The active material may be a powder such as potassium bicarbonate (KHCO3), liquid water, an evaporating fluorocarbon or the propelling agent itself. The most effective and common fluorocarbon used until recently for this application had been bromochlorodifluoromethane (CF2ClBr), referred to as halon 1211.
Which liquid is generally used as fire extinguisher?
Class A fire extinguishers are usually water-based. Water provides a heat-absorbing (cooling) effect on the burning material to extinguish the fire. Pressurized water extinguishers use air under pressure to expel the water which is directed with a short hose.
What are the 4 types of fire extinguishers?
There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire. Multipurpose extinguishers can be used on different types of fires and will be labeled with more than one class, like A-B, B-C or A-B-C.
Which chemical is used as fire extinguishers How is it harmful?
The dry chemical is potassium bicarbonate or sodium bicarbonate. They are harmful if inhaled.
Why CO2 is used as fire extinguisher?
Why is carbon dioxide used in fire extinguishers? We use carbon dioxide in fire extinguishers because it displaces or reduces the amount of oxygen in the atmosphere around the fire. … By removing the oxygen from the formula and smothering it with discharged CO₂ gas, the fire will be extinguished.