Dry Chemical fire extinguishers extinguish the fire primarily by interrupting the chemical reaction of the fire triangle.Today's
most widely used type of fire extinguisher is the multipurpose dry chemical that is effective on Class A, B, and C fires. This
agent also works by creating a barrier between the oxygen element and the fuel element on Class A fires.Ordinary dry chemical is for Class B & C fires only. It is important to use the correct extinguisher for the type of fuel! Using the incorrect agent can allow the fire to re-ignite after apparently being extinguished succesfully.