

Powder extinguishers are often best for outdoor environments where there is a mixed fire risk. Water mist or eco-foam extinguishers are ideal for indoor spaces with common fire risks.

If you are still unsure which type of extinguisher to install on your premises, why not book an extinguisher survey with one of our qualified engineers. We also offer free site surveys for service-free P50 fire extinguishers.