What is the substance in dry powder fire extinguishers? What are the main ingredients

Dry powder fire extinguishing agent is made of fire extinguishing base material (such as baking soda, ammonium carbonate, ammonium salt of phosphoric acid, etc.) and the appropriate amount of lubricant (magnesium stearate, mica powder, talc, etc.), a small amount of moisture-proofing agent (silica gel) after mixing *** with the grinding of fine particles made of carbon dioxide as the power of jetting. Sprayed out of the powder, the concentration of dense, fine particles, covered in solid combustibles can constitute an obstacle to the combustion of the isolation layer, while precipitation of non-combustible gases, so that the concentration of oxygen in the air to reduce the flame is extinguished. 8kg extinguishers can be sprayed for 14 ~ 18 seconds, range of about 4.5m. It is suitable for extinguishing the initial fire of the oil, flammable gases, electrical equipment and other items of the 1211 extinguishers 1211 The main component of the extinguishing agent is difluorine chlorine bromide methane (CF2ClBr), which is a gas at room temperature and pressure, the boiling point is -4 ℃. Extinguishing agent in the cylinder is under pressure liquefaction state. The fire extinguishing agent sprayed from the cylinder is a mixture of fine liquid droplets and vapor. Fire extinguishing agent and combustibles in contact with heat and produce bromine ions, it and combustibles produced by the hydrogen radicals, so that the chain reaction of combustion is rapidly suspended, the fire is extinguished. 1211's suppression of the peak is small, flammable gases are mixed with 6-7% volume of 1211, combustion will stop. It is especially suitable for extinguishing fires of oil, organic solvents, high-voltage electrical equipment and precision instruments. Its extinguishing efficiency is higher than carbon dioxide more than 4 times, and does not leave traces after extinguishing.