Fire-fighting powders are compounds that are usually based on carbonate, phosphate, or sulfate, and the addition of anti-moisture materials such as silicones gives properties such as resistance to moisture absorption and fluidity to the powders. In general, fire extinguishing powders are divided into several categories based on fire class.
Class BC powders (base bicarbonate powders): It includes sodium bicarbonate and potassium bicarbonate powders. This group of fire extinguishing powders are used to extinguish the fire of flammable liquids and gases.