Class A Foam; Class B Foam - Task Force Tips MASTER FOAM Series Instructions For Safe Operation And Maintenance

4.2.1 CLASS A FOAM

It is recommend that the Class A foam used meets USDA Forest Service 5100-307A "Specifi cation for Fire Suppressant Foam for
Wildland Firefi ghting (Class A Foam)", NFPA 298 "Fire Fighting Foam Chemicals for Class A Fuels in Rural, Suburban, and Vegetated
Areas", or NFPA 1150 "Foam Chemicals for Fires in Class A Fuels".
Apply with low expansion nozzle for:
Apply with medium expansion nozzle for:

4.2.2 CLASS B FOAM

HYDROCARBONS
Fuels that are mostly distilled from crude oil or
vegetable matter. Will not mix with water.
AFFF (Aqueous Film Forming Foam)
AR (Alcohol Resistant Foam)
UNIGNITED
May apply at less than rates for
ignited. Be capable of increasing
to ignited rates if needed.
MEDIUM EXPANSION NOZZLE
for vapor suppression
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SOLID FUEL - CLASS A
MOP UP & OVERHAUL
OPERATIONS
- soaking and penetration of fuel
- greater stream reach
- greater coverage
- longer lasting
- insulating
LIQUID FUEL - CLASS B
Apply with
CLASS A FOAM
WILDLAND &
EXPOSURE PROTECTION
Apply as needed for penetration, isolation,
cooling, and smothering.
straight stream nozzle
low expansion nozzle
piercing nozzle
medium expansion nozzle
A fl ammable liquid that mixes with water.
Examples are alcohol's, amines, ethers, esters,
aldehydes, and ketones. In fi refi ghting, any
fl ammable liquid which destroys regular foam is
generally referred to as a polar solvent.
AR (Alcohol Resistant Foam)
Application rates:
MEDIUM EXPANSION NOZZLE
10
POLAR SOLVENTS
UNIGNITED
Use foam manufacturer's
recommendations for
handheld nozzles.
Apply with
for vapor suppression
LIZ-030 March 8, 2018 Rev12