In daily life, fires often occur due to people's improper living habits or weather. We usually have to understand fire extinguishing agents to be able to help at critical times. So what are the commonly used fire extinguishing agents?
water
Water is the most widely used extinguishing agent, and most fires can be extinguished with water. It is also the most widely used extinguishing agent for civil fire extinguishing. The biggest feature of water as a fire extinguishing agent is that it is cheap and widely used, so it is quite common. In specific fire extinguishing work, water is used as a fire extinguishing agent, which can absorb a large amount of material combustion heat, thereby reducing the temperature of the burning material, and finally stopping the combustion. The use of mist-like water flow can also dilute the concentration of the air in the fire site, and can effectively extinguish dust fires. However, special attention should be paid to the fact that water fire extinguishing agents cannot extinguish burning materials that will ignite and explode when wet, such as alkali metals, alkaline earth metals, etc.; nor can they extinguish charged materials, insoluble materials (such as petroleum), strong acid materials, and valuable, Fires of precision instruments and books.
Carbon dioxide fire extinguishing agent
Carbon dioxide fire extinguishing agents are often stored in liquid form in special containers (called carbon dioxide fire extinguishers). Because carbon dioxide can absorb a large amount of combustion heat when it is stored and released in a liquid form, the purpose of ending the combustion of materials is achieved. On the other hand, carbon dioxide is a very stable inert gas, which can fully dilute the oxygen content in the air and suffocate the combustion. It does not leave any residue after volatilization, and it is not conductive, so it is particularly suitable for fighting electrical fires and precision instrument fires under high pressure, and not suitable for alkali metal, alkaline earth metal, and hydride fires. It is important to note that when using a carbon dioxide fire extinguisher, you must not touch the metal part of the fire extinguisher nozzle with any part of your body to prevent frostbite. When the carbon dioxide released on the fire scene exceeds a certain concentration, it will make it difficult to breathe and even suffocate. So special mention should be made.
Dry powder fire extinguishing agent
This fire extinguishing agent uses ultra-fine chemical powder to act on the burning material, which can break the chain reaction of combustion and terminate the combustion. It also has many types, such as ammonium carbonate dry powder fire extinguishing agent, ammonium phosphate salt fire extinguishing agent and so on. This fire extinguishing agent has a wide range of applications. But it is not suitable for fighting fires of wood, light metals, alkaline earth metals and various precision instruments and equipment.