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Wet Chemical Fire Extinguishers

Wet chemical fire extinguishers are designed for one purpose: to extinguish Class F fires, those caused by the ignition of flammable cooking oils and fats. These liquids have a particularly high flash point that makes other types of extinguisher unsuitable for the job, but wet chemical extinguishers have been invented for the sole purpose of extinguishing this type of fire safely. These extinguishers cannot be used on Class B fires – those involving other flammable liquids like petrol or diesel.

Most commonly used in industrial kitchen settings, our wet chemical fire extinguishers come in a range of sizes from 2 to 6 litres. All of our wet chemical extinguishers come with a 5-year manufacturer warranty, and 100-day free returns guarantee. To ensure your kitchen is safety compliant and ticks every box in a risk assessment, explore our range of wet chemical extinguishers today.

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What is a wet chemical fire extinguisher used for?

Wet chemical fire extinguishers are used for flammable cooking oils and fats, for example chip pan fires and other deep fat frying conditions. These are known as Class F fires, which can be unintentionally spread if attempts are made to extinguish them with other types of fire extinguisher.

A long lance applicator enables the user to stand well back and to gently apply the wet chemical onto the fire without danger. However, as the method of use is different to other fire extinguishers, we recommend that commercial kitchen staff be given quality fire training.

What colour is a wet chemical fire extinguisher?

Wet chemical fire extinguishers are typically red with a yellow label, however we also stock polished stainless steel versions which offer a stylish chrome effect. These are available in 2 litre sizes, along with the standard red versions.


A 6 litre size is still easy for anyone to pick up, but can tackle as much as 75 litres of flaming oil or fat! 

What is the wet chemical in a fire extinguisher made of?

Potassium is the key chemical element that is used in a wet chemical extinguisher. The active ingredient is potassium acetate, but other additions often include potassium citrate or potassium bicarbonate.

How does a wet chemical fire extinguisher put out a fire?

The technical name for the process is ‘saponification’, but in simple terms, the difference between these and other extinguishers is that they are not simply smothering the flames. The process of extinguishing a Class F fire is two-step: first, the chemicals from the extinguisher cool the flammable liquid to reduce flames and prevent splashing. Then, the chemical reaction that takes place on contact turns the oil or fat into a thick, soapy, non-combustible substance. 

Saponification is the name of the process used to turn oils and fats into soaps: the only difference here is that the oils and fats being converted start out on fire, and end up flame-free. 

Our accreditation and guarantees

All of Fire Protection Online's wet chemical extinguishers have been manufactured to the highest quality possible and have genuine full BAFE (British Approvals for Fire Equipment) certification, BSi Kitemark to BS EN3 and CE Mark (a legal requirement with the Pressure Equipment Directive - PED).

All of our wet chemical fire extinguishers come with:

  • Low Price Guarantee
  • 100-Day Free Returns Guarantee
  • 100% Satisfaction Guarantee
  • 6 Year Manufacturer Warranty
  • Next Day Delivery

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