Class A fires
ordinary combustible materials,
such as wood, cloth, paper, upholstery materials, and
so forth
Class B fires
flammable petroleum products
or other flammable or combustible liquids, greases,
solvents, paints, and so forth.
Class C fires
energized electrical wiring and
equipment
Class D fire
involves flammable
metal
Water extinguishers
Best type to use on class A fires.
Not recommended for class B. Extreme caution with class C. Never use with class D.
CO2
Used for class A, B, and C fires.
Never use with class D.
Halogenated Hydrocarbon
Class notes state most effective C+D
Text state most effective on class B and C fires.
Can be used on class A and D, but are less effective.
Halon 104 is not approved for any fire extinguishing use. Disposed according with EPA.
Halon 1001 is corrosive, not recommended for aircraft use.
Halon 1011 not recommended for aircraft use.
Halon 1202 not recommended for aircraft use.
Halon 1211 is NONCORROSIVE. Acts rapidly on fires. Interferes chemically. Outstanding properties in preventing reflash after the fire has been extinguished.
Halon 1301 has same properties of Halon 1211. Halon 1301 has a vapor spray that is more difficult to direct.
Dry powder
Best used on class D fires.
Effective on class B and C.
Multipurpose Dry Chemical
Class A, B, C fires
Do not use on class D.
Purple K
Can put on any. Very corrosive, can destroy engine.
Maintenance
Maintenance = Potential for a fire to occur.
1.Fuel
2. Heat ignition
3. Oxygen. Normally 21%. Minimum 16% to burn.
Hazmat
deemed by DOT.
Hazardous substance
deemed by EPA.
Hazwaste
Hazardous waste is used or expire hazmat that is ready for proper disposal.
Hazcom
Hazardous communication. SDS, labels, safety diamond…
NIOSH
National Institute of Occupational Safety and Health: Responsible for conducting research and making recommendations.
A short to ground
more current flow and greater heat.
