Class B fires involve which materials?

Class B fires involve which materials?

• A. Flammable liquids
• B. Ordinary combustibles
• C. Electrical equipment
• D. Metals

Answer: (A)

Class B fires involve flammable liquids, which are liquids with low flash points that emit ignitable vapors. Examples include gasoline, solvents, mineral spirits, paints thinner, and certain oils. These fires are defined by the fuel being a liquid that can produce vapors capable of ignition, unlike other classes that involve different forms of fuel: ordinary combustibles like wood and paper for Class A, energized electrical equipment for Class C, and reactive metals for Class D. Knowing this helps you identify the correct category and choose appropriate suppression methods, such as dry chemical, foam, or CO2, while being cautious with water, which can spread flammable liquids or worsen the fire in many cases.

Class B fires involve flammable liquids, which are liquids with low flash points that emit ignitable vapors. Examples include gasoline, solvents, mineral spirits, paints thinner, and certain oils. These fires are defined by the fuel being a liquid that can produce vapors capable of ignition, unlike other classes that involve different forms of fuel: ordinary combustibles like wood and paper for Class A, energized electrical equipment for Class C, and reactive metals for Class D. Knowing this helps you identify the correct category and choose appropriate suppression methods, such as dry chemical, foam, or CO2, while being cautious with water, which can spread flammable liquids or worsen the fire in many cases.