2
© 2011, Safe Workplace Promotion Services Ontario,
publicly known as Workplace Safety & Prevention Services.
1 877 494 WSPS (9777) | 905 614 1400 | www.wsps.ca
Fire Extinguishers
Figure 1: Matching Classes of Fire and Types of Extinguishers
Fuel Sources Class of Fire Type of Extinguisher (Extinguishing Agent)
Ordinary combustibles
(e.g., trash, wood, paper, cloth)
A Water; chemical foam; dry chemical
1
Flammable liquids
(e.g., oils, grease, tar, gasoline,
paints, thinners)
B
Carbon dioxide (CO2); halon
2
; dry chemical;
aqueous film forming foam (AFFF)
Electricity
(e.g., live electrical equipment)
C CO2; halon; dry chemical
Combustible metals
(e.g., magnesium, titanium)
D
Dry powder (suitable for the specific combustible
metal involved)
1
Dry chemicals, CO2 and halon can be used on Class A fires, but may not be effective on their own. They may need
to be supplemented with water.
2
Halon extinguishers are no longer made, but some may still be in use. Dangerous gases are formed when halon is
used to put out fires. Wear proper respiratory equipment, particularly in enclosed spaces. After use, do not allow
anyone to enter the area until it has been well ventilated.
Figure 2: Specific Types of Fire Extinguishers and their Uses
Water
Pressurized, pump type
Cools fire
Use on Class A fires
Do not use on B or C fires
Multi Purpose Dry Chemical
Stored pressure type
Smothers fire with layer of powder
Use on Class A, B and C fires
Chemical Foam
Aqueous film forming foam (AFFF) type
Smothers fire with foam
Use on Class A and B fires
Compressed Gas
Halon, CO2 types
Smothers fire with gas
Use on Class B and C fires
