BC dry powder extinguishing agent(sodium bicarbonate powder, BC dry chemical powder), knows also as silicified dry powder extinguishing agent , is made up of sodium bicarbonate, silicone oil, mobility accelerator, anti-caking agent, additive etc. It is characterized by speedy fire extinguishments, high fire-fighting efficiency, excellent insulation, long storage life, no harm to people and animals, and combination use of fluoro-protein foam extinguishing agent or aqueous film-forming foam extinguishing agent( light water) in fighting fire of petroleum product in large area. It can be charged in portable extinguisher, wheeled fire extinguisher and dry powder fire truck to kill fire of flammable liquid, gas and charged equipment and is widely used in field such as oilfield, tank farm, vessel, warehouse, oil refinery, substation, petrochemical enterprises, etc..