Dry powder fire extinguisher to extinguish fire commonly, also can be put out of oil, gas and burning fire.
dry powder fire extinguisher is carbon dioxide or nitrogen gas is used as the power, the powder jet fire within the cylinder. Powder is a kind of dry, easy flow of fine solid powder, made up of fire extinguishing makings and moistureproof agent, flow improver, agglomeration preventing agent additive composition and so on.

How dry powder fire extinguishers work:
Dry powder fire extinguishers smother fires by forming a barrier between the fuel and the source of oxygen.
As they do not cool the fire, there is a small risk of re-ignition.
NaOH+AlCl3+2NaHCO3====Al(OH)3↓+2CO2↑+3NaCl

Pros and Cons of dry powder fire extinguishers:
Pros: work on most types of fire; they suppress fires very quickly; specialist dry powder extinguishers are the only extinguishers that work on flammable metals.
Cons: slight danger of the fire re-igniting; when discharged, the powder can spread over a large area leaving a residue; can obscure vision when discharged and can be inhaled if used in enclosed areas.

Who needs dry powder fire extinguishers?:
Dry powder fire extinguishers are ideal for open or outdoor environments with the risk of several different types of fire, especially those involving chemicals, fuel, or vehicles. 

Examples include:
• Garage forecourts
• Large, commercial boiler rooms
• Flammable liquid storage facilities
• Large workshops
• Fuel tankers and other vehicles

1.How about the Delivery time?