Fire Class A, Involve ordinary solid combustible materials (Wood, paper, plastics, cloth, natural vegetation, etc)Involve flammable or combustible liquids (gasoline, kerosene, diesel fuel, etc), Fire Class B, Involve flammable or combustible liquids (gasoline, kerosene, diesel fuel, etc), Fire Class C, Involve energized electrical equipment, Fire Class D, Involve combustible metals, Fire Class K, Involve combustible cooking oils and fats, Fire Development - Incipient/Ignition, Incipient occurs when there is an adequate supply of fuel, oxygen, and heat. Ignition is defined as the action of setting something on fire., Fire Development - Growth, A fire in the growth stage produces more interaction and is more dependent on the environment, Fire Development - Fully Developed, When the fire is consuming the maximum amount of fuel possible and is achieving the maximum HRR possible for the fuel supply and oxygen present, Fire Development - Decay, This condition can occur because of a decreasing fuel or oxygen supply, Fire Development - Thermal Layering, The phenomenon of gases forming into layers according to temperature. As the fire grows, more hot gases are produced. Hot gases are lighter and buoyant and tend to seek a higher level in the compartment. The cooler gases are heavier and tend to occur at lower levels in the compartment., Fire Development - Roll-over, Is the spontaneous ignition of hot gases in the upper levels of a room or compartment, Fire Development - Flashover, Not a specific moment but rather the transition from a fire that is growing by igniting one type of fuel to another. It is a rapid change or transition from the growth stage to the fully developed stage., Fire Development - Backdraft, Caused by the introduction of oxygen in an environment where the superheated gases and contents are already hot enough for combustion but do not have sufficient oxygen to combust. It results in a sudden and explosive combustion., Fire Development - Rapid Fire Growth, Introducing air into a ventilation-limited fire can result in explosive rapid fire growth, Hazard Class 1, Explosives, Hazard Class 2, Gases, Hazard Class 3, Flammable liquids, Hazard Class 4, Flammable solids; substances liable to spontaneous combustion; substances which, on contact with water, emit flammable gases, Hazard Class 5, Oxidizing substances and organic peroxides, Hazard Class 6, Toxic substances and infectious substances, Hazard Class 7 , Radioactive materials, Hazard Class 8, Corrosive substances, Hazard Class 9, Miscellaneous hazardous materials/dangerous goods and articles.

Fire Classes/Fire Development/Hazard Classification

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