Fire Classes

Question 1

Class A

Answer 1

Ordinary combustibles:

wood, cloth, rubber and some plastics

Extinguish with water.

Question 2

Class B

Answer 2

Flammable Liquids and Gases

Extinguish with dry chemicals, halogenated suppressants (FM 200), or foam. Halon is no longer recommended due to ozone depletion.

Question 3

Class C

Answer 3

Energized electrical equipment

Extinguish by shutting off electricity then dry chemicals or carbon dioxide. Wet products, including foam can conduct electricity.

Question 4

Class D

Answer 4

Combustible metals:

sodium, titanium, magnesium, potassium, uranium, lithium, plutonium, and calcium.

Extinguish with dry powders, most commonly sodium chloride granules and graphite powder.

Water can excite combustible metals and cause the fire to spread.

Question 5

Class K

Answer 5

Cooking oils and fats

Extinguish with dry-powder (not the same as dry chemical) or carbon dioxide.

Saponification can also be used.