The idea behind a dry chemical fire extinguisher is to blanket the fuel with an inert solid (similar to dirt or sand). A dry chemical extinguisher sprays a very fine power of sodium bicarbonate (normal baking soda), potassium bicarbonate (nearly identical to baking soda), or mono-ammonium phosphate. These solids coat the fuel and smother the fire.
Dry chemical fire extinguishers are marked with various labels. The most common are: “DC,” which stands for dry chemical. “ABC,” which indicates that they can fight Class A, B or C fires. “BC,” which indicates that they can only extinguish Class B and Class C fires. Fire extinguishers labeled “ABC” are very common, and they may be the most useful …
How Do Multi-Class Dry Chemical Fire Extinguishers Work?
The idea behind a dry chemical fire extinguisher is to blanket the fuel with an inert solid (similar to dirt or sand). A dry chemical extinguisher sprays a very fine power of sodium bicarbonate (normal baking soda), potassium bicarbonate (nearly identical to baking soda), or mono-ammonium phosphate. These solids coat the fuel and smother the fire.
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Dry Chemical – How to use a fire extinguisher training Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher