Multipurpose fire extinguishers primarily use what type of material?

Multipurpose fire extinguishers are primarily designed to combat different classes of fires and are most commonly filled with dry chemical materials. These dry chemicals, such as monoammonium phosphate, effectively interrupt the chemical reaction of fires, making them suitable for Class A (ordinary combustibles), Class B (flammable liquids), and Class C (electrical) fires.

The versatility of dry chemical materials allows these extinguishers to be used in various environments, from homes to industrial settings, providing a broad range of fire suppression. This adaptability is a significant reason why they are often required in multiple settings, ensuring safety in diverse scenarios.

While wet chemical extinguishers are specifically designed for kitchen fires (Class K), foam is generally used for flammable liquid fires (Class B), and gas-based extinguishers are typically for use in electrical fires or specialized environments, they do not offer the same multifunctional approach that dry chemical extinguishers provide. Thus, the emphasis on dry chemical materials highlights their critical role in fire safety and response.