Safety Information

Fire Extinguisher Basics

 

 

 

 

 

 

 

 

 

The fire triangle or combustion triangle is a simple model for understanding the ingredients necessary for most fires.

The triangle illustrates a fire requires three elements: heat, fuel, and an oxidizing agent (usually oxygen). The fire is prevented or extinguished by removing any one of them. A fire naturally occurs when the elements are combined in the right mixture.

The fire tetrahedron is an addition to the fire triangle. It adds the requirement for the presence of the chemical reaction which is the process of fire. For example, the suppression effect of Halon is due to its interference in the fire chemical inhibition.

Every extinguisher should display one or more of the fire class symbols on its label. Each symbol indicates a type of fire (fuel) on which the extinguisher may be safely and effectively used. A red slash through any of the fire symbols means you must NOT use the extinguisher on that class of fire.

Class A: Wood, Paper & Plastic

Fires can involve any material that has a burning ember or leaves an ash such as wood, paper, cloth, rubber, many plastics, etc.

fire and safety services

Class B: Flammable & Combustible Liquids

Fires involve flammable liquids and petroleum gases such as motor oil, paint thinner, dry cleaning agents, etc. Flammable liquids do not ignite in the liquid state but rather it is the vapours being generated by these liquids that ignite.

Class C: Flammable Gases

Fires involve flammable gases such as “LPG” Liquid Petroleum Fuels, Propane, etc.

Class D: Flammable Metals

Fires involve exotic metals such as sodium, magnesium, and titanium. These fires require specials agents and special application techniques different from agents and techniques used on Class “A”, “B”, or “E” fires. Some agents like water will actually react to burning metals and increase the intensity of the fire in a violent manner.

class e fire symbol

Class E: Electrical 

Fires involve live electrical equipment and require the use of an extinguishing agent and/or extinguisher that will not conduct electricity.

Class F: Cooking Oils & Fats

Fires involve combustible cooking media such as vegetable or animal oils and fats. These fires require wet chemical extinguishers that have superior cooling capabilities to lower the temperature of the cooking medium below its auto ignition point.

Download Our Fire Extinguisher Selection Chart 

fire extinguisher testing

FSS Fire Extinguisher Selection Chart

Fire Extinguisher Basics

Fire Extinguisher Basics

 

 

 

 

 

 

 

 

 

The fire triangle or combustion triangle is a simple model for understanding the ingredients necessary for most fires.

The triangle illustrates a fire requires three elements: heat, fuel, and an oxidizing agent (usually oxygen). The fire is prevented or extinguished by removing any one of them. A fire naturally occurs when the elements are combined in the right mixture.

The fire tetrahedron is an addition to the fire triangle. It adds the requirement for the presence of the chemical reaction which is the process of fire. For example, the suppression effect of Halon is due to its interference in the fire chemical inhibition.

Every extinguisher should display one or more of the fire class symbols on its label. Each symbol indicates a type of fire (fuel) on which the extinguisher may be safely and effectively used. A red slash through any of the fire symbols means you must NOT use the extinguisher on that class of fire.

Class A: Wood, Paper & Plastic

Fires can involve any material that has a burning ember or leaves an ash such as wood, paper, cloth, rubber, many plastics, etc.

fire and safety services

Class B: Flammable & Combustible Liquids

Fires involve flammable liquids and petroleum gases such as motor oil, paint thinner, dry cleaning agents, etc. Flammable liquids do not ignite in the liquid state but rather it is the vapours being generated by these liquids that ignite.

Class C: Flammable Gases

Fires involve flammable gases such as “LPG” Liquid Petroleum Fuels, Propane, etc.

Class D: Flammable Metals

Fires involve exotic metals such as sodium, magnesium, and titanium. These fires require specials agents and special application techniques different from agents and techniques used on Class “A”, “B”, or “E” fires. Some agents like water will actually react to burning metals and increase the intensity of the fire in a violent manner.

class e fire symbol

Class E: Electrical 

Fires involve live electrical equipment and require the use of an extinguishing agent and/or extinguisher that will not conduct electricity.

Class F: Cooking Oils & Fats

Fires involve combustible cooking media such as vegetable or animal oils and fats. These fires require wet chemical extinguishers that have superior cooling capabilities to lower the temperature of the cooking medium below its auto ignition point.

Download Our Fire Extinguisher Selection Chart 

fire extinguisher testing

FSS Fire Extinguisher Selection Chart

Fire Safety Equipment
Fire Safety Maintenance
Residential Fire Safety
Bushfire Safety
Workplace Fire Safety
Gas Cylinder Safety
Emergency Showers & Eye Wash Stations

Needing help with your Fire & Safety requirements?
Book your next Fire & Safety service with Fire System Services.
CONTACT US NOW