What is a class A B fire extinguisher used for?

Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.

Can you use a Class B fire extinguisher on any fire?

Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. Two commonly used chemicals are effective in fighting these types of fires.

Can BC extinguisher be used on a?

Most BC extinguishers are made from bicarbonate salts, which can smother a flame, but not the embers. “In addition to effectiveness on class B and C fires, it will have some effect on the flaming stages of a class A fire but no effect on the ember or deep seated stages of a class A fire.”

Are Class A and B fire extinguishers rated by number?

Fire Extinguisher Size Ratings The Class A size rating represents the water equivalency. Each number represents 1 ¼ gallons of water. For instance, 2A means the extinguisher is just as effective as 2 ½ gallons of water. The Class B size rating indicates the square footage the extinguisher can cover.

Which type of extinguisher is intended to be used on a Class B fire?

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.

What are Class B and C fires?

Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. Class C fires which involve energized electrical equipment.

Which fire is Class B fire?

Class B are flammable liquids fires such as fuel, gasoline, kerosene, white-spirit… Class B are flammable gases fires such as ethanol, propane, butane, acetylene, hydrogen, methane…

When using foam a Class B fire is extinguished by?

Foam extinguishes Class B Fires by covering the flammable liquid with a foam blanket, thus cutting off the oxygen supply from the combustion process. The water content of the foam will help lower the temperature of the flammable liquid.

Can you use a Class B and C fire extinguisher on a Class A fire?

They contain an extinguishing agent and use a compressed, non-flammable gas as a propellant. Water These extinguishers contain water and compressed gas and should only be used on Class A (ordinary combustibles) fires. Carbon Dioxide (CO2) extinguishers are most effective on Class B and C (liquids and electrical) fires.

What does a Class B fire extinguisher contain?

Because of this, Class A fire extinguishers use water, while Class B fire extinguishers use dry chemicals (foam or powder), such as aqueous film-forming foam, multi-purpose dry chemicals such as ammonium phosphate, and halogenated agents (such as Halon 1301 and Halon 1211) or highly pressurized carbon dioxide.

What does a rating of 40 on a Class B extinguisher mean?

What does a rating of 40 on a class B extinguisher mean? Sufficient extinguishing power for 40 square feet of burning fuel.

Which of the following types of surfaces should a Class B fire extinguisher not be used?

Fire buckets can be used filled with water on Class A fires, or with sand to use as an absorbing agent on spilled flammable liquids (Class B). They must not be used with water on burning fat or oil or on electrical appliances.