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NaOH+AlCl3+3NaHCO3====Al(OH)3↓＋3CO2↑+3NaCl Dry powder fire extinguisher is filled with dry powder fire extinguishing agent. Dry powder fire extinguishing agent is a dry and easy-flowing fine powder used for fire extinguishing. It is composed of inorganic salts with fire extinguishing effect and a small amount of additives that are dried, crushed, and mixed to form a fine solid powder. It is a fire extinguishing agent widely used in firefighting and is mainly used in fire extinguishers. In addition to special dry powder chemical fire extinguishing agents for extinguishing metal fires, dry powder fire extinguishing agents are generally divided into two categories: BC dry powder fire extinguishing agents and ABC dry powder. Such as sodium bicarbonate dry powder, modified sodium salt dry powder, potassium salt dry powder, ammonium dihydrogen phosphate dry powder, diammonium hydrogen phosphate dry powder, phosphoric acid dry powder and amino dry powder fire extinguishing agent. Dry powder fire extinguishing agents mainly extinguish fires through the physical and chemical effects that occur when the powder mist sprayed under the action of pressurized gas contacts and mixes with the flame.: First, the volatile decomposition products of the inorganic salts in the dry powder react chemically with the free radicals or active groups generated by the fuel during the combustion process, causing chemical inhibition and side catalysis, interrupting the combustion chain reaction and extinguishing the fire. ； Second, the dry powder powder falls outside the surface of the combustible material, undergoes a chemical reaction, and forms a glass-like covering layer under the action of high temperature, thereby isolating oxygen and suffocating the fire. In addition, there is partial dilution of oxygen and cooling effects. How to use: 1. Before use, shake the fire extinguisher several times to loosen the dry powder in the bottle. ； 2. Unplug the safety pin, select the upwind position, aim at the root of the flame, press down the handle and spray ； 3. During the fire extinguishing process, you should always remain upright and do not use it lying down or upside down. ； 4. Prevent re-ignition after extinguishing the fire. This post was last edited by jannes on 2009-2-22 13:47 ]