©Copyright Task Force Tips, Inc. 2004 - 2017 LIU-330 November 16, 2017 Rev08
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4.1 CLASS A FOAM
SOLID FUEL - CLASS A
CLASS A FOAM
Recommended using Class A foam that meets USDA Forest Service “Interim Requirements for Foam for Wildland Fires,
Aircraft or Ground Application” or NFPA 298 “Foam Chemicals for Wildland Fire Control.”
MOP UP & OVERHAUL
OPERATIONS
WILDLAND &
EXPOSURE PROTECTION
Apply as needed for penetration, isolation,
cooling, and smothering.
Apply with low expansion nozzle for: straight stream nozzle
- soaking and penetration of fuel low expansion nozzle
- greater stream reach piercing nozzle
Apply with medium expansion nozzle for: medium expansion nozzle
- greater coverage
- longer lasting
- insulating
4.2 CLASS B FOAM
LIQUID FUEL - CLASS B
HYDROCARBONS
Fuels that are mostly distilled from crude oil or
vegetable matter. Will not mix with water.
POLAR SOLVENTS
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.
AFFF (Aqueous Film Forming Foam)
AR (Alcohol Resistant Foam)
AR (Alcohol Resistant Foam)
UNIGNITED UNIGNITED
May apply at less than rates for
ignited. Be capable of increasing
to ignited rates if needed.
Application rates:
Use foam manufacturer’s
recommendations for
handheld nozzles.
Apply with
MEDIUM EXPANSION NOZZLE
for vapor suppression
Apply with
MEDIUM EXPANSION NOZZLE
for vapor suppression
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