How To Choose A Fire Extinguisher

If divided according to the combustion characteristics, we can divide the fire into five types, which are Class A fire, Class B fire, Class C fire, Class D fire, and Class E fire. These five different types of fire extinguishers are also suitable. Let's introduce these five different types of fires one by one!

First, let's look at Class A fires, which refer to fires with fixed substances. Fixed substances tend to have organic properties and generally produce scorching embers when burned. Fires like wood, cotton, hemp, paper burning, etc. In the face of such a fire, we can use clean water fire extinguishers, acid and alkali fire extinguishers, chemical foam fire extinguishers, phosphorus salt dry powder fire extinguishers, haloalkane 1211 fire extinguishers and 1301 fire extinguishers. It should be noted that this type of fire cannot be extinguished with sodium salt dry powder fire extinguishers and carbon dioxide fire extinguishers.

Class B fire: refers to liquid fire and meltable solid substance fire. Such as gasoline, kerosene, diesel, crude oil, methanol, ethanol, asphalt, paraffin and other fires. Dry chemical extinguishers, halogenated alkane 1211 extinguishers, 1301 fire extinguishers and carbon dioxide fire extinguishers can be used for this fire. Here, foam fire extinguishers are only suitable for oil fires, not solvent fires, so use them with caution.

Class C fire: refers to combustible gas fire. Such as kerosene, natural gas, methane, ethane, propane, hydrogen and other combustible fires. This can be done with dry powder fire extinguishers, halogenated alkane 1211 fire extinguishers, 1301 fire extinguishers, and carbon dioxide fire extinguishers. Water-based fire extinguishers and foam fire extinguishers cannot be used for this type of fire.

Class D fire: refers to metal fire. Fires like potassium, sodium, magnesium, aluminum-magnesium alloy, etc. In the face of this type of fire, there are not many fire extinguishers that can be used at present, and D-type dry powder fire extinguishers can be used.

Class E fire: refers to a fire in which a charged object burns. Halogenated alkane 1211 fire extinguisher, 1301 fire extinguisher and dry powder fire extinguisher, carbon dioxide fire extinguisher can be used.

Well, knowing these classifications, let's briefly introduce the use of several fire extinguishers.

(1) Foam fire extinguisher
When using, first check whether the nozzle is blocked by foreign objects, if there is any, poke it with wire, and then cover the nozzle with your fingers to turn the cylinder upside down several times, and the nozzle will spray foam against the fire point. Be careful not to point the bottom of the cylinder and the lid against the human body to prevent injury in case of explosion.

(2) Dry powder fire extinguisher
When using, first remove the lead seal, pull out the full pin, carry the fire extinguisher spray body, firmly grasp the pressure handle to open the valve, and the dry powder stored in the sodium bottle will be violently sprayed from the nozzle.

(3) 1211 fire extinguisher
First, remove the lead seal, unplug the full pin, aim the nozzle at the ignition point, firmly grasp the pressure handle to open the valve, and make the fire extinguisher agent stored in the cylinder spray violently from the nozzle.

(4) Carbon dioxide fire extinguisher
When using, hold the horn barrel with one hand and aim at the ignition source, and turn on the switch with the other hand. Note: It is necessary to prevent freeze insulation to prevent the nozzle from blocking.