Question

How many types of firefighting foam are typically used in portable extinguishers?

a) One type
b) Two types
c) Three types
d) Four types

Answer 1

Portable fire extinguishers typically use two types of firefighting foam: Aqueous Film Forming Foam (AFFF) for hydrocarbon fuel fires and Alcohol-Resistant Aqueous Film Forming Foam (AR-AFFF) for alcohol-based liquid fires.

Step-by-step explanation:

Typically, portable fire extinguishers use two types of firefighting foam. These are Aqueous Film Forming Foam (AFFF) and Alcohol-Resistant Aqueous Film Forming Foam (AR-AFFF). AFFF is used for hydrocarbon fuel fires such as gasoline and oil, while AR-AFFF is used for fires involving alcohol-based liquids. Both types of foam create a barrier between the fuel and the air to suppress the fire. It's important to use the correct type of foam for the specific fire class, as using the wrong one can be ineffective and may even exacerbate the situation.