Ordinary dry powder fire extinguishing agent is mainly composed of active extinguishing components, hydrophobic components, inert filler, hydrophobic components are mainly silicone oil and hydrophobic silica, inert filler variety, mainly anti-vibration, caking, improve the performance of the dry powder movement, catalyze the dry powder polymerization of silicone oil, as well as to improve the role of the foam extinguishing agent with the **** capacity. This kind of ordinary dry powder fire extinguishing agent at home and abroad has been very common application.
Main components:
1, K2CO3
Potassium carbonate, white crystalline powder. Density 2.428g/cm3. melting point 891℃, decompose at boiling point, relative molecular weight 138.21. soluble in water, aqueous solution is alkaline, insoluble in ethanol, acetone and ether.
Hygroscopicity is strong, can absorb carbon dioxide and water when exposed to air, transformed into potassium bicarbonate, should be sealed and packed. The hydrates are monohydrate, dihydrate and trihydrate. Potassium carbonate aqueous solution is alkaline. Insoluble in ethanol and ether.
2, NaCl
Sodium chloride (Sodium chloride), chemical formula NaCl, colorless cubic crystal or fine crystalline powder, taste salty. Appearance is white crystal, its source is mainly seawater, is the main component of salt. It is easily soluble in water and glycerin, slightly soluble in ethanol (alcohol) and liquid ammonia; insoluble in concentrated hydrochloric acid. Impure sodium chloride has deliquescence in air.
Stability is relatively good, its aqueous solution is neutral, the industry generally use electrolysis of saturated sodium chloride solution to produce hydrogen, chlorine and caustic soda and other chemical products can also be used for ore smelting, medical used to configure saline, life can be used for seasoning.
Expanded Information
There are two types of dry powder fire extinguishers, portable and cart. The use of portable dry powder fire extinguishers, the first dry powder fire extinguishers to get from the fire area 3 to 4 m, pull out the safety pin, one hand holding the nozzle aimed at the root of the flame, the other hand holding the handle, the pressure handle down, then the dry powder fire extinguishers will be sprayed out a large amount of dry powder.
Aimed at the flame so that the dry powder airflow from near and far repeatedly swept across, until the fire is completely extinguished. In case of sporadic fires in many places, extinguish one place, release the pressure handle, and then run to another place, re-pressure the pressure handle to continue to extinguish the fire.
When using the cart-type dry powder fire extinguisher, open the hose, hold the gun, pull out the safety pin at the mouth of the bottle, lift the switch, and then spray the nozzle of the gun against the root of the flame.
Dry powder fire extinguishing is non-toxic and non-corrosive, and can be used to extinguish fires of burning liquids, valuable instruments, oils, combustible gases, and extinguish fires with better results. Dry powder is non-conductive, this extinguisher can be used to extinguish fires in electrically charged equipment.
Baidu Encyclopedia - Dry Powder Fire Extinguisher