


Carbon Dioxide Extinguishers
The Carbon Dioxide (CO2) extinguisher is recommended for use in electronic environments and is suitable for Class 'E' electrical hazard fires. Carbon Dioxide fire extinguishers also have limited capabilities for extinguishing small, indoor Class 'B' flammable liquid and class 'A' fires. Available in three sizes.
Wet Chemical Extinguishers
Wet Chemical extinguishers utilise an aqueous solution
discharged in a fine spray to the surface of Class F fires.
The agent reacts with
the burning oil, or fat, forming a ‘blanket' which extinguishes the flame by creating
a saionifying action and changing the burning liquid into a soap like substance.
Once used, as the solution is usually alkaline, it is recommended the surface be
cleaned and all residue removed within a reasonable time period.
Dry Chemical Powder Extinguishers
Dry Chemical Powder fire extinguishers (DCP's) are
the most widely used fire extinguishers, suitable for use on many types of fires.
The compact nature of these fire extinguishers, ranging from the 0.9kg domestic model
up to the 9kg industrial model, enables them to be utilised in numerous applications.
Foam Extinguishers
These extinguishers contain a concentrate mixed with water, which
produces foam when discharged. Foam extinguishers are effective against Class A &
B fires involving paper, textiles, wood, plastics, rubber, petrol, oil and paints.
The foam provides a blanket covering when utilised on flammable liquid or carbonaceous
fires assisting with the exclusion of oxygen and thus reducing the ability of fuel
to continue burning.
Water Extinguishers
A very efficient and cost effective method to combat certain types
of fires, the normal capacity of this type of fire extinguisher is 9 litres. Water
acts to reduce the temperature of the burning fuel so it is below its ignition point.
Water extinguishers are efficient and cost effective against Class A fires involving paper, textiles, wood, plastics and rubber.
Water acts to reduce the fuel, which is burning, to below the ignition temperature. Fire extinguisher identification and location signs are also available.
Fire Extinguisher Selection and Utility
Fire extinguishers generally are designed for one or more classes. Commonly available are A (water), BC (carbon dioxide), and ABC (dry powder).
The Australian markings are:
|
Type |
pre-1997 |
current |
|
Water |
Solid red | |
|
Foam |
Solid blue |
Red with a blue band |
|
Powder |
Red with a white band | |
|
Carbon dioxide |
Red with a black band | |
|
Vapourising liquid (non halon) |
Red with a yellow band | |
|
Halon |
Solid yellow |
|
|
Wet chemical |
Solid oatmeal |
Red with an oatmeal band |




