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... sprays a very fine powder of sodium bicarbonate (NaHCO3, baking soda), potassium bicarbonate (KHCO3, nearly identical to baking soda), or monoammonium phosphate ((NH4)H2PO4)....
... made of metal, such as steel, and is designed to withstand high pressures. The dry powder inside the cylinder is a mixture of various fire-fighting agents, such as monoammonium phosphate, sodium bicarbonate...