1 Before use, turn the bottle upside down several times, shake it upside down to loosen the dry powder, and then pull out the lead seal.

2. Pull out the safety pin.

3. Keep a safe distance (about 2-3 meters away from the fire source), press the handle with your right hand, swing the nozzle from side to side with your left hand, aim the nozzle at the root of the flame, press the handle with your right hand hard, and spray dry powder to cover the burning area until the fire is completely extinguished.

Extended data

Fire extinguishing principle of dry powder fire extinguisher:

The dry powder fire extinguisher is filled with ammonium phosphate dry powder fire extinguishing agent. Dry powder fire extinguishing agent is a dry and easy-flowing fine powder used for fire extinguishing, which is composed of inorganic salt with fire extinguishing effect and a small amount.

The additives are dried, crushed and mixed into fine solid powder. It is a kind of fire extinguishing agent widely used in fire fighting, and it is mainly used in fire extinguishers. In addition to the special dry powder chemical fire extinguishing agents for metal fires, dry powder fire extinguishing agents are generally divided into BC dry powder fire extinguishing agents (sodium bicarbonate, etc.) and ABC dry powder (ammonium phosphate, etc.).

First, the volatile decomposition products of inorganic salts in dry powder react with free radicals or active groups generated by fuel during combustion to chemically inhibit and negatively catalyze the combustion, so that the chain reaction of combustion is interrupted and the fire is extinguished;

Second, the powder of dry powder falls outside the surface of combustible materials, causing chemical reaction and forming a glassy covering layer under the action of high temperature, thus isolating oxygen and suffocating and extinguishing fire. In addition, there are some oxygen dilution and cooling effects.

References:

Baidu encyclopedia-dry powder fire extinguisher