Wet Chemical fire extinguishers contain a liquid extinguishing agent which is used to smother fires ignited from cooking oils and fats.

Knowing how and when to use your fire extinguisher is essential to ensuring safety in your office/household.

Wet Chemical Fire Extinguisher – What Colour Band?

Wet chemical fire extinguishers come in an all red cylinder with an oatmeal coloured band running around the top.

When To Use A Wet Chemical Fire Extinguisher?

Wet chemical fire extinguishers are recommended to extinguish class A and class F fires.

Wet chemical fire extinguishers are highly recommended as a safety precaution within commercial kitchens where it is more common for a fire to ignite, involving cooking oils and fats.

They are the only type of fire extinguisher recommended to fight this type of fire.

Commercial kitchens are also recommended to have a foam extinguisher and a CO2 extinguisher on site as a precaution for all fire risks that could occur.

To learn more about the different types of fires and fire extinguishers, please refer to this detailed chart.

Wet Chemical Fire Extinguisher

How Does A Wet Chemical Fire Extinguisher Work?

All fire extinguishers work by removing one or more of the 3 key elements that are required for a fire to flourish.

Wet chemical fire extinguishers are filled with potassium, which cools and lowers the temperature of the fire, therefore stopping the fire from spreading.

When the fire extinguisher is used, the potassium sprays out in a fine mist which then reacts with the fats and oils in the fire (class F fire). This creates a soapy layer on the surface which smothers, cools and extinguishes the fire.

It is advised that Wet chemical fire extinguishers, foam extinguishers and water extinguishers should never be used on fires that involve electrical appliances and equipment (class E fire.)

Class F Fire

Advantages of Wet Chemical Fire Extinguishers

  • Wet chemical fire extinguishers provide fast reduction in the event of a class F fire. By leaving a foam like barrier, it reduces the chances of the fire reigniting.
  • The low pressure of the extinguisher eliminates the risk of the hot fats and oils being splashed around. This prevents injury from burns and reduces the chance of the fire spreading.
  • Clean up after use is quick and easy.
Wet Chemical Fire Extinguisher Sign

Disadvantages of Wet Chemical Fire Extinguishers

  • The solution inside a wet chemical fire extinguisher is alkaline, this means that it could corrode some metals, especially aluminium.
  • Eyes and skin could become irritated when used so prompt clean up his highly recommended.

How To Use Wet Chemical Fire Extinguishers?

The working process of a wet chemical fire extinguisher involves 4 simple steps called the PASS technique.

This is a universal process for all fire extinguishers on the market.

The PASS technique is as follows…

  • Pull the pin.
  • Aim it at the fire.
  • Squeeze the handle.
  • Sweep from side to side.

See our detailed guide: How to Use a Fire Extinguisher.

PASS Technique Fire Extinguisher

Additional Tips

  • Whether it’s your home, office, or business, everyone who lives or works there should know where the fire extinguishers are located. They should also be aware of its capabilities, limitations, and should know how to use it.
  • Wet chemical fire extinguishers are most commonly used for class F fires, although they can also be used for class A fires, replacing a plain air/water fire extinguisher. Class A fires involve materials such as paper, cardboard and wood.

Our range of Wet Chemical Fire Extinguishers available include: 2 Litre, 7 Litre

For our detailed articles on other types of fire extinguishers click one of the below links:

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