Wet Chemical Fire Extinguishers

A wet chemical fire extinguisher is a specialist unit designed to tackle Class F fires involving hot oils, fats, and deep-fat frying equipment – hazards that cannot be safely extinguished with other extinguisher types. Wet chemical units use a potassium-based solution that is discharged as a fine mist, helping to cool the fire and avoid splashing.

The suppression process works in two stages:

1. Cooling and smothering – The agent rapidly cools the burning oil, reducing heat and preventing re-ignition. The mist also gently blankets the surface, cutting off oxygen and suppressing the flames.
2. Saponification reaction – When the chemical comes into contact with burning oils or fats, it reacts to form a thick, soap-like layer. This seals the surface of the oil, providing long-lasting protection against the fire reigniting.

Because of this powerful dual action, wet chemical fire extinguishers are the safest and most effective solution for:

• Commercial kitchens
• Restaurants and food service venues
• Takeaways and catering units
• School, hotel, and hospital kitchens
• Food processing areas
• Any environment with deep-fat fryers or high-temperature cooking appliances

For any environment where cooking oils pose a risk, a wet chemical extinguisher is essential for both safety and compliance.