We can't use a carbon dioxide fire extinguisher, because foam extinguisher put out the fire by mixing an acidic solution and an alkaline solution in a steel cylinder to have a chemical reaction, and the foam produced was pushed out of the nozzle. It can be used to put out fires of common solid substances, but it can also put out fires of flammable liquids such as oil, but it cannot put out fires of charged equipment and organic solvents such as alcohol, ketone, ester and ether. There are three types of foam extinguisher: MP portable, MPZ portable and MPT cart.