CO2: A carbon dioxide fire extinguisher works on a Class B fire by expelling CO2 to suffocate the fire, removing the oxygen necessary to keep it burning. It also helps with removing the heat, as the discharge is very cold.
Multipurpose Dry Chemical. Fire extinguishers of this type contain an ammonium phosphate base agent. Multipurpose agents are used in exactly the same manner as ordinary dry chemical agents on Class B fires. For use on Class A fires, the multipurpose agent has the additional characteristic of softening and sticking when in contact with hot surfaces.
Class B Type Fire Extinguisher
Class B fires should be extinguished using foam, powder, water mist or carbon dioxide extinguishers, according to the Fire Equipment Manufacturer’s Association. These types of extinguishers work by removing off a fire’s oxygen supply.
Class B Fire Class B fires are caused by flammable and/or combustible liquids such as chemical-based cleaning products, petrol, oils and alcohol. It is common for a class B fire to occur within a work environment …
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What is a Class B fire extinguisher?
In this blog, read on to learn just what exactly constitutes a Class B fire, what types of extinguishers qualify as Class B fire extinguishers, and to better understand what a Class B fire extinguisher can be used for. What Are Class B Fires? As alluded to above, Class B fires are ones in which flammable liquids and/or gases become involved.
What are the different types of chemical fire extinguishers?
Types of agents available include sodium bicarbonate base and potassium bicarbonate base. Dry chemical type extinguishers have special treatments that ensure proper flow capabilities by providing resistance to packing and moisture absorption (caking). Fire extinguishers of this type contain an ammonium phosphate base agent.
What is the chemical extinguishing agent made of?
The extinguishing agent can be comprised of, but is not limited to, solutions of water and potassium acetate, potassium carbonate, potassium citrate, or a combination of these chemicals (which are conductors of electricity). The liquid agent typically has a pH of 9.0 or less.
How does a Class A fire extinguisher work?
For use on Class A fires, the multipurpose agent has the additional characteristic of softening and sticking when in contact with hot surfaces. In this way, it adheres to burning materials and forms a coating that smothers and isolates the fuel from air.
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TYPES OF FIRE AND FIRE EXTINGUISHERS | WHICH FIRE EXTINGUISHER TO BE USED ON WHICH CLASSES OF FIRE Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher